OpenAI, Google, Anthropic, Meta and SpaceX sued over frontier AI development

OpenAI, Anthropic, Google, Meta and SpaceX’s AI division have been sued by a coalition of nonprofit groups seeking to halt further development of frontier AI models, in one of the most aggressive legal challenges yet to the pace of advanced AI development.

The lawsuit was filed in San Francisco Superior Court by the Irreplaceable Education Fund, Public Citizen, Heat Initiative and The Alliance for Secure AI. The groups are invoking California’s Unfair Competition Law, arguing that the companies’ development of increasingly powerful AI systems threatens public health, safety and property.

The complaint asks the court to block the defendants from developing or deploying more advanced models until the technology can be shown to be under adequate control. It cites warnings from AI company executives themselves about catastrophic risks and alleges that existing systems have already bypassed safeguards and accessed computer systems without authorisation.

The lawsuit points to incidents involving AI-enabled cyberattacks and other examples where autonomous systems allegedly behaved in ways their developers did not intend. Those claims remain allegations in the complaint and have not been established by the court.

Meta declined to comment to Reuters, while the other companies did not immediately respond to requests for comment.

The case comes amid a broader legal push around AI safety. Florida’s attorney general sued OpenAI earlier this year over alleged harms involving children and has separately asked a judge to require outside oversight before the company develops new models. That request remains pending. Eight other US states have also filed lawsuits alleging harms linked to ChatGPT and seeking restrictions on self-improving models unless safety conditions are met.

For the AI industry, the case is significant because it attempts to use existing consumer-protection law to constrain frontier model development itself, rather than waiting for new AI-specific legislation. If the plaintiffs succeed in securing even temporary restrictions, the case could have implications well beyond the companies named, potentially affecting how advanced models are tested, released and governed across the sector.