How the ‘Nostradamus of AI’ Got It Wrong

Summary

Podcast Summary: The Journal – "How the ‘Nostradamus of AI’ Got It Wrong"
Date: August 4, 2026
Hosts: Ryan Knudsen & Gregory Zuckerman (The Wall Street Journal)

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Overview

This episode dives into the meteoric rise and dramatic near-fall of Leopold Aschenbrenner, a 24-year-old dubbed the "Nostradamus of AI." Once hailed as a visionary hedge fund manager with a Midas touch for predicting trends in artificial intelligence, Aschenbrenner’s fund, Situational Awareness, spectacularly melted down just as he prepared for his high-profile Silicon Valley wedding. The show traces how his reputation as a clairvoyant attracted billions, but classic errors in risk management brought him—and many elite backers—crashing back to earth.

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Key Discussion Points

1. The Wedding as a Microcosm of Silicon Valley Hype (00:05–01:56)

• Leopold Aschenbrenner's wedding becomes the social event of the season for tech executives and investors.
• Unusual format: "It wasn't the kind of wedding that many of us experienced. There were no gifts, for one... And there were breakout sessions, sort of like a conference, a TED Talk kind of thing." – Gregory Zuckerman (01:30)
• The wedding’s mood is shadowed by turmoil as Aschenbrenner’s hedge fund collapses in real-time: "Behind the scenes, his hedge fund was melting down. It was collapsing. It was imploding." – Zuckerman (02:02)

2. Leopold Aschenbrenner: From Prodigy to AI Oracle (04:11–08:33)

• Early life: German-born, Columbia University grad, top standardized test scores, stints at high-profile companies (FTX, OpenAI).
• Fired from OpenAI, allegedly for sharing sensitive info with Anthropic—a claim he disputes, saying, "It was totally normal at OpenAI at the time to share sort of safety ideas with external researchers for feedback." – Leopold Aschenbrenner (05:52)
• Achieves fame through a 165-page essay, “Situational Awareness: The Decade Ahead,” forecasting AI’s trajectory and making bold claims about having “the best situational awareness in the business.” (06:48)

3. The Allure and Anatomy of Situational Awareness Fund (09:01–11:44)

• Hedge fund sells exclusivity: $25M minimum investment; investments in up-and-coming AI firms, private companies like Anthropic.
• Access to such deals fueled by Aschenbrenner’s deep connections – possibly including marriage ties to Anthropic’s CEO's chief of staff.
• Aggressive leverage: The fund borrows 3–4x assets—amplifying both gains and losses.
• Early results: Astounding performance, fund swells to $45B, "trouncing public markets."

4. Classic Hedge Fund Failure: Over-leverage Meets Volatility (12:22–18:26)

• 2026 AI market jitters: Investors question the profitability of big AI bets; cheaper Chinese AI models stoke further unease.
• Single-company risk—SK Hynix (South Korean chipmaker)—goes public, stock drops, triggers sector-wide reevaluation and defaults.
• Margin calls: Banks and brokers demand more collateral; Aschenbrenner scrambles for liquidity as portfolio value drops.
  • "One bad week can lead to a margin call. And that's kind of what happened." – Zuckerman (18:26)

5. Rescue and Aftermath: Ken Griffin & Citadel Step In (16:01–18:26)

• Market sharks circle; Citadel’s Ken Griffin seizes the opportunity, buys Aschenbrenner’s non-Anthropic stakes at a >10% discount.
  • “Citadel executives got in touch, said, ‘Hey, you seem to need some cash. We can be helpful.’” – Zuckerman (16:43)
• Situational Awareness is forced to sell most holdings but keeps Anthropic shares.
• Fund shrinks to $10B; Aschenbrenner sends a letter to investors: “We let you down this month. I take full responsibility for these events.” (17:42)

6. Reputation and Resilience in the Valley (19:01–20:50)

• Despite the flame-out, tech and finance elites may still hold Aschenbrenner in high regard.
  • “There's a sort of almost credibility and respect people have for those who've lost billions. You'd be shocked.” – Zuckerman (19:19)
• Suggests a "badge of honor" culture around spectacular failures: "There's this weird assumption that if you've lost a lot of money on Wall Street, it means you can actually make a lot of money the next time." – Zuckerman (19:52)
• Aschenbrenner remains at the helm, with a loyal core believing in a comeback.

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Notable Quotes & Memorable Moments

• “Aschenbrenner is 24 years old, and just days before his wedding, he was running a hedge fund worth $45 billion.” – Knudsen (01:15)
• “Older wealthy individuals...are always looking to the next generation...because it's changing so rapidly.” – Zuckerman (07:45)
• “He really looked like he had a bright future ahead...and it all turned around really quickly.” – Zuckerman (11:44)
• “It was a pretty basic lesson from the past that he missed. Don't over lever yourself, especially in a volatile part of the market.” – Zuckerman (18:11)
• “You get a little respect in some circles for losing a ton of money really quickly...remarkable phenomenon.” – Zuckerman (19:52)

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Key Timestamps for Important Segments

• 00:05–01:56 – Silicon Valley wedding and immediate fund crisis
• 04:11–08:33 – Aschenbrenner’s background, reputation, and the rise to AI prominence
• 09:01–11:44 – Inside the fund’s strategy, exclusivity, and risky leverage
• 12:22–14:41 – Market jitters, SK Hynix downfall, margin calls begin
• 16:01–17:35 – Citadel’s intervention and the rapid fire sale
• 17:42–18:26 – Investor mea culpa and financial lesson
• 19:01–20:50 – Reflections: Valley culture towards risky bets and the future for Aschenbrenner

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Tone and Takeaways

In the signature, incisive-yet-accessible tone of The Journal, the episode paints a cautionary tale: blind faith in prodigies and bold prophecies can still founder on the rocks of age-old financial errors. The saga also highlights Silicon Valley’s unique optimism—even loss, on a grand scale, is often seen as a rite of passage rather than a career-ending event.

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For listeners: Even if you missed the AI fund gold rush, the classic advice still applies—never bet the house on tomorrow’s tech, no matter how shiny the oracle.

Transcript

[Ryan Knudsen]

Last week, there was a wedding. The setting, a coastal town in Northern California. How big of an affair was this going to be?

[Gregory Zuckerman]

This was the event of the Silicon Valley summer. There were all kinds of top AI and other tech investors and executives coming. It was sort of the place to be. You wanted to see and be seen there.

[Ryan Knudsen]

The bride was the chief of staff to the CEO of Anthropic, and the groom was an investing wunderkind named Leopold Aschenbrenner. So if I had asked you a month ago, who is Leopold Aschenbrenner, how would you answer that question?

[Gregory Zuckerman]

A month ago, there was a consensus that. That Leo Aschenbrenner was a Nostradamus of some sorts, of the AI age.

[Ryan Knudsen]

Our colleague Gregory Zuckerman covers business and investing.

[Gregory Zuckerman]

He was young, made predictions. Some of them seemed to come true. He had vision. People deferred to him, so they gave him a lot of money.

[Ryan Knudsen]

Aschenbrenner is 24 years old, and just days before his wedding, he was running a hedge fund worth $45 billion. But this was not like, also a normal wedding. Right. There was like some other features.

[Gregory Zuckerman]

It wasn't the kind of wedding that many of us experienced. There were no gifts, for one. He didn't need the gifts. And there were breakout sessions, sort of like a conference, a TED Talk kind of thing. There were interesting people, smart people going to be there. You want to hear from them.

[Ryan Knudsen]

It was like a wedding business conference.

[Gregory Zuckerman]

Yeah, there were a conference colloquiums. So it sounds like a fun, interesting kind of event. I would have liked to have been invited.

[Ryan Knudsen]

But in the lead up to the grand event, there was some serious trouble brewing for Aschenbrenner's fund.

[Gregory Zuckerman]

Bit of an understatement. Yeah. So he was counting down to his wedding, as for the guests and his beautiful bride. But behind the scenes, his hedge fund was melting down. It was collapsing. It was imploding.

[Ryan Knudsen]

So your hedge fund melting down, is that worse than rain on your wedding day?

[Gregory Zuckerman]

It's a little bit worse.

[Ryan Knudsen]

Investors thought Aschenbrenner was kind of clairvoyant, that he could guide them through a confusing time. But it turned out Aschenbrenner made a textbook mistake that brought his mighty hedge fund crashing down. Welcome to the Journal, our show about money, business and power. I'm Ryan knudsen. It's Tuesday, August 4th. Coming up on the show, what the Nostradamus of AI got wrong.

[Sponsor Announcer]

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[Ryan Knudsen]

Before he was anointed as an investing prodigy, Leopold Aschenbrenner had a resume that looked tailor made for a career in the tech world.

[Gregory Zuckerman]

So Leo Aschenbrenner grew up in Germany, came to Columbia University, did exceedingly well in school. He subsequently put on his LinkedIn. He was proud that his LSAT score was like better than 99.4%. I think of every other score he was proud of that. I personally have not listed my SAT scores, shared them in many years.

[Ryan Knudsen]

I personally will not share my SAT scores.

[Gregory Zuckerman]

Thank you.

[Ryan Knudsen]

Right after college, Aschenbrenner moved from one buzzy startup to he worked at among

[Gregory Zuckerman]

the most important and influential and controversial companies out there. He worked at ftx, the Sam Bankman fried startup, which became a crypto power and then imploded. And then imploded. Right Tonight, the cryptocurrency world is reeling

[Sponsor Announcer]

after the meltdown of one of its

[Gregory Zuckerman]

most popular trading platforms.

[Sponsor Announcer]

One of the largest exchanges in the

[Ryan Knudsen]

world, ftx, collapsed this week after it. After a stint at ftx, Aschenbrenner went to work for one of the premier tech powerhouses.

[Gregory Zuckerman]

He went to Sam Altman's OpenAI, worked on the safety side of things, which is quite important.

[Ryan Knudsen]

In 2024, OpenAI fired Aschenbrenner, claiming that he leaked sensitive company information to the husband of an executive at their main rival, Anthropic. Aschenbrenner didn't respond to requests for comment, but he did talk about his firing from OpenAI in a 2024 podcast interview. He said he wrote and shared a brainstorming document on AI safety.

[Leopold Aschenbrenner]

You know, I think for context, it was totally normal at OpenAI at the time to share sort of safety ideas with external researchers for feedback. You know, it happened all the time.

[Ryan Knudsen]

Aschenbrenner's big break came next when he wrote a 165 page essay called Situational Awareness the Decade Ahead. It was a manifesto on the future that went viral in tech circles.

[Gregory Zuckerman]

Yeah, so he made the argument that he is among the few who has situational awareness, meaning he understands where we are in this economy, how things are transitioning, the importance of AI, where things are going. And there are very few people with that quote, unquote, situational awareness or that ability to predict the future.

[Ryan Knudsen]

The manifesto propelled Aschenbrenner to Silicon Valley fame and helped him raise money for his next venture, a hedge fund that would invest based on his ideas about the future. Here's Aschenbrenner again.

[Leopold Aschenbrenner]

Basically the thing this investment firm will be, will be kind of like, you know, bring trust on AI. It's going to be all about situational awareness. We're going to have the best situational awareness in the business. We're going to have way more situational business than any of the people who manage money in New York. We're definitely going to, you know, we're going to do great on investing.

[Ryan Knudsen]

But Aschenbrenner named his hedge fund Situational Awareness. Why would anybody believe that this guy knows what's coming in the decade ahead?

[Gregory Zuckerman]

Well, listen, we're all looking for direction and guidance. And it's not just you and I and the masses, even the stars in Silicon Valley are kind of confused. One day AI is going to take all our jobs away. Next day they're predicting that it won't affect the job market. They're as confused as anybody. And it's because it's a, it's a novel technology.

[Ryan Knudsen]

Greg says that in his decades of covering Wall street, he's noticed that more seasoned investors tend to look to smart young people for ideas.

[Gregory Zuckerman]

Older wealthy individuals, investors and others, executives and such are always looking to the next generation, to the younger generation, for predictions, for guidance, for some direction about where this world is going. Because it's really changing so rapidly. And we're aware of, we older people are aware that we don't really have our finger on the pulse. And here was this young, well versed, intelligent individual who presents really well. He came to guide us all.

[Ryan Knudsen]

Yeah, everyone's looking for guidance. He sort of presented himself like an AI messiah, almost like, I see where things are headed, I see the future.

[Gregory Zuckerman]

Yeah, he was seen as something of a Nostradamus.

[Ryan Knudsen]

And if Aschenbrenner was an oracle. The novel length situational awareness essay was his prophecy.

[Gregory Zuckerman]

I mean, he's 24 years old, people entrust him with billions and billions of dollars. Just a few years out of college, it wouldn't seem to make sense. But even hedge fund managers and Silicon Valley executives and such, in the quiet moments of their lives, they're confused. So for someone out there to speak with confidence and anticipate the future is. It's something that people embrace.

[Ryan Knudsen]

So we found situational awareness. This hedge fund talk about its investment strategy.

[Gregory Zuckerman]

So they bought private investments, companies that are not yet public, such as Anthropic, and they had the ability to get in on some of these early investments, which is something of a coup. Now people are searching, investors are searching for the ability to get in early on these up and coming future powers like Anthropic. So he had that ability partly because of the document, partly because he was really well connected.

[Ryan Knudsen]

So investing with him was sort of a way to invest in Anthropic when you can't currently do that because Anthropic is not publicly traded.

[Gregory Zuckerman]

Yes.

[Ryan Knudsen]

Do we know how he was able to get that stake in Anthropic?

[Gregory Zuckerman]

So it's not clear. He's really well connected. There are all kinds of either suspicions or suggestions, and they're not really accusations. It didn't do anything improper. Anthropic is allowed to sell stakes to anyone it wants to. But he leveraged his access.

[Ryan Knudsen]

Yeah, and I, and we did, we did mention earlier that he just married the CEO's chief of staff. So that might have been helpful.

[Gregory Zuckerman]

Doesn't hurt.

[Ryan Knudsen]

The fund felt exclusive, partly because in order to get in, you had to spend a lot of money.

[Gregory Zuckerman]

So the minimum investment was $25 million, which is a lot in that world. It's not unheard of, but it's substantial check. So you're really only getting people who can afford it. And that's often, in this case anyway, sort of a who's who in the world of Silicon Valley.

[Ryan Knudsen]

The fund's portfolio also included more traditional stuff like stocks and options. And like other hedge funds, situational awareness leveraged its positions to go even bigger on its investments.

[Gregory Zuckerman]

So every hedge fund out there uses leverage to some extent. They borrow money basically to amplify their bets. Often it's, you go to a bank and you borrow money. You say, I've got a dollar of investment money. Hey, can I borrow against that? You put a dollar into the market. Usually in his case, he was getting three or four dollars of lending of Borrowed money from banks. And that really works on the way up. So as opposed to you investing a dollar in the market and then it doubles and you've got $2, if you borrow three, $4 on top of that dollar and it all goes up, you multiply your returns, obviously, you also multiply your losses when things turn around and you have a setback.

[Ryan Knudsen]

And how is the fund performing in the early days?

[Gregory Zuckerman]

So the fund was killing it. I mean, it was outperforming most any other rival out there. He was doing really well, both based on the growth of his private investments, like Anthropic, but also the public ones. I mean, he grew this thing to $45 billion. He was trouncing public markets and seemed like he was on his way to creating a hedge fund power. So he really looked like he had a bright future ahead of him. And it all turned around really quickly.

[Ryan Knudsen]

The situation that Ashton Brenner was unaware of, that's next. As of July, Situational Awareness had been a hedge fund for less than two years, but it was already managing a portfolio of more than $45 billion. And then just days ago, things started to get shaky. Where does the trouble start?

[Gregory Zuckerman]

So it started when people, investors started having second thoughts about many of the hyperscalers and other types of AI related companies. The thinking being, well, where are the returns? A lot of the biggest AI related companies for the first time ever are going to the debt markets and they're borrowing money. And people are kind of now at the point where they're saying, well, yeah, you're talking about big returns, but when are we going to get those returns?

[Ryan Knudsen]

Wall street has been worried about the amount of money that AI companies are borrowing before they prove they can be profitable in the long term. And some recent developments have made those anxieties worse. Cheaper AI models from China spooked Silicon Valley and raised questions about where the best value lies for AI. Is it in the supply chain chips, these overseas models?

[Gregory Zuckerman]

And as a result, some stocks have been hurt and they've been falling, especially those in his portfolio.

[Ryan Knudsen]

A lot of the trouble for situational awareness has been centered around a South Korean chip company called SK Hynix. The company recently went public and Aschenbrenner's fund had a huge stake.

[Gregory Zuckerman]

They came to the market, they sold new shares, People started having second thoughts about the stock. The stock went down. Some of the retail individual investors in South Korea started getting nervous and panicky and sold. So that stock went down. And that was part of the reason why Leo felt pressure.

[Ryan Knudsen]

So this South Korean chip company that situational awareness is backing takes a hit because there are these questions about investing in the AI supply chain. But how does that one company cause so much trouble for Aschenbrenner?

[Gregory Zuckerman]

So SK Hynix sparked a reexamination of all kinds of AI type stocks. As a result, his stock portfolio started taking on water suddenly, quickly. And in this world, you get a margin call.

[Ryan Knudsen]

For people who don't know what a margin call is, can you just explain that?

[Gregory Zuckerman]

Yeah, you borrow money from someone, there are terms involved. You've got collateral you put up, and they know your ability to pay back that loan. And when they see your portfolio shrinking, falling dramatically, 10, 15%, they right away say, hey, buddy, you've got to come up with new collateral for us.

[Ryan Knudsen]

What you put up, the collateral against this loan is now worth a lot less than it was when we issued this loan. So you need to get that. You need to get that collateral back up again so that we feel confident you'll repay this.

[Gregory Zuckerman]

Exactly. And that's what happened here. It was more than one call from brokers telling Leo, hey, you've got to come up with new collateral. And as a result, he had to quickly come up with new cash.

[Ryan Knudsen]

Last week, as Aschenbrenner's wedding neared, a flood of margin calls were coming into situational awareness. Essentially saying, you need to show us where you're going to get a lot of money and you need to do it fast.

[Gregory Zuckerman]

So a week or so ago, it became clear to traders, hedge funds, people in the market, the AI world, that this guy was suffering, that he was in some trouble and was gonna need cash. And that's where Ken Griffin and Citadel step in.

[Ryan Knudsen]

If Leopold Aschenbrenner represents Silicon Valley's flashy up and comers, Ken Griffin and his fund, Citadel, represent the steady hand of the old guard.

[Gregory Zuckerman]

They kind of smelled a blood in the water, made a call, said, hey, can we be helpful here?

[Ryan Knudsen]

How does this negotiation play out? How does Aschenbrenner respond to Citadel and Ken Griffin's outreach?

[Gregory Zuckerman]

So Citadel executives got in touch, said, hey, you seem to need some cash. We can be helpful. Aschenbrenner and his executives thought about what they should be doing. They mulled, they strategized, they debated.

[Ryan Knudsen]

And all of this is happening as Ashton Brenner is like, preparing for his wedding.

[Gregory Zuckerman]

Yes. Hopefully he's good at compartmentalizing. It's gotta be difficult to try to save your hedge fund while you're checking out tuxedos and such.

[Ryan Knudsen]

Well, past midnight on Wednesday, Situational Awareness reached a deal with Citadel. The fund would hang onto its valuable anthropic shares, but Situational Awareness would sell almost everything else to Citadel at a discount of more than 10%. That's according to a person familiar with the matter. Citadel has not publicly commented on the deal.

[Gregory Zuckerman]

They wrote a big check, handed it over to Aschenbrenner and his firm, and they were able to pay down their lenders.

[Ryan Knudsen]

The deal left Situational Awareness with a slimmed down portfolio, but one that's still valued at more than $10 billion. On Thursday, as guests were arriving for the wedding, Aschenbrenner sent a letter to investors explaining what was happening. We let you down this month, he wrote. I take full responsibility for these events.

[Gregory Zuckerman]

There was a bit of a mea culpa from Ashenbrenner apologizing for the losses. They won't happen again. We've learned our lesson.

[Ryan Knudsen]

Greg says there's a bit of irony in Aschenbrenner's story so far. For all his supposed insight into the future, it was a pretty basic lesson from the past that he missed. Don't over leverage yourself, especially in a volatile part of the market.

[Gregory Zuckerman]

There are all kinds of strategies when it comes to hedge funds, and people borrow more money if they're investing in bonds and other kinds of things. But if you're going to borrow a lot of money, you don't want to do it to buy stocks that are really volatile because one bad week can lead to a margin call. And that's kind of what happened. Everything would have been fine and he'd still be up a ton had he not borrowed so much money. And that's just an old school financial issue. It's always the leverage that gets hedge funds and other investors catches them in the end.

[Ryan Knudsen]

Do you think that this soured the mood at the wedding at all?

[Gregory Zuckerman]

This could not have been helpful to the spirit and mood of the wedding. I have a feeling, though, these are all wealthy investor types who've suffered in their own ways time and time again. I mean, if you look at SpaceX and Elon and all the others, there's a sort of almost credibility and respect people have for those who've lost billions. You'd be shocked. Time and time again I cover. I've written about investors who've cost their clients billions of dollars and they're pretty relaxed and calm and upbeat and not shaken. It's shocking to me.

[Ryan Knudsen]

It almost comes across as like a badge of honor.

[Gregory Zuckerman]

I feel like there's some element of Badge of honor here. Yeah, I'd be in a fetal position and embarrassed to show my face. But you get a little respect in some circles for losing a ton of money really quickly. It's a remarkable phenomenon. There's this weird assumption that if you've lost a lot of money on Wall street, it means you can actually make a lot of money the next time. And he has made a lot of money for investors, so a lot of his core clients are still confident in him, and he really could turn things around. He's stabilized his firm, and for all we know, he'll remain the Nostradamus of AI and keep growing his fur.

[Ryan Knudsen]

That's all for today. Tuesday, August 4th the Journal is a co production of Spotify and the Wall Street Journal. Additional reporting in this episode by Anissa Gardazzi, Berber Ginny and Peter Rudiger. Thanks for listening. See you tomorrow.