View source for Buist v Anthropic PBC

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|+ style="font-size:125%;font-weight:bold;padding:0.5em;" | Case Information
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! scope="row" style="width:30%;text-align:left;vertical-align:top;" | Case name
| style="vertical-align:top;overflow-wrap:anywhere;" | Buist et al. v. Anthropic PBC et al.<ref name="buist-complaint" />
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! scope="row" style="width:30%;text-align:left;vertical-align:top;" | Court
| style="vertical-align:top;overflow-wrap:anywhere;" | U.S. District Court for the Northern District of California, San Francisco Division<ref name="buist-complaint" />
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! scope="row" style="width:30%;text-align:left;vertical-align:top;" | Docket
| style="vertical-align:top;overflow-wrap:anywhere;" | 3:26-cv-10693<ref name="buist-complaint" />
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! scope="row" style="width:30%;text-align:left;vertical-align:top;" | Filed
| style="vertical-align:top;overflow-wrap:anywhere;" | September 18, 2026<ref name="buist-complaint" />
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! scope="row" style="width:30%;text-align:left;vertical-align:top;" | Judge(s)
| style="vertical-align:top;overflow-wrap:anywhere;" | Not identified in the reviewed complaint.
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! scope="row" style="width:30%;text-align:left;vertical-align:top;" | Plaintiffs
| style="vertical-align:top;overflow-wrap:anywhere;" | Charles Buist; Cheyenne Hunt; Christine Bullock; Nick Spetsas<ref name="buist-complaint" />
|-
! scope="row" style="width:30%;text-align:left;vertical-align:top;" | Defendants
| style="vertical-align:top;overflow-wrap:anywhere;" | Anthropic PBC; OpenAI OpCo LLC; SpaceXAI LLC; Google LLC<ref name="buist-complaint" />
|-
! scope="row" style="width:30%;text-align:left;vertical-align:top;" | Case type
| style="vertical-align:top;overflow-wrap:anywhere;" | Proposed consumer antitrust class action<ref name="buist-complaint" />
|-
! scope="row" style="width:30%;text-align:left;vertical-align:top;" | Claims / issues
| style="vertical-align:top;overflow-wrap:anywhere;" | Sherman Act § 1; Clayton Act damages and injunctive relief<ref name="buist-complaint" />
|-
! scope="row" style="width:30%;text-align:left;vertical-align:top;" | Status
| style="vertical-align:top;overflow-wrap:anywhere;" | September 18, 2026: complaint filed<ref name="buist-complaint" />
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Four consumers filed a proposed class action against [[Anthropic]], [[OpenAI|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.<ref name="buist-complaint">[https://drive.google.com/file/d/1ufb8Bg9RA9LmRKOvXSm9UbP9YITI9sDq/view 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.]</ref>

== 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.<ref name="buist-complaint" />

Politico reported the filing and said the defendants had not immediately responded to its requests for comment.<ref name="buist-politico">[https://www.yahoo.com/news/politics/articles/anthropic-openai-spacexai-google-sued-010440086.html 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).]</ref>

== Related coverage ==
* [[United States policy on catastrophic AI risk#Pacing agreements, pauses, and bans|Pacing agreements and AI policy]]
* [[AI Law Wiki News for September 19, 2026#Consumers challenge alleged AI-development coordination under antitrust law|September 19, 2026 digest]]

== References ==
<references />

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[[Category:Cases]]
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[[Category:Cases Against Anthropic]]
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