Antitrust suit names Anthropic, OpenAI, SpaceXAI and Google over calls to pace AI
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What happened
A civil lawsuit filed in federal court on Friday, September 18, 2026 accused Anthropic, OpenAI, SpaceXAI and Google of collusion, Politico reported. The case, Buist v. Anthropic, was filed in the US District Court for the Northern District of California. Politico said the allegations followed recent calls for a coordinated slowdown of AI development. The suit relates to Anthropic CEO Dario Amodei's call for industry-wide coordination to slow frontier AI.
The Hill reported on September 19 that the plaintiffs alleged OpenAI CEO Sam Altman, SpaceXAI founder Elon Musk and Google DeepMind co-founder Demis Hassabis made an illegal business agreement among competitors by agreeing to slow the development of their AI systems. According to The Hill, the plaintiffs said this violated federal antitrust law. The reports did not state the relief or damages sought, and they carried no response from the four companies. The allegations are claims made in a complaint, and the reports describe no ruling on them.
Key points
- A civil antitrust lawsuit was filed in federal court on Friday, September 18, 2026.1
- The defendants named are Anthropic, OpenAI, SpaceXAI and Google.12
- Plaintiffs alleged an illegal agreement among competitors to slow AI development, in violation of federal antitrust law.2
- The Hill said the plaintiffs named Sam Altman, Elon Musk and Demis Hassabis in the alleged agreement.2
Why it matters
The suit adds an antitrust claim against Anthropic, one of four named defendants. The reports give no figure for what the plaintiffs seek.
The claims are allegations in a complaint, with no ruling and no company response in the reports, so the filing itself sets no figure that bears on any company's valuation.
The complaint concerns joint calls by competitors to slow development rather than one company's conduct, so the exposure is spread across four defendants.
In context
| Round | Date | Post-money valuation | Raised | Led by |
|---|---|---|---|---|
| Funding round | Oct 2, 2024 | $157B | $6.6B | Thrive Capital |
| Funding round | Mar 31, 2025 | $300B | $40B | SoftBank |
| Funding round | Feb 27, 2026 | $852B | $122B | a16z, D. E. Shaw Ventures, MGX, SoftBank, T. Rowe Price Associates, Inc., and TPG |
Updated
Fact-check
- A civil lawsuit was filed in federal court on Friday, September 18, 2026.Stated by [1] Politico per the writer's read, and matches the event's research data (filed Sep 18). Politico and The Hill [2] both blocked automated access for this check.Partly verified
- The case is Buist v. Anthropic, filed in the Northern District of California, and it relates to Dario Amodei's call for industry-wide coordination to slow frontier AI.Rests on the event's research data; neither source page could be opened for this check.Partly verified
- The suit names Anthropic, OpenAI, SpaceXAI and Google.Stated in the headlines of [1] Politico and [2] The Hill as recorded in the source list; the article pages were blocked for this check.Partly verified
- Plaintiffs allege Sam Altman, Elon Musk and Demis Hassabis made an illegal agreement among competitors to slow AI development, violating federal antitrust law.Stated by [2] The Hill per the writer's read; the page returned 403 for this check.Partly verified
- The Hill reported the suit on September 19, 2026.Date from the event's source data for [2]; the page could not be opened.Partly verified
Sources
- [1]Politico (opens in a new tab)Anthropic, OpenAI, SpaceXAI, Google sued over call to 'pace' AI development
- [2]The Hill (opens in a new tab)Lawsuit accuses Anthropic, OpenAI, SpaceXAI, Google of AI pacing 'collusion'
