Anthropic, OpenAI, SpaceXAI and Google face a lawsuit filed on Sept. 19 in the U.S. District Court for the Northern District of California alleging that executives coordinated to slow AI development. Four representative plaintiffs, including Florida attorney Charles Vyst, argue that agreements involving Anthropic CEO Dario Amodei, OpenAI CEO Sam Altman, SpaceXAI CEO Elon Musk and Google Chief Scientist Demis Hassabis could violate Section 1 of the Sherman Antitrust Act. The complaint distinguishes between companies independently adopting safety limits, which the plaintiffs do not challenge, and competitors collectively restraining development and coordinating model-release timing. The plaintiffs say paid users of Claude, ChatGPT, Grok and Gemini could be harmed by slower product improvements while subscription fees remain unchanged. They seek a court declaration that the alleged conduct constitutes collusion and compensation for damages. Amodei called on Sept. 12 for AI companies to slow the development of cutting-edge models, a position supported by Musk, Altman and Hassabis. President Donald Trump has criticized the AI-risk narrative, while NVIDIA CEO Jensen Huang has said the United States can develop AI safely while maintaining its leadership.