Elon Musk testifies in OpenAI trial against Sam Altman

By The BriefBrief

Elon Musk testified for a second day in a trial against Sam Altman over OpenAI's nonprofit promises.

WHO: Elon Musk

WHAT: Elon Musk took the stand for the second day in the OpenAI trial against Sam Altman

WHEN: Apr 29, 2026 at 8:46 PM ET

WHERE: Location not specified

WHY: Musk accused Sam Altman of betraying promises to keep OpenAI as a nonprofit dedicated to humanity's benefit.

How this story developed (showing 24 of 24 earlier reports)

Elon Musk lawsuit puts OpenAI safety record under scrutiny · May 7, 2026 at 4:03 PM ET
Musk sought Altman role at Tesla before OpenAI fallout · May 6, 2026 at 7:03 PM ET
Prediction markets weigh Musk’s OpenAI lawsuit · May 6, 2026 at 5:00 PM ET
Greg Brockman says Elon Musk left OpenAI · May 6, 2026 at 3:02 PM ET
Musk sought $80 billion stake; OpenAI president testifies · May 5, 2026 at 10:04 PM ET
OpenAI president forced to read personal diary entries to jury · May 5, 2026 at 10:00 PM ET
Greg Brockman rebuts Musk on OpenAI history · May 5, 2026 at 6:00 PM ET
Musk vs. Altman courtroom battle in Oakland · May 4, 2026 at 10:01 AM ET
Elon Musk stumbles on stand at OpenAI trial · May 1, 2026 at 5:05 PM ET
Musk v. Altman is just getting started in court · May 1, 2026 at 2:02 PM ET
Elon Musk stumbles during OpenAI trial testimony · May 1, 2026 at 12:00 PM ET
Elon Musk combative on stand in OpenAI trial · Apr 30, 2026 at 3:02 AM ET
Elon Musk tells court he was a 'fool' for funding OpenAI · Apr 29, 2026 at 7:00 PM ET
Elon Musk testifies in OpenAI legal battle with Sam Altman · Apr 29, 2026 at 7:03 AM ET
Musk and Altman feud heads to month-long federal trial · Apr 28, 2026 at 8:04 AM ET
Musk and Altman set for OpenAI trial · Apr 27, 2026 at 8:00 PM ET
Elon Musk sues OpenAI · Apr 27, 2026 at 6:02 PM ET
Musk and Altman head to court over OpenAI · Apr 27, 2026 at 11:03 AM ET
Musk, Altman head to trial over OpenAI · Apr 27, 2026 at 4:05 AM ET
Musk and Altman trial begins Monday · Apr 25, 2026 at 2:00 AM ET
Judge dismisses Musk fraud claims in OpenAI case · Apr 24, 2026 at 10:07 PM ET
DOJ backs Musk xAI in Colorado AI law suit · Apr 24, 2026 at 3:00 PM ET
Musk lawsuit against OpenAI heads to trial · Apr 24, 2026 at 11:00 AM ET
Musk-Altman dispute heads to jury trial · Apr 23, 2026 at 6:05 PM ET

Reporting from 10 identified publishers across this event arc.

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Publishers represented across this event arc

Ars Technica —
2 articles
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CBS News — View reporting
CNBC Top News —
3 articles
Financial Times — View reporting
France 24 — View reporting
Japan Times — View reporting
TechCrunch —
2 articles
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- View article 2
The Verge — View reporting
The Verge Tech — View reporting
Wired — View reporting

These publishers contributed reporting to the broader event history. Not every source addresses the specific development described above.

How this brief is built: The BriefBrief correlates multiple sources into one evolving event brief, updated as new facts emerge.

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