Billionaire entrepreneur Elon Musk expanded his lawsuit against ChatGPT maker OpenAI, adding federal antitrust and other claims and adding OpenAI's largest financial backer Microsoft as a defendant.

The lawsuit argues that OpenAI and Microsoft are “actively trying to eliminate competitors” by exchanging “competitively sensitive information,” and making their investors

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.