After joining with Mr. Musk to create OpenAI in 2015 and pledging to carefully develop artificial intelligence for the benefit of humanity, the suit claimed, Mr. Altman and Mr. Brockman abandoned this mission by entering its multibillion-dollar partnership with Microsoft.

The billionaire accused the ChatGPT maker of anticompetitive behavior in new court filings.

Elon Musk has amended his lawsuit against OpenAI, adding more anti-trust claims against the company and including Microsoft as a defendant. He also added his company, xAI, as well as Shivon Zilis, a former OpenAI board member and mother to three of his children,

Elon Musk has filed an amended complaint against OpenAI, accusing the company — and its close partner, Microsoft — of anticompetitive dealings.