OAKLAND, May 4 -- Following high-profile testimony from billionaire Elon Musk last week, one of OpenAI's co-founders will testify Monday in the California lawsuit brought by the world's richest man against the creators of ChatGPT.

Musk is seeking to force his rivals in artificial intelligence (AI) development to revert to a non-profit foundation.

Greg Brockman, co-founder and president of OpenAI, will face questioning from Musk's lawyers on Monday in the Oakland courthouse.

OpenAI CEO and co-founder Sam Altman, who in 10 years has gone from being Musk's protege to a bitter rival, is not expected to take the stand until the week of May 11.

The outcome of the case could shape the future of OpenAI, the fast-rising generative AI giant now...