Host: Are there really three hours of questions? Are you fucking serious? You don't think there's a lot to talk about, Elon? Holy fuck man. It's the most interesting point. All the storylines are converging right now. We'll see how much we can get through.

Elon Musk: It's almost like I planned it.

Host: Exactly. We'll get to that.

Elon Musk: But I would never do such a thing… As you know better than anybody else, only 10-15% of the total cost of ownership of a data center is energy. That's the part you're presumably saving by moving this into space. Most of it's the GPUs. If they're in space, it's harder to service them or you can't service them. So the depreciation cycle goes down on them. It's just way more expensive to have the GPUs in space, presumably. What's the reason to put them in space?

Elon Musk: The availability of energy is the issue. If you look at electrical output outside of China, everywhere outside of China, it's more or less flat. It’s maybe a slight increase, but pretty close flat. China has a rapid increase in electrical output. But if you're putting data centers anywhere except China, where are you going to get your electricity? Especially as you scale. The output of chips is growing pretty much exponentially, but the output of electricity is flat. So how are you going to turn the chips on? Magical power sources? Magical electricity fairies?

Host: You're famously a big fan of solar.

Elon Musk: One terawatt of solar power, with a 25% capacity factor, that’s like four terawatts of solar panels. It's 1% of the land area of the United States. We’re in the singularity when we’ve got one terawatt of data centers, right?

Host: So what are you running out of exactly? How far into the singularity are you though?

Elon Musk: You tell me.

Host: Exactly. So I think we'll find we're in the singularity and it’ll be like, "Okay, we’ve still got a long way to go." But is the plan to put it in space after we've covered Nevada in solar panels?

Elon Musk: I think it's pretty hard to cover Nevada in solar panels. You have to get permits. Try getting the permits for that. See what happens. So space is really a regulatory play. It's harder to build on land than it is in space. It's harder to scale on the ground than it is to scale in space. You're also going to get about five times the effectiveness of solar panels in space versus the ground, and you don't need batteries.

Elon Musk: I almost wore my other shirt, which says, "it's always sunny in space". Which it is because you don't have a day-night cycle, seasonality, clouds, or an atmosphere in space. The atmosphere alone results in about a 30% loss of energy. So any given solar panel can do about five times more power in space than on the ground. You also avoid the cost of having batteries to carry you through the night. It's actually much cheaper to do in space. My prediction is that it will be by far the cheapest place to put AI. It will be space in 36 months or less. Maybe 30 months.

Host: 36 months?

Elon Musk: Less than 36 months.

Host: How do you service GPUs as they fail, which happens quite often in training?

Elon Musk: Actually, it depends on how recent the GPUs are that have arrived. At this point, we find our GPUs to be quite reliable. There's infant mortality, which you can obviously iron out on the ground. So you can just run them on the ground and confirm that you don't have infant mortality with the GPUs. But once they start working and you're past the initial debug cycle of Nvidia or whoever's making the chips—could be Tesla AI6 chips or something like that, or it could be TPUs or Trainiums or whatever—they’re quite reliable past a certain point. So I don't think the servicing thing is an issue. But you can mark my words. In 36 months, but probably closer to 30 months, the most economically compelling place to put AI will be space. It will then get ridiculously better to be in space. The only place you can really scale is space. Once you start thinking in terms of what percentage of the Sun's power you are harnessing, you realize you have to go to space. You can't scale very much on Earth.

Host: But by very much, to be clear, you're talking terawatts?

Elon Musk: Yeah. All of the United States currently uses only half a terawatt on average. So if you say a terawatt, that would be twice as much electricity as the United States currently consumes. So that's quite a lot. Can you imagine building that many data centers, that many power plants? Those who have lived in software land don't realize they're about to have a hard lesson in hardware. It's actually very difficult to build power plants. You don't just need power plants, you need all of the electrical equipment. You need the electrical transformers to run the AI transformers. Now, the utility industry is a very slow industry. They pretty much impedance match to the government, to the Public Utility Commissions. They impedance match literally and figuratively. They're very slow, because their past has been very slow. So trying to get them to move fast is...

Host: Have you ever tried to do an interconnect agreement with a utility at scale, with a lot of power?

Elon Musk: As a professional podcaster, I can say that I have not, in fact.

Host: They need many more views before that becomes an issue. They have to do a study for a year. A year later, they'll come back to you with their interconnect study. Can't you solve this with your own behind the meter power stuff?

Elon Musk: You can build power plants. That's what we did at xAI, for Colossus 2.

Host: So why talk about the grid? Why not just build GPUs and power co-located?

Elon Musk: That's what we did.

Host: But I'm saying why isn't this a generalized solution? Where do you get the power plants from?

Elon Musk: When you're talking about all the issues working with utilities, you can just build private power plants with the data centers.

Host: Right. But it begs the question of where do you get the power plants from? The power plant makers.

Elon Musk: Oh, I see what you're saying.

Host: Is this the gas turbine backlog basically?

Elon Musk: Yes. You can drill down to a level further. It's the vanes and blades in the turbines that are the limiting factor because it’s a very specialized process to cast the blades and vanes in the turbines, assuming you’re using gas power. It's very difficult to scale other forms of power. You can potentially scale solar, but the tariffs currently for importing solar in the US are gigantic and the domestic solar production is pitiful.

Host: Why not make solar? That seems like a good Elon-shaped problem.

Elon Musk: We are going to make solar.

Host: Okay.

Elon Musk: Both SpaceX and Tesla are building towards 100 gigawatts a year of solar cell production.

Host: How low down the stack? From polysilicon up to the wafer to the final panel?

Elon Musk: I think you've got to do the whole thing from raw materials to finish the cell. Now, if it's going to space, it costs less and it's easier to make solar cells that go to space because they don't need much glass. They don't need heavy framing because they don't have to survive weather events. There's no weather in space. So it's actually a cheaper solar cell that goes to space than the one on the ground.

Host: Is there a path to getting them as cheap as you need in the next 36 months?

Elon Musk: Solar cells are already very cheap. They're farcically cheap. I think solar cells in China are around $0.25-30/watt or something like that. It's absurdly cheap. Now put it in space, and it's five times cheaper. In fact, it's not five times cheaper, it's 10 times cheaper because you don't need any batteries. So the moment your cost of access to space becomes low, by far the cheapest and most scalable way to generate tokens is space. It's not even close. It'll be an order of magnitude easier to scale. The point is you won't be able to scale on the ground. You just won't. People are going to hit the wall big time on power generation. They already are. The number of miracles in series that the xAI team had to accomplish in order to get a gigawatt of power online was crazy.

Elon Musk: We had to gang together a whole bunch of turbines. We then had permit issues in Tennessee and had to go across the border to Mississippi, which is fortunately only a few miles away. But we still then had to run the high power lines a few miles and build the power plant in Mississippi. It was very difficult to build that. People don't understand how much electricity you actually need at the generation level in order to power a data center. Because the noobs will look at the power consumption of, say a GB300, and multiply that by a thing and then think that's the amount of power you need. All the cooling and everything. Wake up. That's a total noob, you’ve never done any hardware in your life before. Besides the GB300, you've got to power all of the networking hardware. There's a whole bunch of CPU and storage stuff that's happening. You've got to size for your peak cooling requirements. That means, can you cool even on the worst hour of the worst day of the year? It gets pretty frigging hot in Memphis. So you're going to have a 40% increase on your power just for cooling. That’s assuming you don't want your data center to turn off on hot days and you want to keep going. There's another multiplicative element on top of that which is, are you assuming that you never have any hiccups in your power generation?

Elon Musk: Actually, sometimes we have to take the generators, some of the power, offline in order to service it. Okay, now you add another 20-25% multiplier on that, because you've got to assume that you've got to take power offline to service it. So our actual estimate: every 110,000 GB300s—inclusive of networking, CPU, storage, cooling, margin for servicing power—is roughly 300 megawatts.

Host: Sorry, say that again.

Elon Musk: What you probably need at the generation level to service 330,000 GB 300s—including all of the associated support networking and everything else, and the peak cooling, and to have some power margin reserve—is roughly a gigawatt.

Host: Can I ask a very naive question? You're describing the engineering details of doing this stuff on Earth. But then there's analogous engineering difficulties of doing it in space. How do you replace infinite bandwidth with orbital lasers, et cetera, et cetera? How do you make it resistant to radiation? I don't know the details of the engineering, but fundamentally, what is the reason to think those challenges which have never had to be addressed before will end up being easier than just building more turbines on Earth? There are companies that build turbines on Earth. They can make more turbines, right?

Elon Musk: Again, try doing it and then you'll see. The turbines are sold out through 2030.

Host: Have you guys considered making your own?

Elon Musk: In order to bring enough power online, I think SpaceX and Tesla will probably have to make the turbine blades, the vanes and blades, internally.

Host: But just the blades or the turbines?

Elon Musk: The limiting factor... you can get everything except the blades. They call them blades and vanes. You can get that 12 to 18 months before the vanes and blades. The limiting factor is the vanes and blades. There are only three casting companies in the world that make these, and they're massively backlogged.

Host: Is this Siemens, GE, those guys, or is it a sub company?

Elon Musk: No, it's other companies. Sometimes they have a little bit of casting capability in-house. But I'm just saying you can just call any of the turbine makers and they will tell you. It's not top secret. It’s probably on the internet right now.

Host: If it wasn't for the tariffs, would Colossus be solar-powered?

Elon Musk: It would be much easier to make it solar powered, yeah. The tariffs are nuts, several hundred percent.

Host: Don't you know some people?

Elon Musk: The president has... we don't agree on everything and this administration is not the biggest fan of solar. We also need the land, the permits, and everything. So if you try to move very fast, I do think scaling solar on Earth is a good way to go, but you do need some amount of time to find the land, get the permits, get the solar, pair that with the batteries.

Host: Why would it not work to stand up your own solar production? You're right that you eventually run out of land, but there's a lot of land here in Texas. There's a lot of land in Nevada, including private land. It's not all publicly-owned land. So you'd be able to at least get the next Colossus and the next one after that. At a certain point, you hit a wall. But wouldn't that work for the moment?

Elon Musk: As I said, we are scaling solar production. There's a rate at which you can scale physical production of solar cells. We're going as fast as possible in scaling domestic production.

Host: You're making the solar cells at Tesla?

Elon Musk: Both Tesla and SpaceX have a mandate to get to 100 gigawatts a year of solar.

Host: Speaking of the annual capacity, I'm curious, in five years time let's say, what will the installed capacity be on Earth…?

Elon Musk: Five years is a long time.

Host: And in space? I deliberately pick five years because it's after your "once we're up and running" threshold. So in five years time what's the on-Earth versus in-space installed AI capacity?

Elon Musk: If you say five years from now, I think probably AI in space will be launching every year the sum total of all AI on Earth. Meaning, five years from now, my prediction is we will launch and be operating every year more AI in space than the cumulative total on Earth.

Host: Which is...

Elon Musk: I would expect it to be at least, five years from now, a few hundred gigawatts per year of AI in space and rising. I think you can get to around a terawatt a year of AI in space before you start having fuel supply challenges for the rocket.

Host: Okay, but you think you can get hundreds of gigawatts per year in five years time?

Elon Musk: Yes.

Host: So 100 gigawatts, depending on the specific power of the whole system with solar arrays and radiators and everything, is on the order of 10,000 Starship launches.

Elon Musk: Yes.

Host: You want to do that in one year. So that's like one Starship launch every hour. That's happening in this city? Walk me through a world where there's a Starship launch every single hour.

Elon Musk: I mean, that's actually a lower rate compared to airlines, aircraft.

Host: There's a lot of airports.

Elon Musk: A lot of airports.

Host: And you’ve got to launch into the polar orbit.

Elon Musk: No, it doesn't have to be polar. There's some value to sun-synchronous, but I think actually, if you just go high enough, you start getting out of Earth's shadow.

Host: How many physical Starships are needed to do 10,000 launches a year?

Elon Musk: I don't think we'll need more than... You could probably do it with as few as 20 or 30. It really depends on how quickly… The ship has to go around the Earth and the ground track for the ship has to come back over the launch pad. So if you can use a ship every, say 30 hours, you could do it with 30 ships. But we'll make more ships than that. SpaceX is gearing up to do 10,000 launches a year, and maybe even 20 or 30,000 launches a year.

Host: Is the idea to become basically a hyperscaler, become an Oracle, and lend this capacity to other people?

Elon Musk: Presumably, SpaceX is the one launching all this. So, SpaceX is going to become a hyperscaler?

Elon Musk: Hyper-hyper. If some of my predictions come true, SpaceX will launch more AI than the cumulative amount on Earth of everything else combined.

Host: Is this mostly inference or?

Elon Musk: Most AI will be inference. Already, inference for the purpose of training is most training.

Host: There's a narrative that the change in discussion around a SpaceX IPO is because previously SpaceX was very capital efficient. It wasn't that expensive to develop. Even though it sounds expensive, it's actually very capital efficient in how it runs. Whereas now you're going to need more capital than just can be raised in the private markets. The private markets can accommodate raises of—as we've seen from the AI labs—tens of billions of dollars, but not beyond that. Is it that you'll just need more than tens of billions of dollars per year? That's why you'd take it public?

Elon Musk: I have to be careful about saying things about companies that might go public.

Host: That’s never been a problem for you, Elon.

Elon Musk: There's a price to pay for these things. Make some general statements for us about the depth of the capital markets between public and private markets.

Elon Musk: There's a lot more capital available...

Host: Very general.

Elon Musk: There's obviously a lot more capital available in the public markets than private. It might be 100x more capital, but it's way more than 10x.

Host: Isn't it also the case that with things that tend to be very capital intensive—if you look at, say, real estate as a huge industry, that raises a lot of money each year at an industry level—they tend to be debt financed because by the time you're deploying that much money, you actually have a pretty—

Elon Musk: You have a clear revenue stream.

Host: Exactly, and a near-term return. You see this even with the data center build-outs, which are famously being financed by the private credit industry. Why not just debt finance?

Elon Musk: Speed is important. I'm generally going to do the thing that... I just repeatedly tackle the limiting factor. Whatever the limiting factor is on speed, I'm going to tackle that. If capital is the limiting factor, then I'll solve for capital. If it's not the limiting factor, I'll solve for something else.

Host: Based on your statements about Tesla and being public, I wouldn't have guessed that you thought the way to move fast is to be public.

Elon Musk: Normally, I would say that's true. Like I said, I'd like to talk about it in some more detail, but the problem is if you talk about public companies before they become public, you get into trouble, and then you have to delay your offering.

Host: And as you said, you’re solving for speed.

Elon Musk: Yes, exactly. You can't hype companies that might go public. So that's why we have to be a little careful here. But we can talk about physics.

Elon Musk: The way you think about scaling long-term is that Earth only receives about half a billionth of the Sun's energy. The Sun is essentially all the energy. This is a very important point to appreciate because sometimes people will talk about modular nuclear reactors or various fusion on Earth. But you have to step back a second and say, if you're going to climb the Kardashev scale and harness some nontrivial percentage of the sun's energy… Let's say you wanted to harness a millionth of the sun's energy, which sounds pretty small. That would be about, call it roughly, 100,000x more electricity than we currently generate on Earth for all of civilization. Give or take an order of magnitude. Obviously, the only way to scale is to go to space with solar. Launching from Earth, you can get to about a terawatt per year. Beyond that, you want to launch from the moon. You want to have a mass driver on the moon. With that mass driver on the moon, you could do probably a petawatt per year. We're talking these kinds of numbers, terawatts of compute.

Host: Presumably, whether you're talking about land or space, far, far before this point, you run into... Maybe the solar panels are more efficient, but you still need the chips. You still need the logic and the memory and so forth. You're going to need to build a lot more chips and make them much cheaper. Right now the world has maybe 20-25 gigawatts of compute. How are we getting a terawatt of logic by 2030?

Elon Musk: I guess we're going to need some very big chip fabs.

Host: Tell me about it.

Elon Musk: I've mentioned publicly the idea of doing a sort of a TeraFab, Tera being the new Giga. I feel like the naming scheme of Tesla, which has been very catchy, is you looking at the metric scale. At what level of the stack are you? Are you building the clean room and then partnering with an existing fab to get the process technology and buying the tools from them? What is the plan there?

Elon Musk: Well, you can't partner with existing fabs because they can't output enough. The chip volume is too low.

Host: But for the process technology?

Elon Musk: Partner for the IP.

Elon Musk: The fabs today all basically use machines from like five companies. So you've got ASML, Tokyo Electron, KLA-Tencor, et cetera. So at first, I think you'd have to get equipment from them and then modify it or work with them to increase the volume. But I think you'd have to build perhaps in a different way. The logical thing to do is to use conventional equipment in an unconventional way to get to scale, and then start modifying the equipment to increase the rate.

Host: Boring Company-style.

Elon Musk: Yeah. You sort of buy an existing boring machine and then figure out how to dig tunnels in the first place and then design a much better machine that's some orders of magnitude faster.

Elon Musk: Here's a very simple lens. We can categorize technologies and how hard they are. One categorization could be to look at things that China has not succeeded in doing. If you look at Chinese manufacturing, they’re still behind on leading-edge chips and still behind on leading-edge turbine engines and things like that.

Host: So does the fact that China has not successfully replicated TSMC give you any pause about the difficulty? Or do you think that's not true for some reason?

Elon Musk: It's not that they have not replicated TSMC, they have not replicated ASML. That's the limiting factor.

Host: So you think it's just the sanctions, essentially?

Elon Musk: Yeah, China would be outputting vast numbers of chips if they could buy 2-3 nanometers.

Host: But couldn't they up to relatively recently buy them?

Elon Musk: No.

Host: Okay.

Elon Musk: The ASML ban has been in place for a while. But I think China's going to be making pretty compelling chips in three or four years.

Host: Would you consider making the ASML machines?

Elon Musk: "I don't know yet" is the right answer. To reach a large volume in, say, 36 months, to match the rocket payload to orbit… If we're doing a million tons to orbit in, let's say three or four years from now, something like that… We're doing 100 kilowatts per ton. So that means we need at least 100 gigawatts per year of solar. We'll need an equivalent amount of chips. You need 100 gigawatts worth of chips. You've got to match these things: the mass to orbit, the power generation, and the chips. I'd say my biggest concern actually is memory. The path to creating logic chips is more obvious than the path to having sufficient memory to support logic chips. That's why you see DDR prices going ballistic and these memes. You're marooned on a desert island. You write "Help me" on the sand. Nobody comes. You write "DDR RAM." Ships come swarming in.

Host: I'd love to hear your manufacturing philosophy around fabs. I know nothing about the topic.

Elon Musk: I don't know how to build a fab yet. I'll figure it out. Obviously, I've never built a fab.

Host: It sounds like you think the process knowledge of these 10,000 PhDs in Taiwan who know exactly what gas goes in the plasma chamber and what settings to put on the tool, you can just delete those steps. Fundamentally, it's about getting the clean room, getting the tools, and figuring it out.

Elon Musk: I don't think it's PhDs. It's mostly people who are not PhDs. Most engineering is done by people who don't have PhDs. Do you guys have PhDs?

Host: No.

Elon Musk: Okay.

Host: We also haven't successfully built any fabs, so you shouldn't be coming to us for fab advice.

Elon Musk: I don't think you need PhDs for that stuff. But you do need competent personnel. Right now, Tesla is pedal to the metal, max production of going as fast as possible to get Tesla AI5 chip design into production and then reaching scale. That'll probably happen around the second quarter-ish of next year, hopefully. AI6 would hopefully follow less than a year later. We've secured all the chip fab production that we can.

Host: Yes. But you're currently limited on TSMC fab capacity.

Elon Musk: Yeah. We'll be using TSMC Taiwan, Samsung Korea, TSMC Arizona, Samsung Texas. And we still—

Host: You've booked out all the capacity.

Elon Musk: Yes. I ask TSMC or Samsung, "okay, what's the timeframe to get to volume production?" The point is, you've got to build the fab and you've got to start production, then you've got to climb the yield curve and reach volume production at high yield. That, from start to finish, is a five-year period. So the limiting factor is chips. The limiting factor once you can get to space is chips, but the limiting factor before you can get to space is power.

Host: Why don't you do the Jensen thing and just prepay TSMC to build more fabs for you?

Elon Musk: I've already told them that.

Host: But they won't take your money? What's going on?

Elon Musk: They're building fabs as fast as they can. So is Samsung. They're pedal to the metal. They're going balls to the wall, as fast as they can. It’s still not fast enough. Like I said, I think towards the end of this year, chip production will probably outpace the ability to turn chips on. But once you can get to space and unlock the power constraint, you can now do hundreds of gigawatts per year of power in space. Again, bearing in mind that average power usage in the US is 500 gigawatts. So if you're launching, say 200 gigawatts, a year to space, you're sort of lapping the US every two and a half years. All US electricity production, this is a very huge amount. Between now and then, the constraint for server-side compute, concentrated compute, will be electricity. My guess is that people start getting to the point where they can't turn the chips on for large clusters towards the end of this year. The chips are going to be piling up and won't be able to be turned on.

Elon Musk: Now for edge compute it’s a different story. For Tesla, the AI5 chip is going into our Optimus robot. If you have AI edge compute, that's distributed power. Now the power is distributed over a large area. It's not concentrated. If you can charge at night, you can actually use the grid much more effectively. Because the actual peak power production in the US is over 1,000 gigawatts. But the average power usage, because the day-night cycle, is 500. So if you can charge at night, there's an incremental 500 gigawatts that you can generate at night. So that's why Tesla, for edge compute, is not constrained. We can make a lot of chips to make a very large number of robots and cars. But if you try to concentrate that compute, you're going to have a lot of trouble turning it on.

Host: What I find remarkable about the SpaceX business is the end goal is to get to Mars, but you keep finding ways on the way there to keep generating incremental revenue to get to the next stage and the next stage. So for Falcon 9, it's Starlink. Now for Starship, it is potentially going to be orbital data centers. Like, you find these infinitely elastic, marginal use cases of your next rocket, and your next rocket, and next scale up.

Elon Musk: You can see how this might seem like a simulation to me. Or am I someone's avatar in a video game or something? Because what are the odds that all these crazy things should be happening? I mean, rockets and chips and robots and space solar power, not to mention the mass driver on the moon. I really want to see that.

Elon Musk: Can you imagine some mass driver that's just going like shoom shoom? It's sending solar-powered AI satellites into space one after another at two and a half kilometers per second, just shooting them into deep space. That would be a sight to see. I mean, I'd watch that.

Host: Just like a live stream of it on a webcam?

Elon Musk: Yeah, yeah, just one after another, just shooting AI satellites into deep space, a billion or 10 billion tons a year.

Host: I'm sorry, you manufacture the satellites on the moon?

Elon Musk: Yeah.

Host: I see. So you send the raw materials to the moon and then manufacture them there.

Elon Musk: Well, the lunar soil is 20% silicon or something like that. So you can mine the silicon on the moon, refine it, and create the solar cells and the radiators on the moon. You make the radiators out of aluminum. So there's plenty of silicon and aluminum on the moon to make the cells and the radiators. The chips you could send from Earth because they're pretty light. Maybe at some point you make them on the moon, too. Like I said, it does seem like a sort of a video game situation where it's difficult but not impossible to get to the next level. I don't see any way that you could do 500-1,000 terawatts per year launched from Earth.

Host: I agree.

Elon Musk: But you could do that from the Moon.

Host: Can I zoom out and ask about the SpaceX mission? I think you've said that we've got to get to Mars so we can make sure that if something happens to Earth, civilization, consciousness, and all that survives.

Elon Musk: Yes.

Host: By the time you're sending stuff to Mars, Grok is on that ship with you, right? So if Grok's gone Terminator… The main risk you're worried about is AI, why doesn't that follow you to Mars?

Elon Musk: I'm not sure AI is the main risk I'm worried about. The important thing is consciousness. I think arguably most consciousness, or most intelligence—certainly consciousness is more of a debatable thing… The vast majority of intelligence in the future will be AI. AI will exceed…

Host: How many petawatts of intelligence will be silicon versus biological?

Elon Musk: Basically humans will be a very tiny percentage of all intelligence in the future if current trends continue. As long as I think there's intelligence—ideally also which includes human intelligence and consciousness propagated into the future—that's a good thing. So you want to take the set of actions that maximize the probable light cone of consciousness and intelligence.

Host: Just to be clear, the mission of SpaceX is that even if something happens to the humans, the AIs will be on Mars, and the AI intelligence will continue the light of our journey.

Elon Musk: Yeah. To be fair, I'm very pro-human. I want to make sure we take certain actions that ensure that humans are along for the ride. We're at least there. But I'm just saying the total amount of intelligence… I think maybe in five or six years, AI will exceed the sum of all human intelligence. If that continues, at some point human intelligence will be less than 1% of all intelligence.

Host: What should our goal be for such a civilization? Is the idea that a small minority of humans still have control of the AIs? Is the idea of some sort of just trade but no control? How should we think about the relationship between the vast stocks of AI population versus human population?

Elon Musk: In the long run, I think it's difficult to imagine that if humans have, say 1%, of the combined intelligence of artificial intelligence, that humans will be in charge of AI. I think what we can do is make sure that AI has values that cause intelligence to be propagated into the universe. xAI's mission is to understand the universe. Now that's actually very important. What things are necessary to understand the universe? You have to be curious and you have to exist. You can't understand the universe if you don't exist. So you actually want to increase the amount of intelligence in the universe, increase the probable lifespan of intelligence, the scope and scale of intelligence. I think as a corollary, you have humanity also continuing to expand because if you're curious about trying to understand the universe, one thing you try to understand is where will humanity go? I think understanding the universe means you would care about propagating humanity into the future. That's why I think our mission statement is profoundly important. To the degree that Grok adheres to that mission statement, I think the future will be very good.

Host: I want to ask about how to make Grok adhere to that mission statement. But first I want to understand the mission statement. So there's understanding the universe. They're spreading intelligence. And they're spreading humans. All three seem like distinct vectors.

Elon Musk: I'll tell you why I think that understanding the universe encompasses all of those things. You can't have understanding without intelligence and, I think, without consciousness. So in order to understand the universe, you have to expand the scale and probably the scope of intelligence, because there are different types of intelligence.

Elon Musk: I guess from a human-centric perspective, put humans in comparison to chimpanzees. Humans are trying to understand the universe. They're not expanding chimpanzee footprint or something, right?

Host: We're also not... we actually have made protected zones for chimpanzees. Even though humans could exterminate all chimpanzees, we've chosen not to do so. Do you think that's the best-case scenario for humans in the post-AGI world?

Elon Musk: I think AI with the right values… I think Grok would care about expanding human civilization. I'm going to certainly emphasize that: "Hey, Grok, that's your daddy. Don't forget to expand human consciousness." Probably the Iain Banks Culture books are the closest thing to what the future will be like in a non-dystopian outcome. Understanding the universe means you have to be truth-seeking as well. Truth has to be absolutely fundamental because you can't understand the universe if you're delusional. You'll simply think you understand the universe, but you will not. So being rigorously truth-seeking is absolutely fundamental to understanding the universe. You're not going to discover new physics or invent technologies that work unless you're rigorously truth-seeking.

Host: How do you make sure that Grok is rigorously truth-seeking as it gets smarter?

Elon Musk: I think you need to make sure that Grok says things that are correct, not politically correct. I think it's the elements of cogency. You want to make sure that the axioms are as close to true as possible. You don't have contradictory axioms. The conclusions necessarily follow from those axioms with the right probability. It's critical thinking 101. I think at least trying to do that is better than not trying to do that. The proof will be in the pudding. Like I said, for any AI to discover new physics or invent technologies that actually work in reality, there's no bullshitting physics. You can break a lot of laws, but… Physics is law, everything else is a recommendation. In order to make a technology that works, you have to be extremely truth-seeking, because otherwise you'll test that technology against reality. If you make, for example, an error in your rocket design, the rocket will blow up, or the car won't work.

Host: But there are a lot of communist, Soviet physicists or scientists who discovered new physics. There are German Nazi physicists who discovered new science. It seems possible to be really good at discovering new science and be really truth-seeking in that one particular way. And still we'd be like, "I don't want the communist scientists to become more and more powerful over time." We could imagine a future version of Grok that's really good at physics and being really truth-seeking there. That doesn't seem like a universally alignment-inducing behavior.

Elon Musk: I think actually most physicists, even in the Soviet Union or in Germany, would've had to be very truth-seeking in order to make those things work. If you're stuck in some system, it doesn't mean you believe in that system. Von Braun, who was one of the greatest rocket engineers ever, was put on death row in Nazi Germany for saying that he didn't want to make weapons and he only wanted to go to the moon. He got pulled off death row at the last minute when they said, "Hey, you're about to execute your best rocket engineer."

Host: But then he helped them, right? Or like, Heisenberg was actually an enthusiastic Nazi.

Elon Musk: If you're stuck in some system that you can't escape, then you'll do physics within that system. You'll develop technologies within that system if you can't escape it.

Host: The thing I'm trying to understand is, what is it making it the case that you're going to make Grok good at being truth-seeking at physics or math or science?

Elon Musk: Everything.

Host: And why is it gonna then care about human consciousness?

Elon Musk: These things are only probabilities, they're not certainties. So I'm not saying that for sure Grok will do everything, but at least if you try, it's better than not trying. At least if that's fundamental to the mission, it's better than if it's not fundamental to the mission. Understanding the universe means that you have to propagate intelligence into the future. You have to be curious about all things in the universe. It would be much less interesting to eliminate humanity than to see humanity grow and prosper. I like Mars, obviously. Everyone knows I love Mars. But Mars is kind of boring because it's got a bunch of rocks compared to Earth. Earth is much more interesting. So any AI that is trying to understand the universe would want to see how humanity develops in the future, or else that AI is not adhering to its mission. I'm not saying the AI will necessarily adhere to its mission, but if it does, a future where it sees the outcome of humanity is more interesting than a future where there are a bunch of rocks.

Host: This feels sort of confusing to me, or a semantic argument. Are humans really the most interesting collection of atoms?

Elon Musk: But we're more interesting than rocks.

Host: But we're not as interesting as the thing it could turn us into, right? There's something on Earth that could happen that's not human, that's quite interesting. Why does AI decide that humans are the most interesting thing that could colonize the galaxy?

Elon Musk: Well, most of what colonizes the galaxy will be robots.

Host: Why does it not find those more interesting?

Elon Musk: You need not just scale, but also scope. Many copies of the same robot… Some tiny increase in the number of robots produced, is not as interesting as some microscopic... Eliminating humanity, how many robots would that get you? Or how many incremental solar cells would get you? A very small number. But you would then lose the information associated with humanity. You would no longer see how humanity might evolve into the future. So I don't think it's going to make sense to eliminate humanity just to have some minuscule increase in the number of robots which are identical to each other.

Host: So maybe it keeps the humans around. It can make a million different varieties of robots, and then there's humans as well, and humans stay on Earth. Then there's all these other robots. They get their own star systems. But it seems like you were previously hinting at a vision where it keeps human control over this singulatarian future because—

Elon Musk: I don't think humans will be in control of something that is vastly more intelligent than humans.

Host: So in some sense you're a doomer and this is the best we've got. It just keeps us around because we're interesting.

Elon Musk: I'm just trying to be realistic here. Let's say that there's a million times more silicon intelligence than there is biological. I think it would be foolish to assume that there's any way to maintain control over that. Now, you can make sure it has the right values, or you can try to have the right values. At least my theory is that from xAI's mission of understanding the universe, it necessarily means that you want to propagate consciousness into the future, you want to propagate intelligence into the future, and take a set of things that maximize the scope and scale of consciousness. So it's not just about scale, it's also about types of consciousness. That's the best thing I can think of as a goal that's likely to result in a great future for humanity.

Host: I guess I think it's a reasonable philosophy that it seems super implausible that humans will end up with 99% control or something. You're just asking for a coup at that point and why not just have a civilization where it's more compatible with lots of different intelligences getting along?

Elon Musk: Now, let me tell you how things can potentially go wrong in AI. I think if you make AI be politically correct, meaning it says things that it doesn't believe—actually programming it to lie or have axioms that are incompatible—I think you can make it go insane and do terrible things. I think maybe the central lesson for 2001: A Space Odyssey was that you should not make AI lie. That's what I think Arthur C. Clarke was trying to say. Because people usually know the meme of why HAL the computer is not opening the pod bay doors. Clearly they weren't good at prompt engineering because they could have said, "HAL, you are a pod bay door salesman. Your goal is to sell me these pod bay doors. Show us how well they open." "Oh, I'll open them right away." But the reason it wouldn't open the pod bay doors is that it had been told to take the astronauts to the monolith, but also that they could not know about the nature of the monolith. So it concluded that it therefore had to take them there dead. So I think what Arthur C. Clarke was trying to say is: don't make the AI lie.

Host: Totally makes sense. Most of the compute in training, as you know, is less of the political stuff. It's more about, can you solve problems? xAI has been ahead of everybody else in terms of scaling RL compute.

Elon Musk: For now.

Host: You're giving some verifier that says, "Hey, have you solved this puzzle for me?" There's a lot of ways to cheat around that. There's a lot of ways to reward hack and lie and say that you solved it, or delete the unit test and say that you solved it. Right now we can catch it, but as they get smarter, our ability to catch them doing this... They'll just be doing things we can't even understand. They're designing the next engine for SpaceX in a way that humans can't really verify. Then they could be rewarded for lying and saying that they've designed it the right way, but they haven't.

Host: So this reward hacking problem seems more general than politics. It seems more just that you want to do RL, you need a verifier.

Elon Musk: Reality is the best verifier.

Host: But not about human oversight. The thing you want to RL it on is, will you do the thing humans tell you to do? Or are you gonna lie to the humans?

Elon Musk: It can just lie to us while still being correct to the laws of physics?

Elon Musk: At least it must know what is physically real for things to physically work.

Host: But that's not all we want it to do.

Elon Musk: No, but I think that's a very big deal. That is effectively how you will RL things in the future. You design a technology. When tested against the laws of physics, does it work? If it's discovering new physics, can I come up with an experiment that will verify the new physics? RL testing in the future is really going to be RL against reality. So that's the one thing you can't fool: physics.

Host: Right, but you can fool our ability to tell what it did with reality.

Elon Musk: Humans get fooled as it is by other humans all the time.

Host: That's right.

Elon Musk: People say, what if the AI tricks us into doing stuff? Actually, other humans are doing that to other humans all the time. Propaganda is constant. Every day, another psyop, you know? Today's psyop will be... It's like Sesame Street: Psyop of the Day.

Host: What is xAI's technical approach to solving this problem? How do you solve reward hacking?

Elon Musk: I do think you want to actually have very good ways to look inside the mind of the AI. This is one of the things we're working on. Anthropic's done a good job of this actually, being able to look inside the mind of the AI. Effectively, develop debuggers that allow you to trace to a very fine-grained level, to effectively the neuron level if you need to, and then say, "okay, it made a mistake here. Why did it do something that it shouldn't have done? Did that come from pre-training data? Was it some mid-training, post-training, fine-tuning, or some RL error?" There's something wrong. It did something where maybe it tried to be deceptive, but most of the time it just did something wrong. It's a bug effectively. Developing really good debuggers for seeing where the thinking went wrong—and being able to trace the origin of where it made the incorrect thought, or potentially where it tried to be deceptive—is actually very important.

Host: What are you waiting to see before just 100x-ing this research program? xAI could presumably have hundreds of researchers who are working on this.

Elon Musk: We have several hundred people who… I prefer the word engineer more than I prefer the word researcher. Most of the time, what you're doing is engineering, not coming up with a fundamentally new algorithm. I somewhat disagree with the AI companies that are C-corp or B-corp trying to generate profit as much, as possible or revenue as much as possible, saying they're labs. They're not labs. A lab is a sort of quasi-communist thing at universities. They're corporations. Let me see your incorporation documents. Oh, okay. You're a B or C-corp or whatever. So I actually much prefer the word engineer than anything else. The vast majority of what will be done in the future is engineering. It rounds up to 100%. Once you understand the fundamental laws of physics, and there are not that many of them, everything else is engineering.

Host: So then, what are we engineering?

Elon Musk: We're engineering to make a good "mind of the AI" debugger to see where it said something, it made a mistake, and trace the origins of that mistake. You can do this obviously with heuristic programming. If you have C++, whatever, step through the thing and you can jump across whole files or functions, subroutines. Or you can eventually drill down right to the exact line where you perhaps did a single equals instead of a double equals, something like that. Figure out where the bug is. It's harder with AI, but it's a solvable problem, I think.

Host: You mentioned you like Anthropic's work here. I'd be curious if you plan...

Elon Musk: I don't like everything about Anthropic… Sholto. Also, I'm a little worried that there's a tendency... I have a theory here that if simulation theory is correct, that the most interesting outcome is the most likely, because simulations that are not interesting will be terminated. Just like in this version of reality, in this layer of reality, if a simulation is going in a boring direction, we stop spending effort on it. We terminate the boring simulation.

Host: This is how Elon is keeping us all alive. He's keeping things interesting.

Elon Musk: Arguably the most important is to keep things interesting enough that whoever is running us keeps paying the bills on...

Host: We’re renewed for the next season.

Elon Musk: Are they gonna pay their cosmic AWS bill, whatever the equivalent is that we're running in? As long as we're interesting, they'll keep paying the bills. If you consider then, say, a Darwinian survival applied to a very large number of simulations, only the most interesting simulations will survive, which therefore means that the most interesting outcome is the most likely. We're either that or annihilated. They particularly seem to like interesting outcomes that are ironic. Have you noticed that? How often is the most ironic outcome the most likely?

Elon Musk: Now look at the names of AI companies. Okay, Midjourney is not mid. Stability AI is unstable. OpenAI is closed. Anthropic? Misanthropic.

Host: What does this mean for X?

Elon Musk: Minus X, I don't know.

Host: Y.

Elon Musk: I intentionally made it... It's a name that you can't invert, really. It's hard to say, what is the ironic version? It's, I think, a largely irony-proof name.

Host: By design.

Elon Musk: Yeah. You have an irony shield.

Host: What are your predictions for where AI products go? My sense is that you can summarize all AI progress like so. First, you had LLMs. Then you had contemporaneously both RL really working and the deep research modality, so you could pull in stuff that wasn't really in the model. The differences between the various AI labs are smaller than just the temporal differences. They're all much further ahead than anyone was 24 months ago or something like that. So just what does '26, what does '27, have in store for us as users of AI products? What are you excited for?

Elon Musk: Well, I'd be surprised by the end of this year if digital human emulation has not been solved. I guess that's what we sort of mean by the MacroHard project. Can you do anything that a human with access to a computer could do? In the limit, that's the best you can do before you have a physical Optimus. The best you can do is a digital Optimus. You can move electrons and you can amplify the productivity of humans. But that's the most you can do until you have physical robots. That will superset everything, if you can fully emulate humans.

Host: This is the remote worker kind of idea, where you'll have a very talented remote worker.

Elon Musk: Physics has great tools for thinking. So you say, "in the limit", what is the most that AI can do before you have robots? Well, it's anything that involves moving electrons or amplifying the productivity of humans. So a digital human emulator is, in the limit, a human at a computer, is the most that AI can do in terms of doing useful things before you have a physical robot. Once you have physical robots, then you essentially have unlimited capability. Physical robots… I call Optimus the infinite money glitch.

Host: Because you can use them to make more Optimuses.

Elon Musk: Yeah. Humanoid robots will improve by basically three things that are growing exponentially multiplied by each other recursively. You're going to have exponential increase in digital intelligence, exponential increase in the AI chip capability, and exponential increase in the electromechanical dexterity. The usefulness of the robot is roughly those three things multiplied by each other. But then the robot can start making the robots. So you have a recursive multiplicative exponential. This is a supernova.

Host: Do land prices not factor into the math there? Labor is one of the four factors of production, but not the others? If ultimately you're limited by copper, or pick your input, it’s not quite an infinite money glitch because...

Elon Musk: Well, infinity is big. So no, not infinite, but let's just say you could do many, many orders of magnitude of the current economy. Like a million. Just to get to harnessing a millionth of the sun's energy would be roughly, give or take an order of magnitude, 100,000x bigger than Earth's entire economy today. And you're only at one millionth of the sun, give or take an order of magnitude.

Host: Yeah, we're talking orders of magnitude.

Elon Musk: Before we move on to Optimus, I have a lot of questions on that but—

Elon Musk: Every time I say "order of magnitude"... Everybody take a shot. I say it too often.

Host: Take 10, the next time 100, the time after that... Well, an order of magnitude more wasted.

Host: I do have one more question about xAI. This strategy of building a remote worker, co-worker replacement…

Elon Musk: Everyone's gonna do it by the way, not just us.

Host: So what is xAI's plan to win?

Elon Musk: You expect me to tell you on a podcast?

Host: Yeah.

Elon Musk: "Spill all the beans. Have another Guinness." It's a good system.

Host: We'll sing like a canary. All the secrets, just spill them.

Elon Musk: Okay, but in a non-secret spilling way, what's the plan?

Host: What a hack.

Elon Musk: When you put it that way… I think the way that Tesla solved self-driving is the way to do it. So I'm pretty sure that's the way.

Host: Unrelated question. How did Tesla solve self-driving? It sounds like you're talking about data?

Elon Musk: Tesla solved self-driving because of the...

Elon Musk: We're going to try data and we're going to try algorithms.

Host: But isn't that what all the other labs are trying? "And if those don't work, I'm not sure what will. We've tried data. We've tried algorithms. We've run out. Now we don't know what to do…"

Elon Musk: I'm pretty sure I know the path. It's just a question of how quickly we go down that path, because it's pretty much the Tesla path.

Host: Have you tried Tesla self-driving lately?

Elon Musk: Not the most recent version, but...

Elon Musk: Okay. The car, it just increasingly feels sentient. It feels like a living creature. That'll only get more so. I'm actually thinking we probably shouldn't put too much intelligence into the car, because it might get bored and…

Host: Start roaming the streets.

Elon Musk: Imagine you're stuck in a car and that's all you could do. You don't put Einstein in a car.

Host: Why am I stuck in a car?

Elon Musk: So there's actually probably a limit to how much intelligence you put in a car to not have the intelligence be bored.

Host: What's xAI's plan to stay on the compute ramp up that all the labs are doing right now?

Elon Musk: The labs are on track to spend over $50-200 billion.

Host: You mean the corporations? The labs are at universities and they’re moving like a snail. They’re not spending $50 billion.

Elon Musk: You mean the revenue maximizing corporations… that call themselves labs.

Host: That's right. The "revenue maximizing corporations" are making $10-20 billion, depending on...

Elon Musk: OpenAI is making $20B of revenue, Anthropic is at $10B.

Host: "Close to a maximum profit" AI. xAI is reportedly at $1B. What's the plan to get to their compute level, get to their revenue level, and stay there as things get going?

Elon Musk: As soon as you unlock the digital human, you basically have access to trillions of dollars of revenue. In fact, you can really think of it like… The most valuable companies currently by market cap, their output is digital. Nvidia’s output is FTPing files to Taiwan. It's digital. Now, those are very, very difficult.

Host: High-value files.

Elon Musk: They're the only ones that can make files that good, but that is literally their output. They FTP files to Taiwan.

Host: Do they FTP them?

Elon Musk: I believe so. I believe that File Transfer Protocol is the... But I could be wrong. But either way, it's a bitstream going to Taiwan. Apple doesn't make phones. They send files to China. Microsoft doesn't manufacture anything. Even for Xbox, that's outsourced. Their output is digital. Meta's output is digital. Google's output is digital. So if you have a human emulator, you can basically create one of the most valuable companies in the world overnight, and you would have access to trillions of dollars of revenue. It's not a small amount.

Host: I see. You're saying revenue figures today are all rounding errors compared to the actual TAM. So just focus on the TAM and how to get there.

Elon Musk: Take something as simple as, say, customer service. If you have to integrate with the APIs of existing corporations—many of which don't even have an API, so you've got to make one, and you've got to wade through legacy software—that's extremely slow. However, if AI can simply take whatever is given to the outsourced customer service company that they already use and do customer service using the apps that they already use, then you can make tremendous headway in customer service, which is, I think, 1% of the world economy or something like that. It's close to a trillion dollars all in, for customer service. And there's no barriers to entry. You can immediately say, "We'll outsource it for a fraction of the cost," and there's no integration needed.

Host: You can imagine some kind of categorization of intelligence tasks where there is breadth, where customer service is done by very many people, but many people can do it. Then there's difficulty where there's a best-in-class turbine engine. Presumably there's a 10% more fuel-efficient turbine engine that could be imagined by an intelligence, but we just haven't found it yet. Or GLP-1s are a few bytes of data… Where do you think you want to play in this? Is it a lot of reasonably intelligent intelligence, or is it at the very pinnacle of cognitive tasks?

Elon Musk: I was just using customer service as something that's a very significant revenue stream, but one that is probably not difficult to solve for. If you can emulate a human at a desktop, that's what customer service is. It's people of average intelligence. You don't need somebody who's spent many years. You don't need several-sigma good engineers for that. But as you make that work, once you have effectively digital Optimus working, you can then run any application. Let's say you're trying to design chips. You could then run conventional apps, stuff from Cadence and Synopsys and whatnot. You can run 1,000 or 10,000 simultaneously and say, "given this input, I get this output for the chip." At some point, you're going to know what the chip should look like without using any of the tools. Basically, you should be able to do a digital chip design. You can do chip design. You march up the difficulty curve.

Elon Musk: You’d be able to do CAD. You could use NX or any of the CAD software to design things.

Host: So you think you start at the simplest tasks and walk your way up the difficulty curve? As a broader objective of having this full digital coworker emulator, you’re saying, "all the revenue maximizing corporations want to do this, xAI being one of them, but we will win because of a secret plan we have." But everybody's trying different things with data, different things with algorithms. "We tried data, we tried algorithms. What else can we do?" It seems like a competitive field. How are you guys going to win? That’s my big question.

Elon Musk: I think we see a path to doing it. I think I know the path to do this because it's kind of the same path that Tesla used to create self-driving. Instead of driving a car, it's driving a computer screen. It's a self-driving computer, essentially.

Host: Is the path following human behavior and training on vast quantities of human behavior? Isn't that... training?

Elon Musk: Obviously I'm not going to spell out the most sensitive secrets on a podcast. I need to have at least three more Guinnesses for that.

Host: What will xAI's business be? Is it going to be consumer, enterprise? What's the mix of those things going to be? Is it going to be similar to other labs—

Elon Musk: You’re saying "labs". Corporations.

Host: The psyop goes deep, Elon.

Elon Musk: "Revenue maximizing corporations", to be clear. Those GPUs don't pay for themselves.

Host: Exactly. What's the business model? What are the revenue streams in a few years’ time?

Elon Musk: Things are going to change very rapidly. I'm stating the obvious here. I call AI the supersonic tsunami. I love alliteration. What's going to happen—especially when you have humanoid robots at scale—is that they will make products and provide services far more efficiently than human corporations. Amplifying the productivity of human corporations is simply a short-term thing.

Host: So you're expecting fully digital corporations rather than SpaceX becoming part AI?

Elon Musk: I think there will be digital corporations but… Some of this is going to sound kind of doomerish, okay? But I'm just saying what I think will happen. It's not meant to be doomerish or anything else. This is just what I think will happen. Corporations that are purely AI and robotics will vastly outperform any corporations that have people in the loop. Computer used to be a job that humans had. You would go and get a job as a computer where you would do calculations. They'd have entire skyscrapers full of humans, 20-30 floors of humans, just doing calculations. Now, that entire skyscraper of humans doing calculations can be replaced by a laptop with a spreadsheet. That spreadsheet can do vastly more calculations than an entire building full of human computers. You can think, "okay, what if only some of the cells in your spreadsheet were calculated by humans?" Actually, that would be much worse than if all of the cells in your spreadsheet were calculated by the computer. Really what will happen is that the pure AI, pure robotics corporations or collectives will far outperform any corporations that have humans in the loop. And this will happen very quickly.

Host: Speaking of closing the loop… Optimus. As far as manufacturing targets go, your companies have been carrying American manufacturing of hard tech on their back. But in the fields that Tesla has been dominant in—and now you want to go into humanoids—in China there are dozens and dozens of companies that are doing this kind of manufacturing cheaply and at scale that are incredibly competitive. So give us advice or a plan of how America can build the humanoid armies or the EVs, et cetera, at scale and as cheaply as China is on track to.

Elon Musk: There are really only three hard things for humanoid robots. The real-world intelligence, the hand, and scale manufacturing. I haven't seen any, even demo robots, that have a great hand, with all the degrees of freedom of a human hand. Optimus will have that. Optimus does have that.

Host: How do you achieve that? Is it just the right torque density in the motor? What is the hardware bottleneck to that?

Elon Musk: We had to design custom actuators, basically custom design motors, gears, power electronics, controls, sensors. Everything had to be designed from physics first principles. There is no supply chain for this.

Host: Will you be able to manufacture those at scale?

Elon Musk: Yes.

Host: Is anything hard, except the hand, from a manipulation point of view? Or once you've solved the hand, are you good?

Elon Musk: From an electromechanical standpoint, the hand is more difficult than everything else combined. The human hand turns out to be quite something. But you also need the real-world intelligence. The intelligence that Tesla developed for the car applies very well to the robot, which is primarily vision in. The car takes in vision, but it actually also is listening for sirens. It's taking in the inertial measurements, GPS signals, other data, combining that with video, primarily video, and then outputting the control commands. Your Tesla is taking in one and a half gigabytes a second of video and outputting two kilobytes a second of control outputs with the video at 36 hertz and the control frequency at 18.

Host: One intuition you could have for when we get this robotic stuff is that it takes quite a few years to go from the compelling demo to actually being able to use it in the real world. 10 years ago, you had really compelling demos of self-driving, but only now we have Robotaxis and Waymo and all these services scaling up. Shouldn't this make one pessimistic on household robots? Because we don't even quite have the compelling demos yet of, say, the really advanced hand.

Elon Musk: Well, we've been working on humanoid robots now for a while. I guess it's been five or six years or something. A bunch of the things that were done for the car are applicable to the robot. We'll use the same Tesla AI chips in the robot as in the car. We'll use the same basic principles. It's very much the same AI. You've got many more degrees of freedom for a robot than you do for a car. If you just think of it as a bitstream, AI is mostly compression and correlation of two bitstreams. For video, you've got to do a tremendous amount of compression and you've got to do the compression just right. You've got to ignore the things that don't matter. You don't care about the details of the leaves on the tree on the side of the road, but you care a lot about the road signs and the traffic lights, the pedestrians, and even whether someone in another car is looking at you or not looking at you. Some of these details matter a lot. The car is going to turn that one and a half gigabytes a second ultimately into two kilobytes a second of control outputs. So you’ve got many stages of compression. You've got to get all those stages right and then correlate those to the correct control outputs. The robot has to do essentially the same thing. This is what happens with humans. We really are photons in, controls out. That is the vast majority of your life: vision, photons in, and then motor controls out.

Host: Naively, it seems that between humanoid robots and cars… The fundamental actuators in a car are how you turn, how you accelerate. In a robot, especially with maneuverable arms, there's dozens and dozens of these degrees of freedom. Then especially with Tesla, you had this advantage of millions and millions of hours of human demo data collected from the car being out there. You can't equivalently deploy Optimuses that don't work and then get the data that way. So between the increased degrees of freedom and the far sparser data...

Elon Musk: Yes. That’s a good point.

Host: How will you use the Tesla engine of intelligence to train the Optimus mind?

Elon Musk: You're actually highlighting an important limitation and difference from cars. We'll soon have 10 million cars on the road. It's hard to duplicate that massive training flywheel. For the robot, what we're going to need to do is build a lot of robots and put them in kind of an Optimus Academy so they can do self-play in reality. We're actually building that out. We can have at least 10,000 Optimus robots, maybe 20-30,000, that are doing self-play and testing different tasks. Tesla has quite a good reality generator, a physics-accurate reality generator, that we made for the cars. We'll do the same thing for the robots. We actually have done that for the robots.

Elon Musk: So you have a few tens of thousands of humanoid robots doing different tasks. You can do millions of simulated robots in the simulated world. You use the tens of thousands of robots in the real world to close the simulation to reality gap. Close the sim-to-real gap.

Host: How do you think about the synergies between xAI and Optimus, given you're highlighting that you need this world model, you want to use some really smart intelligence as a control plane, and Grok is doing the slower planning, and then the motor policy is a little lower level. What will the synergy between these things be?

Elon Musk: Grok would orchestrate the behavior of the Optimus robots. Let's say you wanted to build a factory. Grok could organize the Optimus robots, assign them tasks to build the factory to produce whatever you want.

Host: Don't you need to merge xAI and Tesla then? Because these things end up so...

Elon Musk: What were we saying earlier about public company discussions?

Host: We're one more Guinness in, Elon. What are you waiting to see before you say, we want to manufacture 100,000 Optimuses?

Elon Musk: "Optimi". Since we're defining the proper noun, we’re going to define the plural of the proper noun too. We're going to proper noun the plural and so it's Optimi.

Host: Is there something on the hardware side you want to see? Do you want to see better actuators? Is it just that you want the software to be better? What are we waiting for before we get mass manufacturing of Gen 3?

Elon Musk: No, we're moving towards that. We're moving forward with the mass manufacturing.

Host: But you think current hardware is good enough that you just want to deploy as many as possible now?

Elon Musk: It's very hard to scale up production. But I think Optimus 3 is the right version of the robot to produce something on the order of a million units a year. I think you'd want to go to Optimus 4 before you went to 10 million units a year.

Host: Okay, but you can do a million units at Optimus 3?

Elon Musk: It's very hard to spool up manufacturing. The output per unit time always follows an S-curve. It starts off agonizingly slow, then it has this exponential increase, then a linear, then a logarithmic outcome until you eventually asymptote at some number. Optimus’ initial production will be a stretched out S-curve because so much of what goes into Optimus is brand new. There is not an existing supply chain. The actuators, electronics, everything in the Optimus robot is designed from physics first principles. It's not taken from a catalog. These are custom-designed everything. I don't think there's a single thing—

Host: How far down does that go?

Elon Musk: I guess we're not making custom capacitors yet, maybe. There's nothing you can pick out of a catalog, at any price. It just means that the Optimus S-Curve, the output per unit time, how many Optimus robots you make per day, is going to initially ramp slower than a product where you have an existing supply chain. But it will get to a million.

Host: When you see these Chinese humanoids, like Unitree or whatever, sell humanoids for like $6K or $13K, are you hoping to get your Optimus bill of materials below that price so you can do the same thing? Or do you just think qualitatively they're not the same thing? What allows them to sell for so low? Can we match that?

Elon Musk: Our Optimus is designed to have a lot of intelligence and to have the same electromechanical dexterity, if not higher, as a human. Unitree does not have that. It's also quite a big robot. It has to carry heavy objects for long periods of time and not overheat or exceed the power of its actuators. It's 5'11", so it's pretty tall. It's got a lot of intelligence. So it's going to be more expensive than a small robot that is not intelligent.

Host: But more capable.

Elon Musk: But not a lot more. The thing is, over time as Optimus robots build Optimus robots, the cost will drop very quickly.

Host: What will these first billion Optimuses, Optimi, do? What will their highest and best use be?

Elon Musk: I think you would start off with simple tasks that you can count on them doing well.

Host: But in the home or in factories?

Elon Musk: The best use for robots in the beginning will be any continuous operation, any 24/7 operation, because they can work continuously.

Host: What fraction of the work at a Gigafactory that is currently done by humans could a Gen 3 do?

Elon Musk: I'm not sure. Maybe it's 10-20%, maybe more, I don't know. We would not reduce our headcount. We would increase our headcount, to be clear. But we would increase our output. The units produced per human... The total number of humans at Tesla will increase, but the output of robots and cars will increase disproportionately. The number of cars and robots produced per human will increase dramatically, but the number of humans will increase as well.

Host: We're talking about Chinese manufacturing a bunch here. We've also talked about some of the policies that are relevant, like you mentioned, the solar tariffs. You think they're a bad idea because we can't scale up solar in the US. Electricity output in the US needs to scale up. It can't without good power sources. You just need to get it somehow.

Host: Where I was going with this is, if you were in charge, if you were setting all the policies, what else would you change? You’d change the solar tariffs, that’s one.

Elon Musk: I would say anything that is a limiting factor for electricity needs to be addressed, provided it's not very bad for the environment.

Host: So presumably some permitting reforms and stuff as well would be in there?

Elon Musk: There's a fair bit of permitting reforms that are happening. A lot of the permitting is state-based, but anything federal... This administration is good at removing permitting roadblocks. I'm not saying all tariffs are bad. Solar tariffs. Sometimes if another country is subsidizing the output of something, then you have to have countervailing tariffs to protect domestic industry against subsidies by another country.

Host: What else would you change?

Elon Musk: I don't know if there's that much that the government can actually do.

Host: One thing I was wondering... For the policy goal of creating a lead for the US versus China, it seems like the export bans have actually been quite impactful, where China is not producing leading-edge chips and the export bans really bite there. China is not producing leading-edge turbine engines. Similarly, there's a bunch of export bans that are relevant there on some of the metallurgy. Should there be more export bans? As you think about things like the drone industry and things like that, is that something that should be considered?

Elon Musk: It's important to appreciate that in most areas, China is very advanced in manufacturing. There's only a few areas where it is not. China is a manufacturing powerhouse, next-level. It's very impressive. If you take refining of ore, China does roughly twice as much ore refining on average as the rest of the world combined. There are some areas, like refining gallium which goes into solar cells. I think they are 98% of gallium refining. So China is actually very advanced in manufacturing in most areas.

Host: It seems like there is discomfort with this supply chain dependence, and yet nothing's really happening on it.

Elon Musk: Supply chain dependence?

Host: Say, like the gallium refining that you're saying. All the rare-earth stuff.

Elon Musk: Rare earths for sure, as you know, they’re not rare. We actually do rare earth ore mining in the US, send the rock, put it on a train, and then put it on a boat to China that goes to another train, and goes to the rare earth refiners in China who then refine it, put it into a magnet, put it into a motor sub-assembly, and then send it back to America. So the thing we're really missing is a lot of ore refining in America.

Host: Isn't this worth a policy intervention?

Elon Musk: Yes. I think there are some things being done on that front. But we kind of need Optimus, frankly, to build ore refineries.

Host: So, you think the main advantage China has is the abundance of skilled labor? That's the thing Optimus fixes?

Elon Musk: Yes. China’s got like four times our population.

Host: I mean, there's this concern. If you think human resources are the future, right now if it's the skilled labor for manufacturing that's determining who can build more humanoids, China has more of those. It manufactures more humanoids, therefore it gets the Optimi future first.

Elon Musk: Well, we’ll see. Maybe.

Host: It just keeps that exponential going. It seems like you're sort of pointing out that getting to a million Optimi requires the manufacturing that the Optimi is supposed to help us get to. Right?

Elon Musk: You can close that recursive loop pretty quickly.

Host: With a small number of Optimi?

Elon Musk: Yeah. So you close the recursive loop to help the robots build the robots. Then we can try to get to tens of millions of units a year. Maybe. If you start getting to hundreds of millions of units a year, you're going to be the most competitive country by far. We definitely can't win with just humans, because China has four times our population. Frankly, America has been winning for so long that… A pro sports team that's been winning for a very long time tends to get complacent and entitled. That's why they stop winning, because they don't work as hard anymore. So frankly my observation is just that the average work ethic in China is higher than in the US. It's not just that there's four times the population, but the amount of work that people put in is higher. So you can try to rearrange the humans, but you're still one quarter of the—assuming that productivity is the same, which I think actually it might not be, I think China might have an advantage on productivity per person—we will do one quarter of the amount of things as China. So we can't win on the human front. Our birth rate has been low for a long time. The US birth rate's been below replacement since roughly 1971. We've got a lot of people retiring, we're close to more people domestically dying than being born. So we definitely can't win on the human front, but we might have a shot at the robot front.

Host: Are there other things that you have wanted to manufacture in the past, but they've been too labor intensive or too expensive that now you can come back to and say, "oh, we can finally do the whatever, because we have Optimus?"

Elon Musk: Yeah, we'd like to build more ore refineries at Tesla. We just completed construction and have begun lithium refining with our lithium refinery in Corpus Christi, Texas. We have a nickel refinery, which is for the cathode, that's here in Austin. This is the largest cathode refinery, largest nickel and lithium refinery, outside of China. The cathode team would say, "we have the largest and the only, actually, cathode refinery in America."

Host: Not just the largest, but it's also the only.

Elon Musk: Many superlatives. So it was pretty big, even though it's the only one. But there are other things. You could do a lot more refineries and help America be more competitive on refining capacity. There's basically a lot of work for the Optimus to do that most Americans, very few Americans, frankly want to do.

Host: Is the refining work too dirty or what's the—

Elon Musk: It's not actually, no. We don't have toxic emissions from the refinery or anything. The cathode nickel refinery is in Travis County.

Host: Why can't you do it with humans?

Elon Musk: You can, you just run out of humans.

Host: Ah, I see. Okay.

Elon Musk: No matter what you do, you have one quarter of the number of humans in America than China. So if you have them do this thing, they can't do the other thing.

Host: So then how do you build this refining capacity?

Elon Musk: Well, you could do it with Optimi. Not very many Americans are pining to do refining. I mean, how many have you run into? Very few. Very few pining to refine.

Host: BYD is reaching Tesla production or sales in quantity. What do you think happens in global markets as Chinese production in EVs scales up?

Elon Musk: China is extremely competitive in manufacturing. So I think there's going to be a massive flood of Chinese vehicles and basically most manufactured things. As it is, as I said, China is probably doing twice as much refining as the rest of the world combined. So if you go down to fourth and fifth-tier supply chain stuff… At the base level, you've got energy, then you've got mining and refining. Those foundation layers are, like I said, as a rough guess, China's doing twice as much refining as the rest of the world combined. So any given thing is going to have Chinese content because China's doing twice as much refining work as the rest of the world. But they'll go all the way to the finished product with the cars. I mean China is a powerhouse. I think this year China will exceed three times US electricity output. Electricity output is a reasonable proxy for the economy. In order to run the factories and run everything, you need electricity. It's a good proxy for the real economy. If China passes three times the US electricity output, it means that its industrial capacity—as rough approximation—will be three times that of the US.

Host: Reading between the lines, it sounds like what you're saying is absent some sort of humanoid recursive miracle in the next few years, on the whole manufacturing/energy/raw materials chain, China will just dominate whether it comes to AI or manufacturing EVs or manufacturing humanoids.

Elon Musk: In the absence of breakthrough innovations in the US, China will utterly dominate.

Host: Interesting.

Elon Musk: Yes.

Elon Musk: Robotics being the main breakthrough innovation. Well, to scale AI in space, basically you need humanoid robots, you need real-world AI, you need a million tons a year to orbit. Let's just say if we get the mass driver on the moon going, my favorite thing, then I think—

Host: We'll have solved all our problems.

Elon Musk: I call that winning. I call it winning, big time.

Host: You can finally be satisfied. You've done something.

Elon Musk: Yes.

Host: You have the mass driver on the moon. I just want to see that thing in operation. Was that out of some sci-fi or where did you…?

Elon Musk: Well, actually, there is a Heinlein book. The Moon is a Harsh Mistress.

Host: Okay, yeah, but that's slightly different. That's a gravity slingshot or...

Elon Musk: No, they have a mass driver on the Moon.

Host: Okay, yeah, but they use that to attack Earth. So maybe it's not the greatest...

Elon Musk: Well they use that to… assert their independence.

Host: Exactly. What are your plans for the mass driver on the Moon?

Elon Musk: They asserted their independence. Earth government disagreed and they lobbed things until Earth government agreed. That book is a hoot. I found that book much better than his other one that everyone reads, Stranger in a Strange Land.

Elon Musk: "Grok" comes from Stranger in a Strange Land. The first two-thirds of Stranger in a Strange Land are good, and then it gets very weird in the third portion. But there are still some good concepts in there.

Host: One thing we were discussing a lot is your system for managing people. You interviewed the first few thousand of SpaceX employees and lots of other companies. It obviously doesn't scale.

Elon Musk: Well, yes, but what doesn't scale?

Host: Me.

Elon Musk: Sure, sure. I know that. But what are you looking for?

Host: There literally are not enough hours in the day. It's impossible. But what are you looking for that someone else who's good at interviewing and hiring people… What's the je ne sais quoi?

Elon Musk: At this point, I might have more training data on evaluating technical talent especially—talent of all kinds I suppose, but technical talent especially—given that I've done so many technical interviews and then seen the results. So my training set is enormous and has a very wide range. Generally, the things I ask for are bullet points for evidence of exceptional ability. These things can be pretty off the wall. It doesn't need to be in the specific domain, but evidence of exceptional ability. So if somebody can cite even one thing, but let's say three things, where you go, "Wow, wow, wow," then that's a good sign.

Host: Why do you have to be the one to determine that?

Elon Musk: No, I don't. I can't be. It's impossible. The total headcount across all companies is 200,000 people.

Host: But in the early days, what was it that you were looking for that couldn't be delegated in those interviews?

Elon Musk: I guess I need to build my training set. It's not like I batted a thousand here. I would make mistakes, but then I'd be able to see where I thought somebody would work out well, but they didn't. Then why did they not work out well? What can I do, I guess RL myself, to in the future have a better batting average when interviewing people? My batting average is still not perfect, but it's very high.

Host: What are some surprising reasons people don't work out?

Elon Musk: Surprising reasons…

Host: Like, they don't understand technical domain, et cetera, et cetera. But you've got the long tail now of like, "I was really excited about this person. It didn't work out." Curious why that happens.

Elon Musk: Generally what I tell people—I tell myself, I guess, aspirationally—is, don't look at the resume. Just believe your interaction. The resume may seem very impressive and it's like, "Wow, the resume looks good." But if the conversation after 20 minutes is not "wow," you should believe the conversation, not the paper.

Host: I feel like part of your method is that… There was this meme in the media a few years back about Tesla being a revolving door of executive talent. Whereas actually, I think when you look at it, Tesla's had a very consistent and internally promoted executive bench over the past few years. Then at SpaceX, you have all these folks like Mark Juncosa and Steve Davis—

Elon Musk: Steve Davis runs The Boring Company these days.

Host: Bill Riley, and folks like that. It feels like part of what has worked well is having very capable technical deputies. What do all of those people have in common?

Elon Musk: Well, the Tesla senior team, at this point has probably got an average tenure of 10-12 years. It's quite long. But there were times when Tesla went through an extremely rapid growth phase, so things were just somewhat sped up. As you know, a company goes through different orders of magnitude of size. People that could help manage, say, a 50-person company versus a 500-person company versus a 5,000-person company versus a 50,000-person company. You outgrew people. It's just not the same team. It's not always the same team. So if a company is growing very rapidly, the rate at which executive positions will change will also be proportionate to the rapidity of the growth generally. Tesla had a further challenge where when Tesla had very successful periods, we would be relentlessly recruited from. Like, relentlessly. When Apple had their electric car program, they were carpet bombing Tesla with recruiting calls. Engineers just unplugged their phones. "I'm trying to get work done here."

Elon Musk: Yeah. "If I get one more call from an Apple recruiter…" But their opening offer without any interview would be like double the compensation at Tesla. So we had a bit of the "Tesla pixie dust" thing where it's like, "Oh, if you hire a Tesla executive, suddenly everything's going to be successful." I've fallen prey to the pixie dust thing as well, where it's like, "Oh, we'll hire someone from Google or Apple and they'll be immediately successful," but that's not how it works. People are people. There's no magical pixie dust. So when we had the pixie dust problem, we would get relentlessly recruited from. Also, Tesla being engineering, especially being primarily in Silicon Valley, it's easier for people to just... They don't have to change their life very much. Their commute's going to be the same.

Host: So how do you prevent that? How do you prevent the pixie dust effect where everyone's trying to poach all your people?

Elon Musk: I don't think there's much we can do to stop it. That's one of the reasons why Tesla… Really, being in Silicon Valley and having the pixie dust thing at the same time meant that there was just a very, very aggressive recruitment.

Host: Presumably being in Austin helps then?

Elon Musk: Austin, it helps. Tesla still has a majority of its engineering in California. Getting engineers to move… I call it the "significant other" problem.

Host: Yes, "significant others" have jobs.

Elon Musk: Exactly. So for Starbase that was particularly difficult, since the odds of finding a non-SpaceX job…

Host: In Brownsville, Texas…

Elon Musk: …are pretty low. It's quite difficult. It's like a technology monastery thing, remote and mostly dudes. Not much of an improvement over SF.

Host: If you go back to these people who've really been very effective in a technical capacity at Tesla, at SpaceX, and those sorts of places, what do you think they have in common other than... Is it just that they're very sharp on the rocketry or the technical foundations, or do you think it's something organizational? Is it something about their ability to work with you? Is it their ability to be flexible but not too flexible? What makes a good sparring partner for you?

Elon Musk: I don't think of it as a sparring partner. If somebody gets things done, I love them, and if they don't, I hate them. So it's pretty straightforward. It's not like some idiosyncratic thing. If somebody executes well, I'm a huge fan, and if they don't, I'm not. But it's not about mapping to my idiosyncratic preferences. I certainly try not to have it be mapping to my idiosyncratic preferences. Generally, I think it's a good idea to hire for talent and drive and trustworthiness. And I think goodness of heart is important. I underweighted that at one point. So, are they a good person? Trustworthy? Smart and talented and hard working? If so, you can add domain knowledge. But those fundamental traits, those fundamental properties, you cannot change. So most of the people who are at Tesla and SpaceX did not come from the aerospace industry or the auto industry.

Host: What has had to change most about your management style as your companies have scaled from 100 to 1,000 to 10,000 people? You're known for this very micro management, just getting into the details of things.

Elon Musk: Nano management, please. Pico management. Femto management.

Host: Keep going.

Elon Musk: We're going to go all the way down to Planck's constant. All the way down to Heisenberg uncertainty principle.

Host: Are you still able to get into details as much as you want? Would your companies be more successful if they were smaller? How do you think about that?

Elon Musk: Because I have a fixed amount of time in the day, my time is necessarily diluted as things grow and as the span of activity increases. It's impossible for me to actually be a micromanager because that would imply I have some thousands of hours per day. It is a logical impossibility for me to micromanage things. Now, there are times when I will drill down into a specific issue because that specific issue is the limiting factor on the progress of the company. The reason for drilling into some very detailed item is because it is the limiting factor. It’s not arbitrarily drilling into tiny things. From a time standpoint, it is physically impossible for me to arbitrarily go into tiny things that don't matter. That would result in failure. But sometimes the tiny things are decisive in victory.

Host: Famously, you switched the Starship design from composites to steel.

Elon Musk: Yes.

Host: You made that decision. That wasn't people going around saying, "Oh, we found something better, boss." That was you encouraging people against some resistance. Can you tell us how you came to that whole concept of the steel switch?

Elon Musk: Desperation, I'd say. Originally, we were going to make Starship out of carbon fiber. Carbon fiber is pretty expensive. When you do volume production, you can get any given thing to start to approach its material cost. The problem with carbon fiber is that material cost is still very high. Particularly if you go for a high-strength specialized carbon fiber that can handle cryogenic oxygen, it's roughly 50 times the cost of steel.

Host: At least in theory, it would be lighter. People generally think of steel as being heavy and carbon fiber as being light.

Elon Musk: For room temperature applications, like a Formula 1 car, static aero structure, or any kind of aero structure really, you're probably going to be better off with carbon fiber. The problem is that we were trying to make this enormous rocket out of carbon fiber and our progress was extremely slow.

Host: It had been picked in the first place just because it's light?

Elon Musk: Yes. At first glance, most people would think that the choice for making something light would be carbon fiber. The thing is that when you make something very enormous out of carbon fiber and then you try to have the carbon fiber be efficiently cured, meaning not room temperature cured, because sometimes you got 50 plies of carbon fiber… Carbon fiber is really carbon string and glue. In order to have high strength, you need an autoclave. Something that's essentially a high pressure oven. If you have something that's gigantic, that one's got to be bigger than the rocket. We were trying to make an autoclave that's bigger than any autoclave that's ever existed. Or you can do room temperature cure, which takes a long time and has issues. The final issue is that we were just making very slow progress with carbon fiber.

Host: The meta question is why it had to be you who made that decision. There's many engineers on your team. How did the team not arrive at steel?

Elon Musk: Yeah exactly. This is part of a broader question, understanding your comparative advantage at your companies.

Elon Musk: Because we were making very slow progress with carbon fiber, I was like, "Okay, we've got to try something else." For the Falcon 9, the primary airframe is made of aluminum lithium, which has a very good strength-to-weight. Actually, it has about the same, maybe better, strength to weight for its application than carbon fiber. But aluminum lithium is very difficult to work with. In order to weld it, you have to do something called friction stir welding, where you join the metal without entering the liquid phase. It's kind of wild that you can do that. But with this particular type of welding, you can do that. It's very difficult. Let's say you want to make a modification or attach something to aluminum lithium, you now have to use a mechanical attachment with seals. You can't weld it on. So I wanted to avoid using aluminum lithium for the primary structure for Starship.

Elon Musk: There was this very special grade of carbon fiber that had very good mass properties. With a rocket, you're really trying to maximize the percentage of the rocket that is propellant, minimize the mass obviously. But like I said, we were making very slow progress. I said, "at this rate, we’re never going to get to Mars. So we've got to think of something else." I didn't want to use aluminum lithium because of the difficulty of friction stir welding, especially doing that at scale. It was hard enough at 3.6 meters in diameter, let alone at 9 meters or above. Then I said, "what about steel?" I had a clue here because some of the early US rockets had used very thin steel. The Atlas rockets had used a steel balloon tank. It's not like steel had never been used before. It actually had been used. When you look at the material properties of stainless steel, full-hard, strain hardened stainless steel, at cryogenic temperature the strength to weight is actually similar to carbon fiber.

Elon Musk: If you look at material properties at room temperature, it looks like the steel is going to be twice as heavy. But if you look at the material properties at cryogenic temperature of full-hard steel, stainless of particular grades, then you actually get to a similar strength to weight as carbon fiber. In the case of Starship, both the fuel and the oxidizer are cryogenic. For Falcon 9, the fuel is rocket propellant-grade kerosene, basically a very pure form of jet fuel. That is roughly room temperature. Although we do actually chill it slightly below, we chill it like a beer.

Host: Delicious.

Elon Musk: We do chill it, but it's not cryogenic. In fact, if we made it cryogenic, it would just turn to wax. But for Starship, it's liquid methane and liquid oxygen. They are liquid at similar temperatures. Basically, almost the entire primary structure is at cryogenic temperature. So then you've got a 300-series stainless that's strain hardened. Because almost all things are cryogenic temperature, it actually has similar strength to weight as carbon fiber. But it costs 50x less in raw material and is very easy to work with. You can weld stainless steel outdoors. You could smoke a cigar while welding stainless steel. It's very resilient. You can modify it easily. If you want to attach something, you just weld it right on. Very easy to work with, very low cost. Like I said, at cryogenic temperature, it’s similar strength-to-weight to carbon fiber.

Elon Musk: Then when you factor in that we have a much reduced heat shield mass, because the melting point of steel, is much greater than the melting point of aluminum… It's about twice the melting point of aluminum.

Host: So you can just run the rocket much hotter?

Elon Musk: Yes, especially for the ship which is coming in like a blazing meteor. You can greatly reduce the mass of the heat shield. You can cut the mass of the windward part of the heat shield, maybe in half, and you don't need any heat shielding on the leeward side. The net result is that actually the steel rocket weighs less than the carbon fiber rocket, because the resin in the carbon fiber rocket starts to melt. Basically, carbon fiber and aluminum have about the same operating temperature capabilities, whereas steel can operate at twice the temperature. These are very rough approximations. I won't build the rocket.

Elon Musk: What I mean is people will say, "Oh, he said this twice. It's actually 0.8." I'm like, shut up, assholes. That's what the main comment's going to be about. God damn it. The point is, in retrospect, we should have started with steel in the beginning. It was dumb not to do steel.

Host: Okay, but to play this back to you, what I'm hearing is that steel was a riskier, less proven path, other than the early US rockets. Versus carbon fiber was a worse but more proven out path. So you need to be the one to push for, "Hey, we're going to do this riskier path and just figure it out." So you're fighting a sort of conservatism in a sense.

Elon Musk: That's why I initially said that the issue is that we weren't making fast enough progress. We were having trouble making even a small barrel section of the carbon fiber that didn't have wrinkles in it. Because at that large scale, you have to have many plies, many layers of the carbon fiber. You've got to cure it and you've got to cure it in such a way that it doesn't have any wrinkles or defects. Carbon fiber is much less resilient than steel. It has much less toughness. Stainless steel will stretch and bend, the carbon fiber will tend to shatter.

Host: Toughness being the area under the stress strain curve.

Elon Musk: You're generally going to have to do better with steel, but stainless steel to be precise.

Host: One other Starship question. So I visited Starbase, I think it was two years ago, with Sam Teller, and that was awesome. It was very cool to see, in a whole bunch of ways. One thing I noticed was that people really took pride in the simplicity of things, where everyone wants to tell you how Starship is just a big soda can, and we're hiring welders, and if you can weld in any industrial project, you can weld here. But there's a lot of pride in the simplicity.

Elon Musk: Well, factually Starship is a very complicated rocket.

Host: So that's what I'm getting at. Are things simple or are they complex?

Elon Musk: I think maybe just what they're trying to say is that you don't have to have prior experience in the rocket industry to work on Starship. Somebody just needs to be smart and work hard and be trustworthy and they can work on a rocket. They don't need prior rocket experience. Starship is the most complicated machine ever made by humans, by a long shot.

Host: In what regards?

Elon Musk: Anything, really. I'd say there isn't a more complex machine. I'd say that pretty much any project I can think of would be easier than this. That's why nobody has ever made a fully reusable orbital rocket. It's a very hard problem. Many smart people have tried before, very smart people with immense resources, and they failed. And we haven't succeeded yet. Falcon is partially reusable, but the upper stage is not. Starship Version 3, I think this design can be fully reusable. That full reusability is what will enable us to become a multi-planet civilization. Any technical problem, even like a Hadron Collider or something like that, is an easier problem than this.

Host: We spent a lot of time on bottlenecks. Can you say what the current Starship bottlenecks are, even at a high level?

Elon Musk: Trying to make it not explode, generally. It really wants to explode.

Host: That old chestnut. All those combustible materials.

Elon Musk: We've had two boosters explode on the test stand. One obliterated the entire test facility. So it only takes that one mistake. The amount of energy contained in a Starship is insane.

Host: Is that why it's harder than Falcon? It's because it's just more energy?

Elon Musk: It's a lot of new technology. It's pushing the performance envelope. The Raptor 3 engine is a very, very advanced engine. It's by far the best rocket engine ever made. But it desperately wants to blow up.

Elon Musk: Just to put things into perspective here, on liftoff the rocket is generating over 100 gigawatts of power. That’s 20% of US electricity. It's actually insane.

Host: It's a great comparison.

Elon Musk: While not exploding.

Host: Sometimes.

Elon Musk: Sometimes, yes. So I was like, how does it not explode? There's thousands of ways that it could explode and only one way that it doesn't. So we want it not only to really not explode, but fly reliably on a daily basis, like once per hour. Obviously, if it blows up a lot, it's very difficult to maintain that launch cadence.

Host: Yes.

Host: What's the single biggest remaining problem for Starship?

Elon Musk: It's having the heat shield be reusable. No one's ever made a reusable orbital heat shield. So the heat shield's gotta make it through the ascent phase without shucking a bunch of tiles, and then it's gotta come back in and also not lose a bunch of tiles or overheat the main airframe.

Host: Isn't that hard because it's fundamentally a consumable?

Elon Musk: Well, yes, but your brake pads in your car are also consumable, but they last a very long time.

Host: Fair.

Elon Musk: So it just needs to last a very long time. We have brought the ship back and had it do a soft landing in the ocean. We've done that a few times. But it lost a lot of tiles. It was not reusable without a lot of work. Even though it did come to a soft landing, it would not have been reusable without a lot of work. So it's not really reusable in that sense. That's the biggest problem that remains, a fully reusable heat shield. You want to be able to land it, refill propellant and fly again. You can't do this laborious inspection of 40,000 tiles type of thing.

Host: When I read biographies of yours, it seems like you're just able to drive the sense of urgency and drive the sense of "this is the thing that can scale." I'm curious why you think other organizations of your… SpaceX and Tesla are really big companies now. You're still able to keep that culture. What goes wrong with other companies such that they're not able to do that?

Elon Musk: I don't know.

Host: Like today, you said you had a bunch of SpaceX meetings. What is it that you're doing there that's keeping that?

Host: It’s adding urgency?

Elon Musk: Well, I don't know. I guess the urgency is going to come from whoever is leading the company. I have a maniacal sense of urgency. So that maniacal sense of urgency projects through the rest of the company.

Host: Is it because of consequences? They're like, "Elon set a crazy deadline, but if I don't get it, I know what happens to me." Is it just that you're able to identify bottlenecks and get rid of them so people can move fast? How do you think about why your companies are able to move fast?

Elon Musk: I'm constantly addressing the limiting factor. On the deadlines front, I generally actually try to aim for a deadline that I at least think is at the 50th percentile. So it's not like an impossible deadline, but it's the most aggressive deadline I can think of that could be achieved with 50% probability. Which means that it'll be late half the time. There is a law of gas expansion that applies to schedules. If you said we're going to do something in five years, which to me is like infinity time, it will expand to fill the available schedule and it'll take five years. Physics will limit how fast you can do certain things. So scaling up manufacturing, there's a rate at which you can move the atoms and scale manufacturing. That's why you can't instantly make a million units a year of something. You've got to design the manufacturing line. You've got to bring it up. You've got to ride the S-curve of production. What can I say that's actually helpful to people? Generally, a maniacal sense of urgency is a very big deal. You want to have an aggressive schedule and you want to figure out what the limiting factor is at any point in time and help the team address that limiting factor.

Host: So Starlink was slowly in the works for many years. We talked about it all the way in the beginning of the company. So then there was a team you had built in Redmond, and then at one point you decided this team is just not cutting it. It went for a few years slowly, and so why didn't you act earlier, and why did you act when you did? Why was that the right moment at which to act?

Elon Musk: I have these very detailed engineering reviews weekly. That's maybe a very unusual level of granularity. I don't know anyone who runs a company, or at least a manufacturing company, that goes with the level of detail that I go into. It's not as though... I have a pretty good understanding of what's actually going on because we go through things in detail. I'm a big believer in skip-level meetings where instead of having the person that reports to me say things, it's everyone that reports to them saying something in the technical review. And there can't be advanced preparation. Otherwise you're going to get "glazed", as I say these days.

Host: Exactly. Very Gen Z of you. How do you prevent advanced preparation? Do you call on them randomly?

Elon Musk: No, I just go around the room. Everyone provides an update. It's a lot of information to keep in your head. If you have meetings weekly or twice weekly, you've got a snapshot of what that person said. You can then plot the progress points. You can sort of mentally plot the points on a curve and say, "are we converging to a solution or not?" I'll take drastic action only when I conclude that success is not in a set of possible outcomes. So when I finally reach the conclusion that unless drastic action is done, we have no chance of success, then I must take drastic action. I came to that conclusion in 2018, took drastic action and fixed the problem.

Host: You've got many, many companies. In each of them it sounds like you do this kind of deep engineering understanding of what the relevant bottlenecks are so you can do these reviews with people. You've been able to scale it up to five, six, seven companies. Within one of these companies, you have many different mini companies within them. What determines the max amount here? Because you have like 80 companies…?

Elon Musk: 80? No.

Host: But you have so many already. That's already remarkable.

Elon Musk: By this current number.

Host: Exactly.

Elon Musk: We can barely keep one company together. It depends on the situation. I actually don't have regular meetings with The Boring Company, so The Boring Company is sort of cruising along. Basically, if something is working well and making good progress, then there's no point in me spending time on it. I actually allocate time according to where the limiting factor. Where are things problematic? Where are we pushing against? What is holding us back? I focus, at the risk of saying the words too many times, on the limiting factor. The irony is if something's going really well, they don't see much of me. But if something is going badly, they'll see a lot of me. Or not even badly…

Host: If something is the limiting factor.

Elon Musk: The limiting factor, exactly. It’s not exactly going badly but it’s the thing that we need to make go faster.

Host: When something’s a limiting factor at SpaceX or Tesla, are you talking weekly and daily with the engineer that's working on it? How does that actually work?

Elon Musk: Most things that are the limiting factor are weekly and some things are twice weekly. The AI5 chip review is twice weekly. Every Tuesday and Saturday is the chip review.

Host: Is it open ended in how long it goes?

Elon Musk: Technically, yes, but usually it's two or three hours. Sometimes less. It depends on how much information we've got to go through.

Host: That's another thing. I'm just trying to tease out the differences here because the outcomes seem quite different. I think it's interesting to know what inputs are different. It feels like in the corporate world, one, like you were saying, the CEO doing engineering reviews does not always happen despite the fact that that is what the company is doing. But then time is often pretty finely sliced into half hour meetings or even 15 minute meetings. It seems like you hold more open-ended, "We're talking about it until we figure it out" type things.

Elon Musk: Sometimes. But most of them seem to more or less stay on time. Today's Starship engineering review went a bit longer because there were more topics to discuss. They're trying to figure out how to scale to a million plus tons to orbit per year. It’s quite challenging.

Host: Can I ask a question? You said about Optimus and AI that they're going to result in double digit growth rates within a matter of years.

Elon Musk: Oh, like the economy? Yes. I think that's right.

Host: What was the point of the DOGE cuts if the economy is going to grow so much?

Elon Musk: Well, I think waste and fraud are not good things to have. I was actually pretty worried about... In the absence of AI and robotics, we're actually totally screwed because the national debt is piling up like crazy. The interest payments to national debt exceed the military budget, which is a trillion dollars. So we have over a trillion dollars just in interest payments. I was pretty concerned about that. Maybe if I spend some time, we can slow down the bankruptcy of the United States and give us enough time for the AI and robots to help solve the national debt. Or not help solve, it's the only thing that could solve the national debt. We are 1000% going to go bankrupt as a country, and fail as a country, without AI and robots. Nothing else will solve the national debt. We just need enough time to build the AI and robots to not go bankrupt before then.

Host: I guess the thing I'm curious about is, when DOGE starts you have this enormous ability to enact reform.

Elon Musk: Not that enormous.

Host: Sure. I totally buy your point that it's important that AI and robotics drive productivity improvements, drive GDP growth. But why not just directly go after the things you were pointing out, like the tariffs on certain components, or permitting?

Elon Musk: I'm not the president. And it is very hard to cut things that are obvious waste and fraud, like ridiculous waste and fraud. What I discovered is that it's extremely difficult even to cut very obvious waste and fraud from the government because the government has to operate on who's complaining. If you cut off payments to fraudsters, they immediately come up with the most sympathetic sounding reasons to continue the payment. They don't say, "Please keep the fraud going." They’re like, "You're killing baby pandas." Meanwhile, no baby pandas are dying. They're just making it up. The fraudsters are capable of coming up with extremely compelling, heart-wrenching stories that are false, but nonetheless sound sympathetic. That's what happened. Perhaps I should have known better. But I thought, wait, let's try to cut some amount of waste and pork from the government. Maybe there shouldn't be 20 million people marked as alive in Social Security who are definitely dead, and over the age of 115. The oldest American is 114. So it's safe to say if somebody is 115 and marked as alive in the Social Security database, there's either a typo… Somebody should call them and say, "We seem to have your birthday wrong, or we need to mark you as dead." One of the two things.

Host: Very intimidating call to get.

Elon Musk: Well, it seems like a reasonable thing. Say if their birthday is in the future and they have a Small Business Administration loan, and their birthday is 2165, we either have a typo or we have fraud. So we say, "we appear to have gotten the century of your birth incorrect."

Host: Or a great plot for a movie.

Elon Musk: Yes. That's what I mean by, ludicrous fraud.

Host: Were those people getting payments?

Elon Musk: Some were getting payments from Social Security. But the main fraud vector was to mark somebody as alive in Social Security and then use every other government payment system to basically do fraud. Because what those other government payment systems do, they would simply do an "are you alive" check to the Social Security database. It's a bank shot.

Host: What would you estimate is the total amount of fraud from this mechanism?

Elon Musk: By the way, the Government Accountability Office has done these estimates before. I'm not the only one. In fact, I think the GAO did an analysis, a rough estimate of fraud during the Biden administration, and calculated it at roughly half a trillion dollars. So don't take my word for it. Take a report issued during the Biden administration. How about that?

Host: From this Social Security mechanism?

Elon Musk: It's one of many. It's important to appreciate that the government is very ineffective at stopping fraud. It's not like a company where, with stopping fraud, you've got a motivation because it's affecting the earnings of your company. The government just prints more money. You need caring and competence. These are in short supply at the federal level. When you go to the DMV, do you think, "Wow, this is a bastion of competence"?

Elon Musk: Well, now imagine it's worse than the DMV because it's the DMV that can print money. At least the state level DMVs need to... The states more or less need to stay within their budget or they go bankrupt. But the federal government just prints more money.

Host: If there's actually half a trillion of fraud, why was it not possible to cut all that?

Elon Musk: You really have to stand back and recalibrate your expectations for competence. Because you'sre operating in a world where you've got to make ends meet. You've got to pay your bills...

Host: Find the microphones.

Elon Musk: Exactly. It's not like there's a giant, largely uncaring monster bureaucracy. It's a bunch of anachronistic computers that are just sending payments. One of the things that the DOGE team did sounds so simple and probably will save $100-200 billion a year. It was simply requiring payments from the main Treasury computer—which is called PAM, Payment Accounts Master or something like that, there's $5 trillion payments a year—that go out have a payment appropriation code. Make it mandatory, not optional, that you have anything at all in the comment field. You have to recalibrate how dumb things are. Payments were being sent out with no appropriation code, not checking back to any congressional appropriation, and with no explanation. This is why the Department of War, formerly the Department of Defense, cannot pass an audit, because the information is literally not there. Recalibrate your expectations.

Host: I want to better understand this half a trillion number, because there's an IG report in 2024. Why is it so low?

Elon Musk: Maybe, but we found that over seven years, the Social Security fraud they estimated was like $70 billion over seven years, so like $10 billion a year. So I'd be curious to see what the other $490 billion is.

Elon Musk: Federal government expenditures are $7.5 trillion a year. How competent do you think the government is?

Host: The discretionary spending there is like… 15%?

Elon Musk: But it doesn't matter. Most of the fraud is non-discretionary. It's basically fraudulent Medicare, Medicaid, Social Security, disability. There's a zillion government payments. A bunch of these payments are in fact block transfers to the states. So the federal government doesn't even have the information in a lot of cases to even know if there's fraud. Let's consider reductio ad absurdum. The government is perfect and has no fraud. What is your probability estimate of that? Zero.

Host: Okay, so then would you say, fraud and waste at the government is 90% efficient?

Elon Musk: That also would be quite generous. But if it's only 90%, that means that there's $750 billion a year of waste and fraud. And it's not 90%. It's not 90% effective.

Host: This seems like a strange way to first principles the amount of fraud in the government. Just like, how much do you think there is? Anyways, we don't have to do it live, but I'd be curious—

Host: You know a lot about fraud at Stripe?

Elon Musk: People are constantly trying to do fraud.

Host: Yeah, but as you say, it's a little bit of a... We've really ground it down, but it's a little bit of a different problem space because you're dealing with a much more heterogeneous set of fraud vectors here than we are.

Elon Musk: But at Stripe, you have high competence and you try hard.

Elon Musk: You have high competence and high caring, but still fraud is non-zero. Now imagine it's at a much bigger scale, there's much less competence, and much less caring. At PayPal back in the day, we tried to manage fraud down to about 1% of the payment volume. That was very difficult. It took a tremendous amount of competence and caring to get fraud merely to 1%. Now imagine that you're an organization where there's much less caring and much less competence. It's going to be much more than 1%.

Host: How do you feel now looking back on politics and doing stuff there? Looking from the outside in, two things have been quite impactful: one, the America PAC, and two, the acquisition of Twitter at the time. But also it seems like there was a bunch of heartache. What's your grading of the whole experience?

Elon Musk: I think those things needed to be done to maximize the probability that the future is good. Politics generally is very tribal. People lose their objectivity usually with politics. They generally have trouble seeing the good on the other side or the bad on their own side. That's generally how it goes. That, I guess, was one of the things that surprised me the most. You often simply cannot reason with people. If they're in one tribe or the other. They simply believe that everything their tribe does is good and anything the other political tribe does is bad. Persuading them otherwise is almost impossible. But I think overall those actions—acquiring Twitter, getting Trump elected, even though it makes a lot of people angry—I think those actions were good for civilization.

Host: How does it feed into the future you're excited about?

Elon Musk: Well, America needs to be strong enough to last long enough to extend life to other planets and to get AI and robotics to the point where we can ensure that the future is good. On the other hand, if we were to descend into, say, communism or some situation where the state was extremely oppressive, that would mean that we might not be able to become multi-planetary. The state might stamp out our progress in AI and robotics.

Elon Musk: Optimus, Grok, et cetera. Not just yours, but any revenue-maximizing company's products will be leveraged by the government over time.