Buist v Anthropic PBC

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Case Information
Case name	Buist et al. v. Anthropic PBC et al.^[1]
Court	U.S. District Court for the Northern District of California, San Francisco Division^[1]
Docket	3:26-cv-10693^[1]
Filed	September 18, 2026^[1]
Judge(s)	Not identified in the reviewed complaint.
Plaintiffs	Charles Buist; Cheyenne Hunt; Christine Bullock; Nick Spetsas^[1]
Defendants	Anthropic PBC; OpenAI OpCo LLC; SpaceXAI LLC; Google LLC^[1]
Case type	Proposed consumer antitrust class action^[1]
Claims / issues	Sherman Act § 1; Clayton Act damages and injunctive relief^[1]
Status	September 18, 2026: complaint filed^[1]

Four consumers filed a proposed class action against Anthropic, OpenAI OpCo LLC, SpaceXAI LLC and Google LLC on September 18, 2026. They allege that coordination to slow improvement of competing AI subscription products violates Section 1 of the Sherman Act.^[1]

Claims and requested relief

The complaint seeks class certification, treble damages and injunctive relief. It frames the alleged injury as reduced product quality and slower improvements for subscription prices paid. The pleaded challenge concerns an alleged agreement among competitors; the requested relief preserves independent safety decisions and lawful standard-setting.^[1]

Politico reported the filing and said the defendants had not immediately responded to its requests for comment.^[2]

Related coverage

References

[buist-complaint-1] 1.00 ^1.01 ^1.02 ^1.03 ^1.04 ^1.05 ^1.06 ^1.07 ^1.08 ^1.09 ^1.10 Buist et al. v. Anthropic PBC et al., No. 3:26-cv-10693 (N.D. Cal.), ECF 1, filed September 18, 2026, pp. 1–7, 25–29.

[buist-politico-2] Tyler Katzenberger and Christine Mui, Politico via Yahoo News, “Anthropic, OpenAI, SpaceXAI, Google sued over call to ‘pace’ AI development,” September 18, 2026 (September 19 UTC).

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