- Sources: Independent report, HN discussion, second thread
- Summary: The complaint was filed 2026-09-18 in the US District Court for the Northern District of California by four named plaintiffs who subscribe to ChatGPT, Claude, Grok or Gemini, on behalf of a proposed nationwide class of paid subscribers, and it argues that a mutual pledge among dominant rivals to move slower than competition would produce has an anticompetitive effect. It centres on an essay Dario Amodei published 2026-09-12 calling for a collective slowdown in favour of safety work, publicly endorsed the same day by Demis Hassabis, Sam Altman and Elon Musk. Amodei's essay acknowledged the antitrust problem and asked for the US government to mediate or enable cross-lab discussion through a narrow waiver for safety conversations, and Altman replied that OpenAI supports a federal framework and does not believe it needs to wait for an antitrust exemption. The allegations are untested and the four companies did not respond to requests for comment.
- Why it matters: The complaint targets release pacing itself, so the outcome bears on how fast the four labs ship capability to paying developers.
- Follow-up: Track the first substantive ruling or any motion to dismiss.
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