Elon Musk, the world's richest person, took the stand and testified over the course of three days in his trial against OpenAI CEO Sam Altman.

Elon Musk sued OpenAI, Sam Altman and Greg Brockman in 2024, claiming they reneged on their promise to keep the artificial intelligence lab a nonprofit.

Altman faces off against Musk, his OpenAI co-founder, in second day of high-stakes lawsuit

OpenAI’s lawyers argue Musk’s lawsuit aims to undermine the company for his competing venture, xAI.

Elon Musk was cross-examined on the third day of the trial over his lawsuit against Sam Altman and OpenAI.

Elon Musk sued OpenAI, Sam Altman and Greg Brockman in 2024, claiming they reneged on their promise to keep the artificial intelligence lab a nonprofit.

Trial continues after heated back and forth during OpenAI’s cross-examination of the Tesla CEO on Wednesday

A benefactor to OpenAI's co-founders – to whom he gave $38 million from 2015 to 2017 – Elon Musk accuses CEO Sam Altman and his partner Greg Brockman of betraying the startup's…

The Musk v. Altman trial tests whether OpenAI’s for‑profit shift was legal — a ruling that could reshape how AI labs raise capital, structure governance and attract investors.

Musk kept his cool, and OpenAI’s lawyer bulldozed him with piercing questions about his motivations for suing the company.

Elon Musk called himself a "fool" in court, warned of a "Terminator" future, and admitted that xAI taps OpenAI's models for its own AI training. Week one of Musk's trial against…

Elon Musk, the world's richest person, took the stand and testified over the course of three days in his trial against OpenAI CEO Sam Altman.

Here’s what we learned from Elon Musk’s testimony, and what to expect this week.