Billionaire alleges Microsoft and OpenAI illegally sought to monopolize AI market and sideline competitors

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

Musk’s amended lawsuit, filed on Thursday night in federal court in Oakland, California, said Microsoft and OpenAI illegally sought to monopolize the market for generative artificial intelligence and sideline competitors.