Musk v Altman et al

Case Name	Musk v. Altman et al
Docket	4:24-cv-04722-YGR
Court	U.S. District Court for the Northern District of California
Judge	Hon. Yvonne Gonzalez Rogers
Filed	August 5, 2024
Plaintiff	Elon Musk
Defendants	Sam Altman, Greg Brockman, OpenAI, Inc., and related entities
Claims	Breach of charitable trust; unjust enrichment
Status	Active — bench trial with advisory jury underway (began April 27, 2026). Day 3: Musk admits xAI "partly" distilled OpenAI models. Day 4: Judge pauses to probe Musk\'s $97.4B OpenAI bid (April 30, 2026)

Musk v. Altman et al is a lawsuit filed by Elon Musk against OpenAI co-founders Sam Altman and Greg Brockman and related OpenAI entities, alleging that they breached the nonprofit charitable mission under which Musk made $38 million in donations to OpenAI. The case is the most prominent corporate governance dispute in the AI industry and went to trial in April 2026 before Judge Yvonne Gonzalez Rogers in the Northern District of California.

Background

Elon Musk was a co-founder of OpenAI and contributed approximately $38 million to the organization between 2016 and 2020, on the understanding that it would remain a nonprofit dedicated to the safe development of AI for humanity's benefit. Musk departed OpenAI's board in 2018, reportedly after a failed bid to take control of the company. OpenAI subsequently created a "capped-profit" structure in 2019 and has since pursued a full conversion to a for-profit public benefit corporation.

Musk filed an initial lawsuit in February 2023 in California state court, which he voluntarily dismissed. He refiled in August 2024 in federal court, adding claims under RICO and other federal statutes. Over the course of the litigation, claims were narrowed substantially through motion practice.

Claims

The operative complaint at trial alleges two claims:

• Breach of charitable trust — Musk alleges that Altman, Brockman, and OpenAI violated the terms of the charitable trust under which OpenAI was founded and to which Musk donated, by converting the organization from a nonprofit to a for-profit entity.
• Unjust enrichment — Musk alleges that Altman and Brockman were unjustly enriched through equity and compensation they received as OpenAI transitioned away from its nonprofit structure.

Musk voluntarily dropped fraud claims on April 25, 2026, days before trial. Musk seeks approximately $134 billion in damages and injunctive relief blocking OpenAI's for-profit conversion.

Procedural History

• February 2023 — Initial complaint filed in California state court
• March 2023 — Lawsuit voluntarily dismissed
• August 5, 2024 — Refiled in U.S. District Court for the N.D. Cal.
• 2024–2025 — Motion practice; multiple claims dismissed or narrowed
• April 25, 2026 — Musk drops fraud claims ahead of trial
• April 27, 2026 — Bench trial with advisory jury begins; nine-person advisory jury seated
• April 28, 2026 — Musk testifies; accuses Altman and Brockman of "looting" OpenAI's charitable assets; judge admonishes both parties over social media conduct
• April 29, 2026 — Day 3 cross-examination: OpenAI counsel highlights Musk's opposition to state AI regulation and raises xAI safety record; judge indicates Musk's testimony may have "opened the door" to further questioning about xAI
• April 30, 2026 — Musk appears to admit under cross-examination that xAI used OpenAI's models through distillation, calling it "standard practice"

Trial

The bench trial with an advisory jury began April 27, 2026 in Oakland before Judge Yvonne Gonzalez Rogers. The advisory jury's verdict will not be binding; Judge Gonzalez Rogers will make the final determination on both liability and remedies.

OpenAI's position at trial is that Musk quit the company when he "didn't get his way" and that he never fulfilled his promised $1 billion contribution. Musk's position is that Altman and Brockman induced his donations by promising OpenAI would remain a nonprofit and that they then betrayed that commitment for personal financial gain.

The trial began April 27, 2026 and is expected to last approximately four weeks. If Musk prevails on liability, a second phase will address remedies, which include Musk's request to block OpenAI's for-profit conversion.

Significance

Musk v. Altman is the highest-profile AI corporate governance dispute to reach trial. The outcome will:

• Set precedent on whether founding commitments made by AI nonprofit organizations are legally enforceable by donors
• Determine whether OpenAI's transition from a nonprofit to a for-profit public benefit corporation can proceed
• Potentially expose the internal decision-making behind OpenAI's organizational transformation to public scrutiny through trial testimony

The case is being closely watched by the broader nonprofit and AI industry, as it could affect the legal obligations of other AI organizations that were founded with nonprofit or public-benefit missions.

• April 30, 2026: Day 3 of trial. Elon Musk appeared to admit under cross-examination that xAI had used OpenAI's models through distillation, characterizing it as "standard practice." When OpenAI attorney William Savitt asked whether xAI had distilled OpenAI models, Musk replied "partly" and said "generally all the AI companies" do it.

See Also

• April 27, 2026 — Bench Trial Begins
• April 29, 2026 — Trial Days 2 & 3 Digest
• April 30, 2026 — Distillation Admission
• XAI Corp v Weiser
• XAI v Bonta

Trial Developments

Day 5 (May 1–2, 2026): Judge Rebukes Toberoff

No courtroom session was held on May 1, but the presiding judge sharply criticized Musk's lead attorney Marc Toberoff for eliciting "waste of time" trial testimony about Musk's $97.4 billion OpenAI acquisition bid. The judge admonished Toberoff that he "shouldn't throw young lawyers under the bus" when Toberoff initially failed to promptly acknowledge directing the contested line of questioning. Additional evidence exhibits — including 2015 OpenAI founding emails, Tesla Model 3 vehicle receipts, and correspondence with Gabe Newell and Hideo Kojima — were publicly released. The bench trial is expected to resume May 2.

See: Trial Day 5 — Judge Rebukes Toberoff

Day 1 & 2 (April 28–29, 2026)

Opening arguments and Elon Musk's direct testimony. Musk testified that Sam Altman "looted" OpenAI by converting it from a nonprofit to a for-profit entity, and that the organization's original mission had been abandoned. OpenAI attorneys countered that the conversion was necessary to secure the capital needed to develop advanced AI.

Day 3 (April 30, 2026) — Distillation Admission

Under cross-examination, Musk admitted that his AI company xAI had "partly" used OpenAI's models to train its own through distillation — a technique where one AI model is trained to mimic another. When asked by OpenAI attorney William Savitt whether xAI had distilled OpenAI models, Musk characterized it as "standard practice to use other AIs to validate your AI" and said "generally all the AI companies" do it.

Day 4 (April 30, 2026) — $97.4B Bid Probe

Judge Yvonne Gonzalez Rogers paused the trial to investigate the circumstances of Musk's $97.4 billion acquisition proposal for OpenAI. The probe was triggered when Musk's legal team failed to object to a document during cross-examination, inadvertently opening the door to evidence about the bid. The evidence could undermine Musk's claim that OpenAI has abandoned its nonprofit mission, as the bid itself could be seen as an attempt to acquire OpenAI for competitive advantage.