Greg Brockman takes the stand, and suddenly Elon Musk's case against OpenAI has an actual paper trail. Welcome to Musk v Altman Daily. We’re in the testimony now, and Devin, I have to say, Brockman’s journal might be the most consequential diary since somebody learned the word "founder". We’ve got betrayal claims, undisclosed personal investments, and the words "Were we honest?" written in Brockman’s own hand — all of it now sitting in front of a federal judge. A for-profit AI giant potentially built on broken promises? Yeah. Stay with us, because this gets ugly fast. Here's 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 on the stand pushing back on Musk’s origin story for OpenAI. Today the jury heard something much more personal: Brockman says that in a 2017 meeting, when he rejected Musk’s bid for more control, he genuinely thought Musk was about to hit him. A billionaire throws a tantrum because he can’t take over an AI company, so he cuts the funding. Classic. But that physical-intimidation detail? That hit differently. Legally, Brockman’s testimony is going straight at the control question. Musk’s lawsuit says OpenAI betrayed its nonprofit mission; the other side says he wanted to run the place himself from day one. BBC’s Lily Jamali and Kali Hays have the courtroom coverage. So Musk’s line is, "you broke the mission" — but the testimony keeps nudging the other way: maybe the real complaint was, "you wouldn’t hand me the keys." Those are not the same thing. 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.
We’re in federal court in Oakland now, and OpenAI dropped a filing Sunday night that tries to reframe the whole trial. Not as a charity governance dispute — as a question of why Musk filed in the first place. Yesterday the disputed settlement text got partly sidelined; today OpenAI is using that filing to say Musk’s motive was competitive, not philanthropic. And that pre-trial phone call is the headline for me. Musk calls Greg Brockman two days before trial, supposedly to feel out a settlement, and then ends with, "by the end of this week, you and Sam will be the most hated men in America." That’s not an overture. That’s a threat. Legally, though, it’s messier than that. Musk’s core claim is still breach of charitable trust: OpenAI took his donations, promised a nonprofit AI-safety mission, and then shifted into a for-profit structure. A menacing phone call doesn’t just erase that argument. Sure, but if the judge is looking at the story and sees a guy who built a competing AI company and then sued to knock his rivals off the board — that motive argument lands a lot differently. Wait, this is a bench trial, right? It is. Judge only. And you’re right that motive matters — but motive is OpenAI’s play to undercut Musk’s standing, not a substitute for disproving his breach-of-trust claims. Those are separate tracks. Here's 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 the microscope. Today Musk’s team is back in that same 2017 window, asking why Brockman never told Musk he personally owned a stake in Cerebras while he was pushing OpenAI to acquire it. That came out under oath on May 4th, courtesy of OfficeChai. So he had equity in the target company, he was pushing the deal internally, and his explanation is basically, "it wasn’t on my mind"? At a nonprofit? Come on. That’s not a defense — that’s a confession in a shrug. Legally, the question is whether fiduciary duty to the organization required disclosure. And at a nonprofit, that standard is real. "It wasn’t something on my mind" lands very differently in a courtroom than it does in a startup founders’ Slack. Moneycontrol, with Sarthak Singh:
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 the story. Yesterday we flagged Brockman’s private notes surfacing in filings; today the court is treating that journal as central evidence on whether OpenAI deliberately walked away from its nonprofit mission. The guy wrote "Were we honest?" in his own journal. That is not a great look when you’re trying to argue you never abandoned the mission. It’s a compelling headline, but a journal entry showing internal doubt is not the same thing as legal proof of fraud or breach of fiduciary duty. Different standards, and Musk still has to meet them. Sure — but if the for-profit pivot was always the plan and they sold Musk on a nonprofit dream to get his money, that’s not just legally interesting. That’s a con. If you follow Musk v Altman, you’ll want The Data Center Daily — a daily briefing on AI compute, hyperscaler capex, the power grid, semiconductor supply, and energy markets reshaped by intelligence at scale. Find it wherever you listen to podcasts.
You’ll find links to every story we covered today in the show notes, so if one of them caught your ear, you can jump straight into the source material there.
That’s Musk v Altman Daily for today. This is a Lantern Podcast.