Public statements, read as an agreement
Four consumers filed a class action in the U.S. District Court for the Northern District of California on September 18, 2026 against Anthropic, OpenAI, SpaceXAI and Google under Section 1 of the Sherman Act. The complaint alleges an agreement among the four to slow the pace at which each improves the products it sells to consumers, proposed in Dario Amodei's essay of September 12 and accepted in public within hours: Elon Musk wrote that Amodei was right, Sam Altman said he agreed that the frontier needed pacing, and Demis Hassabis called the essay the right path forward. [1]
The plaintiffs also allege, citing press reports, that representatives of Anthropic, OpenAI and Google had been coordinating through a working group since July. They seek treble damages under the Clayton Act and an injunction for a nationwide class of people who bought paid consumer subscriptions to ChatGPT, Claude, Grok or Gemini from September 12. The complaint says it does not challenge any company's own decisions about safety or the pace of its development, only competitors agreeing among themselves to substitute collective restraint for individual accountability. [1]
Allegations, with no response yet
CNN reported that none of the four companies immediately responded, and noted that Amodei's essay had itself raised antitrust concerns, saying it would help for the U.S. government to mediate or at least enable discussions between labs. [2]
Atlas interpretation: These are allegations in a newly filed complaint; nothing has been decided. The suit tests a question the pacing proposal left open: whether rivals can coordinate on safety without government involvement. The complaint points to that route itself, saying each company remains free to ask Congress for regulation. [1][2]
Sources
- Class Action Complaint, Buist v. Anthropic, PBC
U.S. District Court for the Northern District of California · Sep 18, 2026
- Lawsuit says Anthropic, OpenAI, SpaceXAI and Google made illegal agreement on AI slowdown
CNN Business · Sep 19, 2026
- Lawsuit says Anthropic, OpenAI, SpaceXAI and Google made illegal deal on AI slowdown
CBS News · Sep 19, 2026