Greg Brockman takes the stand — and suddenly Musk’s case against OpenAI has some paper trail behind it. Welcome to Musk v Altman Daily. Today: betrayal, private journals, and a co-founder who apparently thought Elon Musk might actually swing at him. We’ve got Brockman’s testimony, a 2017 acquisition deal with some glaring disclosure problems, and the core question here — did OpenAI’s founders break the promises that got Musk’s money in the first place? A man’s private journal is evidence in federal court. Nothing about this story is normal. From Lily Jamali and Kali Hays at BBC News:
Brockman, a co-founder of OpenAI and a defendant in Musk's lawsuit attempting to undo its transition to a for-profit business, told a jury in Oakland federal court that when he rejected a proposal for Musk to have more say in the company, Musk's mood abruptly changed. "I actually thought he was going to hit me," Brockman said, referring to Musk.
Yesterday Greg Brockman was pushing back on Musk’s origin story from the stand — and today the jury heard it get a lot sharper. Brockman testified that when he turned down Musk’s push for more control in 2017, Musk’s demeanor changed so fast that Brockman, quote, thought he was going to hit him. A billionaire throwing a near-tantrum because he couldn’t own the AI company he helped fund — I mean, that’s basically the case in one anecdote, isn’t it? He wanted the keys, and nobody handed them over. BBC’s Lily Jamali and Kali Hays have the courtroom reporting here. And Devin, legally, the physical intimidation detail is color — what the jury actually cares about is the funding withdrawal that followed. Musk allegedly started withholding money the same day. That’s conduct, not just attitude. So when he doesn’t get control, he chokes off the funding? That’s not a co-founder move, that’s leverage. And now he’s in court trying to unwind the for-profit flip — same instinct, different courtroom. From WatcherGuru:
According to a filing submitted Sunday evening by OpenAI, Musk contacted OpenAI President Greg Brockman on April 25, two days before trial proceedings began in federal court in Oakland, California, “to gauge interest in settlement.” The timing matters. The trial could have major governance consequences for OpenAI, including the removal of CEO Sam Altman and Brockman from the company’s board if Musk succeeds.
So we’re two days before trial, and Musk is texting Greg Brockman to gauge settlement interest — then immediately warning that he and Altman will be, quote, the most hated men in America by Friday. That’s not a settlement overture. That’s a warning shot. And yesterday the settlement text itself was mostly sidelined — now OpenAI is using this new filing to make the whole case about Musk’s motive instead of their governance. That’s a pivot. It is a deliberate reframe, yes. The core legal question is still whether Musk can prove breach of charitable trust — but OpenAI is betting that if they can make this look like a competitor trying to kneecap a rival, the court’s equitable discretion swings their way. Which, honestly? Not a crazy read. The man owns xAI. He’s building a direct competitor. At some point “I’m protecting the nonprofit mission” starts sounding like “I want the keys back.” From OfficeChai:
Under oath on May 4, 2026, Brockman confirmed the overlap. When Musk’s attorney asked whether he had informed Musk of his Cerebras ownership while simultaneously pushing for a deal with the company, Brockman’s answers were unambiguous: no email, no chat, no text.
Yesterday it was Brockman’s personal journals putting OpenAI’s mission story under a microscope — today Musk’s team is drilling into something more concrete: undisclosed financial stakes. Greg Brockman confirmed under oath that he held a personal equity position in Cerebras at the exact same time he was advocating for OpenAI to acquire the company, and he never told Musk. That’s a textbook conflict-of-interest disclosure failure. And Altman had his own Cerebras investment on top of that. So two guys running a nonprofit are both personally invested in the company they’re pushing the nonprofit to buy — and nobody said a word? That’s not a lapse in judgment, that’s a choice. Brockman’s exact words were that personal gain from the deal “wasn’t something on my mind.” That answer is going to be very hard to sell to a jury — or a judge. Fiduciary duty doesn’t come with a “I forgot I owned stock” exception. This is exactly what I worry about with these for-profit-adjacent AI shops — the nonprofit wrapper is doing a lot of PR work while the insiders are quietly stacking equity. OfficeChai flagged this one first, credit where it’s due. From Sarthak Singh at Moneycontrol:
The case focuses on claims by Elon Musk that OpenAI abandoned its nonprofit intent after he stepped away from the board in 2018. Musk is seeking damages worth tens of billions of dollars, along with leadership changes and a reversal of OpenAI’s transition to a for-profit model. The trial, taking place in federal court in Oakland, is now in its second week and gaining momentum.
Moneycontrol’s Sarthak Singh has this one — Greg Brockman’s personal journal entries are now being treated as central evidence in the Musk-Altman trial, with Brockman himself set to testify on whether OpenAI honored its original nonprofit mission. And worth noting — yesterday Brockman’s private notes came into focus; today they’re being cast as the centerpiece of the mission-shift argument. That’s a fast escalation in how much weight the court is putting on one man’s diary. A journal entry titled “Were we honest?” — I mean, that’s not great optics for a company that’s been telling everyone it’s saving humanity. Optics aren’t law, Devin. The legal question is whether OpenAI’s structural shift to a for-profit model constitutes a breach of the original founding commitments Musk signed onto — that’s a much harder bar to clear than “this looks bad.” We’ve put links to every story from today’s briefing in the show notes, so if something caught your ear, you can jump straight to the source and read more.
That’s Musk v Altman Daily for this Wednesday. This is a Lantern Podcast.