This week, Brockman fired back with his side of the story, arguing that Musk had actually pushed for OpenAI to create a for-profit arm and fought a bitter battle to have “absolute control” over it. OpenAI has argued that Musk is suing because he didn’t get his way and is now trying to undermine a competitor to his own AI company, xAI.

Shivon Zilis, a former OpenAI board member and the mother of four of Musk’s children, also testified, revealing that Musk tried to recruit OpenAI CEO Sam Altman to lead a new AI lab at his electric-car company, Tesla.

Musk cofounded OpenAI in 2015 with Altman, Brockman, and others but left in 2018. Now, he’s asking the court to remove Altman and Brockman from their roles and to unwind the restructuring OpenAI undertook last year, which converted its for-profit subsidiary into a public benefit corporation. He is also seeking as much as $134 billion in damages from OpenAI and Microsoft, OpenAI’s investor.

The outcome of the trial could upend OpenAI’s race toward an IPO at a valuation approaching $1 trillion. Meanwhile, xAI, which Musk founded in 2023, is now a division of his rocket company, SpaceX; the combined companies are also expected to go public as early as June, at a target valuation of $1.75 trillion.