Jury selection begins Monday morning in Oakland federal court for the trial that could reshape the artificial intelligence industry. Elon Musk is suing Sam Altman, Greg Brockman, and OpenAI on two claims: unjust enrichment and breach of charitable trust. He wants up to $150 billion in damages directed to OpenAI's nonprofit arm, the removal of Altman and Brockman from leadership, and a court order unwinding the company's conversion from nonprofit to for-profit. The trial is expected to last two to three weeks.

The timing could not be worse for OpenAI. The company is preparing for an initial public offering that could value it at over $1 trillion. Musk's most aggressive remedy, reversing the for-profit conversion entirely, would make that IPO impossible.

The Diary Entry That Sent This to Trial

The most damaging piece of evidence is a 2017 diary entry from Greg Brockman, OpenAI's co-founder and president: "I cannot believe that we committed to non-profit if three months later we're doing b-corp then it was a lie." Judge Yvonne Gonzalez Rogers cited that entry directly in her January 15 ruling that sent the case to trial. She found "ample evidence" supporting Musk's claims and rejected "nearly every attempt by OpenAI and Microsoft to make the lawsuit disappear." The ruling was a 28-page signal that the court considers the case serious enough for a jury to hear.

Musk's legal team has also produced a 2017 email in which Altman claimed he remained "enthusiastic about the non-profit structure" after Musk threatened to cut off funding. His attorneys frame that statement as a misrepresentation designed to keep donations flowing while leadership privately planned a different path. Hundreds of pages of discovery materials include emails, texts, and Slack messages that Musk's team says show leadership "said one thing publicly and planned something completely different privately."

The Witness List Is a Silicon Valley Tell-All

The confirmed witness list reads like an industry yearbook: Musk, Altman, Microsoft CEO Satya Nadella, former OpenAI CTO Mira Murati, co-founder Ilya Sutskever, and Shivon Zilis. A nine-member advisory jury will hear testimony, but the trial structure is unusual. The jury's verdict on liability will be advisory only. Judge Gonzalez Rogers, not the jury, will make the final determination on both liability and remedies. A strong jury consensus would carry significant moral authority in her deliberations, but it does not bind her.

A February 2023 text from Altman to Musk, sent after Musk had publicly criticized OpenAI, surfaced in discovery: "You're my hero and that's what it feels like when you attack OpenAI." Opening arguments are expected Tuesday. The liability phase runs through mid-May. If OpenAI is found liable, the remedies phase begins May 18.

Why Musk Dropped the Fraud Claims

On Friday, Musk voluntarily dropped his fraud and constructive fraud claims, narrowing the case from 26 claims to two. This was strategic, not a concession. Fraud requires proving intentional deception, a higher evidentiary bar that would have diverted the trial into arguments about Altman's state of mind. Unjust enrichment and breach of charitable trust focus on outcomes rather than intent: did the conversion enrich insiders at the expense of the charitable mission, and did it violate the trust under which the nonprofit's assets were held?

These claims are easier to prove because the core facts are largely undisputed. OpenAI was founded as a nonprofit. It converted to a for-profit. Its leaders hold equity in the for-profit entity. The question is whether that sequence constitutes a legal violation, not whether anyone intended it to be one. In his April 2026 amendment, Musk asked that Altman and Brockman be required to hand over "all equity and other personal financial benefits they obtained as a result of OpenAI's for-profit operations" to the OpenAI charity.

OpenAI's Defense

OpenAI has called the lawsuit "baseless" and described it as a "harassment campaign that's driven by ego, jealousy and a desire to slow down a competitor." The competitor is xAI, the AI company Musk founded in 2023 and recently merged with SpaceX in an all-stock transaction valuing the combined entity at $1.25 trillion. OpenAI's defense team will argue that Musk's motivations are competitive rather than charitable. Judge Gonzalez Rogers herself noted that "this country likes competition," flagging the potential self-interest in Musk's claims.

The structural defense is that OpenAI's conversion was reviewed by attorneys general in both California and Delaware, that the nonprofit entity now operates as the OpenAI Foundation holding approximately 26% of the company's valuation (roughly $130 billion), and that the Foundation retains oversight of mission alignment. OpenAI argues this structure preserves the charitable mission while enabling the scale of investment required to pursue artificial general intelligence. Altman, Brockman, and Microsoft have all denied wrongdoing. Musk is represented by Marc Toberoff, a Hollywood lawyer known for dramatic courtroom tactics. OpenAI has tapped white-shoe firm Wachtell, Lipton, Rosen & Katz.

What Is Actually at Stake

On Kalshi, prediction market traders put Musk's odds of winning at 45% as of Sunday, up from around 30% before the judge's January ruling. The $150 billion figure, pledged to charity, would represent the largest damages award in U.S. legal history. Even a partial victory for Musk could impose conditions on OpenAI's IPO, require changes to its governance structure, or force the return of equity held by executives. A full victory could unwind the conversion entirely, which would effectively kill the IPO and restructure the most valuable private AI company in the world.

For the AI industry, the trial sets a precedent about whether nonprofit AI research organizations can convert to for-profit entities without legal liability. Multiple AI companies, including Anthropic (which itself spun out of OpenAI), have complex corporate structures that could face similar challenges. The outcome will be watched by every AI lab currently raising capital, every investor evaluating pre-IPO positions, and every regulator considering whether the current framework for AI governance is adequate.