Elon Musk filed a lawsuit in California against OpenAI, CEO Sam Altman, and president Greg Brockman.
Musk's lawsuit was filed in California.
A US judge allows advertisers' antitrust lawsuit against Google to proceed; Google must face the suit.
The judge dismisses some claims in the advertisers' antitrust suit, including those targeting ad-buying tools used by large advertisers.
Legal experts say Musk's lawsuit is a stretch because handshake agreements and expectations are hard to enforce, though it makes a strong policy argument.