Amodei wrote that coordinating on pace would need an antitrust waiver. Altman said OpenAI would not wait for one. Both lines are now in a lawsuit.

Four consumers filed a class action in the Northern District of California on 18 September, naming Anthropic, OpenAI, SpaceXAI and Google. Anthropic PBC alleges a horizontal agreement to slow the rate at which the four improve competing products, contrary to section 1 of the Sherman Act. Bloomberg Law reported the filing.