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Update with Day 2 trial developments: Musk testimony, YGR admonishments
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'''Musk v. Altman et al.''' (Case No. 4:24-cv-04722-YGR) is a landmark lawsuit in which '''Elon Musk''' alleges that '''OpenAI''' cofounders '''Sam Altman''' and '''Greg Brockman''' breached a charitable trust and were unjustly enriched by Musk's donations, after promising that OpenAI would remain a nonprofit. Originally filed as a 26-claim complaint including fraud and constructive fraud, the case was narrowed to two claims on April 24–25, 2026, when Musk voluntarily dismissed his fraud claims ahead of trial. Jury selection begins April 27, 2026, before Judge '''Yvonne Gonzalez Rogers''' in the United States District Court for the Northern District of California (Oakland).<ref name="justia">[https://dockets.justia.com/docket/california/candce/4:2024cv04722/433688 Justia: Musk v. Altman et al Docket]</ref><ref name="businessinsider">[https://www.businessinsider.com/elon-musk-vs-openai-sam-altman-legal-battle-stakes-microsoft-2026-4 Business Insider, "Elon Musk vs. Sam Altman: The stakes for OpenAI and Microsoft," April 2026]</ref><ref name="musk-drops-fraud">[https://fortune.com/2026/04/25/elon-musk-fraud-claims-openai-sam-altman-trial/ Fortune, "Elon Musk drops fraud claims against OpenAI ahead of trial," April 25, 2026]</ref><ref name="cybernews-drops">[https://cybernews.com/ai-news/musk-drops-fraud-claims-in-openai-lawsuit-two-claims-head-to-trial/ Cybernews, "Musk drops fraud claims in OpenAI lawsuit, two claims head to trial," April 25, 2026]</ref><ref name="justia">[https://dockets.justia.com/docket/california/candce/4:2024cv04722/433688 Justia: Musk v. Altman et al Docket]</ref><ref name="businessinsider">[https://www.businessinsider.com/elon-musk-vs-openai-sam-altman-legal-battle-stakes-microsoft-2026-4 Business Insider, "Elon Musk vs. Sam Altman: The stakes for OpenAI and Microsoft," April 2026]</ref>
'''Musk v. Altman et al.''' (Case No. 4:24-cv-04722-YGR) is a landmark lawsuit in which '''Elon Musk''' alleges that '''OpenAI''' cofounders '''Sam Altman''' and '''Greg Brockman''' breached a charitable trust and were unjustly enriched by Musk's donations, after promising that OpenAI would remain a nonprofit. Originally filed as a 26-claim complaint including fraud and constructive fraud, the case was narrowed to two claims on April 24–25, 2026, when Musk voluntarily dismissed his fraud claims ahead of trial. A '''bench trial with advisory jury''' began April 27, 2026 before Judge '''Yvonne Gonzalez Rogers''' in the U.S. District Court for the Northern District of California (Oakland). On '''April 28, 2026''', Musk took the stand, testifying that Altman and Brockman illegally "looted" OpenAI's charitable assets after he invested $38 million under the condition it remain a nonprofit. Judge Gonzalez Rogers admonished both sides to refrain from using social media to inflame the dispute and warned OpenAI not to take inconsistent positions in her courtroom.<ref name="law360-trial">[https://www.law360.com/technology/articles/musk-testifies-looting-openai Law360, "Musk Testifies Altman 'Looting' OpenAI Charity For Own Gain," April 28, 2026]</ref><ref name="bloomberg-ygr">[https://www.bloomberg.com/ Bloomberg, "Musk v. Altman: judge asks executives to control social media," April 28, 2026]</ref><ref name="verge-day2">[https://www.theverge.com/ai-artificial-intelligence The Verge, "Elon Musk appeared more petty than prepared," April 28, 2026]</ref><ref name="justia">[https://dockets.justia.com/docket/california/candce/4:2024cv04722/433688 Justia: Musk v. Altman et al Docket]</ref><ref name="businessinsider">[https://www.businessinsider.com/elon-musk-vs-openai-sam-altman-legal-battle-stakes-microsoft-2026-4 Business Insider, "Elon Musk vs. Sam Altman: The stakes for OpenAI and Microsoft," April 2026]</ref><ref name="musk-drops-fraud">[https://fortune.com/2026/04/25/elon-musk-fraud-claims-openai-sam-altman-trial/ Fortune, "Elon Musk drops fraud claims against OpenAI ahead of trial," April 25, 2026]</ref><ref name="cybernews-drops">[https://cybernews.com/ai-news/musk-drops-fraud-claims-in-openai-lawsuit-two-claims-head-to-trial/ Cybernews, "Musk drops fraud claims in OpenAI lawsuit, two claims head to trial," April 25, 2026]</ref><ref name="justia">[https://dockets.justia.com/docket/california/candce/4:2024cv04722/433688 Justia: Musk v. Altman et al Docket]</ref><ref name="businessinsider">[https://www.businessinsider.com/elon-musk-vs-openai-sam-altman-legal-battle-stakes-microsoft-2026-4 Business Insider, "Elon Musk vs. Sam Altman: The stakes for OpenAI and Microsoft," April 2026]</ref>


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== See Also ==
== See Also ==
 
* [[News Musk v Altman Trial Begins April 27 2026|Musk v. Altman Trial Begins (April 27, 2026)]]
* [[News Musk-v-OpenAI-Trial-April-2026|April 26, 2026 — Musk v. OpenAI Trial Begins With Jury Selection April 27]]
* [[News-Musk-v-Altman-Trial-Day-2-2026|Musk v. Altman Trial Day 2: Musk Testifies (April 28, 2026)]]
* [[Nippon Life v OpenAI Foundation]] — OpenAI sued for unlicensed practice of law
* [[News Musk v OpenAI Trial April 2026|Musk v. OpenAI Trial Overview (April 2026)]]
* [[Doe v X.AI Corp]] — xAI (Musk's company) sued for CSAM deepfakes
* [[Musk v Altman et al]] (this page)
* [[Cases]] — Active AI litigation tracker
]
 
== References ==
 
<references />
 
[[Category:Cases Against OpenAI]]
[[Category:Corporate Governance]]