In January 2026, U.S. District Judge Yvonne Gonzalez Rogers looked across a federal courtroom in Oakland and delivered a sentence that sent shockwaves through Silicon Valley: "This case is going to trial."
Behind her were 22 months of motions, filings, counter-filings, and one judge's rejection of nearly every attempt by OpenAI and Microsoft to make the lawsuit disappear. Ahead of her: the most consequential AI legal proceeding in history.
Jury selection begins April 27. The case is Musk v. Altman.
The stakes are not abstract. OpenAI completed its conversion from a nonprofit to a for-profit company in October 2025, cementing a structure that gives a newly created nonprofit foundation about 26 percent of the new for-profit entity. Following a $110 billion funding round closed in February 2026, the company's pre-money valuation reached $730 billion at its February 2026 funding round, rising to approximately $840 billion post-money. Elon Musk says that conversion was built on a lie told to him in 2015. If a jury agrees, the reckoning could reshape how Silicon Valley structures itself for a generation.
What Musk Is Claiming
Musk co-founded OpenAI in 2015 alongside Sam Altman, Greg Brockman, Ilya Sutskever, and others. He contributed approximately $38 million to the organization across its first several years, and by his own account provided far more than money: access, credibility, recruits, and the gravitational pull of his name.
His central claim is straightforward. He donated that money, he says, because Altman and Brockman assured him OpenAI would remain a nonprofit forever. It would not be owned by investors. It would not exist to generate returns. It would exist to benefit humanity. He took that assurance at face value. He says it was false.
The surviving claims heading to trial are fraud, breach of charitable trust, and unjust enrichment. In March 2025, Judge Gonzalez Rogers dismissed Musk's breach of contract claim, ruling that the 2015 founding agreement did not explicitly bar a for-profit restructuring. But she allowed the remaining claims to proceed, noting that OpenAI's nonprofit promises could constitute misleading conduct if proven.
Musk's damages expert, financial economist C. Paul Wazzan of Berkeley Research Group, calculated that Musk is owed between $79 billion and $134 billion. The theory: his early contributions represent 50 to 75 percent of the nonprofit's stake, and that stake — now embedded in a company valued at roughly $730 billion pre-money at the time of Wazzan's report — entitles him to a proportional share.
Judge Gonzalez Rogers told attorneys at a March 13 hearing that a jury would see through the methodology: "A jury is going to understand that he is pulling these numbers out of the air." She added: "Do I find it convincing? Not really. Based on what I've seen, do I find it particularly persuasive? Not really." She did not throw out the expert testimony. Doing so, she said, would effectively end the trial before it began.
Musk has pledged to donate any winnings to charity.
The Diary Entry That Changed Everything
The lawsuit might have died quietly. OpenAI filed a motion to dismiss. Microsoft filed a motion to dismiss. In March 2025, the contract claim was gone.
Then came the diaries.
During discovery in 2025, Musk's attorneys subpoenaed Greg Brockman's personal records. What they found was a 2017 handwritten journal entry that Judge Gonzalez Rogers later described as critical to her decision to send the case to trial.
Brockman had written: "I cannot believe that we committed to non-profit if three months later we're doing b-corp then it was a lie."
Another entry referenced escaping Musk's influence: "This is the only chance we have to get out from Elon."
The judge cited the diary directly in her January 15, 2026 ruling, stating there was "ample evidence in the record" and that "triable issues of fact exist for a jury to decide." The phrase "it was a lie" — written by a co-founder in 2017, two years before the for-profit transition — became the headline driving the case to Oakland.
OpenAI disputed the interpretation immediately. The company argued the diary entries were taken out of context, that the surrounding passages tell a different story, and that Brockman was processing internal anxieties rather than making confessions.
The jury will decide which reading is right.
How It Got Here
Pretrial Week: What the Judge Decided
The most recent pretrial hearing, held March 13, ran several hours and settled several disputes over what the jury will hear.
The most notable ruling: Judge Gonzalez Rogers barred OpenAI and Microsoft from questioning Musk about his alleged ketamine use. The judge found that defendants had failed to establish a connection between the substance and any specific decisions Musk made about OpenAI. The ketamine angle had been a central element of OpenAI's strategy to undermine Musk's credibility.
She did allow limited questioning about Musk's attendance at Burning Man, where OpenAI's attorneys say significant early communications between the parties took place. The judge, based in the Bay Area, was unbothered: "In the Bay Area, Burning Man is no big deal."
On expert witnesses, the judge said she would likely permit UC Berkeley professor Stuart Russell to testify on AI expertise. She reserved judgment on whether Russell could tell the jury that artificial general intelligence poses a 1 to 3 percent annual existential risk to humanity, saying the scientific basis for that specific figure needed more support.
On punitive damages, the judge signaled she would likely reject Musk's claim, though the case could still reach $134 billion in compensatory and unjust enrichment theories.
Her message to both sides was direct: the trial begins as scheduled, and she will run it efficiently.
The Other Side
OpenAI's defense rests on several pillars, each aimed at dismantling Musk's framing of himself as a betrayed idealist.
The company's position, published publicly and argued in court, is that Musk himself agreed in 2017 that a for-profit structure would be necessary. Altman and Brockman did not deceive him, OpenAI argues. Negotiations broke down when the company refused to give Musk majority equity and full operational control. His departure was not a betrayal — it was a failed acquisition attempt.
In a statement, OpenAI described the lawsuit as "Elon's latest variant of this lawsuit" and "his fourth attempt at these particular claims, and part of a broader strategy of harassment aimed at slowing us down."
The company points to Musk's own communications. In February 2023, Altman texted Musk: "you're my hero and that's what it feels like when you attack openai[.]" That message, now in evidence, implies the attacks were not principled grievances but competitive ones.
OpenAI also argues that Brockman's diary entry was decontextualized. The surrounding passages, the company says, show Brockman processing internal tensions rather than documenting fraud.
On the antitrust claims, Microsoft and OpenAI are fighting to introduce evidence of xAI's own business dealings, including Grok 4's integration into Microsoft's Azure AI Foundry, as evidence that Musk's competitive motives contaminate the entire case.
Legal experts outside the case offer a more measured view. Prediction markets as of late March put Musk's odds of winning at 28 to 36 percent. Darrow, a legal analytics firm, estimated that conventional fraud principles would limit Musk's actual recovery to restitution of his $38 million donation plus interest — a range of roughly $20 to $38 million — not a share of OpenAI's enterprise value. The $134 billion figure, Darrow noted, has no precedent in comparable cases. The ConnectU v. Facebook case, involving founding-era fraud claims, settled for $65 million.
The California Attorney General's October 2025 agreement with OpenAI adds another complication. Rob Bonta signed off on the conversion after extracting charitable-asset protections and safety commitments. Whether that sign-off forecloses some of Musk's theories about wrongful conversion of charitable assets is a question the jury may never need to resolve — but it hangs over the case.
The Bottom Line
In 34 days, a jury in Oakland will decide whether Sam Altman and Greg Brockman made a promise they never intended to keep.
The gap between the legal question and the financial number could not be wider. What Musk actually donated was $38 million. What he says he is owed is $134 billion. The judge thinks the damages methodology is unconvincing. The prediction markets think Musk is more likely to lose. Legal analysts think, if he wins at all, the realistic payout — based on Darrow's analysis — looks closer to $20 to $38 million than $60 billion.
But the trial is not really about money — at least not in the way the numbers suggest. A Musk victory, even a partial one, would validate the argument that AI nonprofits cannot simply shed their founding commitments when capital demands require it. It would create legal risk for every mission-driven tech organization that has ever pivoted toward profit. It would also hand Musk a reputational weapon against OpenAI at the precise moment when his own xAI is competing with ChatGPT for the same users, the same developers, and the same enterprise contracts.
OpenAI, for its part, has completed its conversion, closed a new financing round, and secured regulatory sign-off from two state attorneys general. It has spent two years arguing that the lawsuit is harassment dressed as principle. Its CEO is about to take the stand and make that case to twelve strangers.
Brockman wrote "it was a lie" in 2017. He will now have to explain what he meant.
Sources
- Elon Musk's lawsuit against OpenAI will face a jury in March — TechCrunch (Jan 8, 2026)
- Musk wants up to $134B in OpenAI lawsuit, despite $700B fortune — TechCrunch (Jan 17, 2026)
- Musk, OpenAI lawyers trade barbs as lawsuit heads to trial — CNBC (Jan 8, 2026)
- Elon Musk seeks up to $134 billion from OpenAI and Microsoft — CNBC (Jan 17, 2026)
- Oakland judge clears way for trial on whether OpenAI betrayed charitable roots — Local News Matters (Mar 16, 2026)
- Elon Musk Wins Ruling in $134 Billion Fraud Trial Against OpenAI — Benzinga (Mar 2026)
- OpenAI Lawsuit Exposed: The Private Diaries, Secret Texts and $500 Billion Fraud Case — TechBuzz AI (2026)
- Musk's OpenAI lawsuit clears path to trial, putting Microsoft in the spotlight — Computerworld (Jan 2026)
- Can OpenAI Survive Elon Musk? — TIME (2026)
- Looking Past Valuation Headlines: A Damages Analysis of Musk v. OpenAI — Darrow AI (2026)
- OpenAI completes its for-profit recapitalization — TechCrunch (Oct 28, 2025)
- Elon Musk vs. OpenAI: Musk Says He Will Donate Any OpenAI Lawsuit Winnings to Charity — FinTech Weekly (2026)
- The truth Elon left out — OpenAI (2026)
- Elon Musk sues OpenAI and CEO Sam Altman over contract breach — CNBC (Mar 1, 2024)
- Pre-trial fight in OpenAI case focuses on Elon Musk's dual role as Microsoft partner and plaintiff — GeekWire (2026)
- Musk v. Altman, 4:24-cv-04722 — CourtListener (Court docket)