Musk, the world’s richest man, was a co-founder of OpenAI, the company that launched in 2015 and went on to create ChatGPT. After Musk invested $38 million in its first years, his lawsuit filed in 2024 accused OpenAI CEO Sam Altman and his top deputy of shifting into a moneymaking mode behind his back.

OpenAI's chief futurist told the federal jury in the Musk v. Altman trial that Elon Musk "snapped and called me a jackass" at a 2018 company meeting.

Lawyers for Elon Musk and OpenAI made their closing arguments in the blockbuster federal trial on Thursday. Nine jurors are set to begin deliberations next week.

World's richest man Elon Musk and OpenAI CEO Sam Altman have been putting up their legal dukes for weeks now (1), since April 27. At the core of the feud is Musk's belief that he's entitled (2) to a large portion of OpenAI's eye-watering valuation,

Elon Musk flew to China with Trump despite OpenAI trial judge’s recall warning - ‘A typical witness would not leave the country if they were subject to recall,’ a legal expert said

Microsoft CTO Kevin Scott publicly addressed for the first time a 2018 email that Musk's lawyers have cited as evidence Microsoft knew OpenAI was abandoning its nonprofit mission. A confidential board memo filed in the case reveals how Microsoft's fear of falling behind Google drove the investment.

Musk sued OpenAI, Altman and the company's president, Greg Brockman, in 2024, alleging they went back on their vow to keep the artificial intelligence company a nonprofit and follow its charitable mission. He argued that the roughly $38 million he donated to OpenAI was used for unauthorized commercial purposes.

WSJ's Angel Au-Yeung has been reporting from the courthouse where OpenAI CEO Sam Altman took the stand Tuesday in the megatrial between him and billionaire Elon Musk.