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Four paying subscribers to Claude, ChatGPT, Grok and Gemini filed a federal class-action lawsuit on September 18, accusing Anthropic, OpenAI, Google and xAI — named formally as SpaceXAI — of illegally coordinating to slow down their AI products.
- The complaint centers on a September 12 essay by Anthropic CEO Dario Amodei that drew quick public support from Elon Musk, Sam Altman and Demis Hassabis.
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The case arrives just as Congress stripped a related antitrust shield from a defense bill, while the Justice Department has signaled that narrower cybersecurity cooperation, specifically, would not raise the same red flags.
A dispute over how fast artificial intelligence should advance has moved from op-eds and Senate hearings into a federal courtroom. Four paying customers of the industry's leading chatbots are now arguing that a public pledge to build AI more carefully amounted, in legal terms, to something else entirely: an agreement among competitors to sell a worse product on purpose.
The Essay That Set Off the Lawsuit
The chain of events began on a Saturday in mid-September, when Anthropic chief executive Dario Amodei published an essay titled "We Must Pace the Frontier," calling on rival labs to coordinate on slowing the release of increasingly powerful systems in the name of safety. The reaction was almost immediate. Elon Musk offered a brief endorsement online, OpenAI's Sam Altman signaled agreement, and Google DeepMind co-founder Demis Hassabis called the proposal the right path forward, according to the complaint's own language as reported by The Hill. Amodei's essay went further still, floating the idea that Washington could grant a narrow waiver allowing rival labs to discuss safety measures without triggering antitrust liability — a suggestion the lawsuit now treats as the seed of an illegal arrangement.
Four Plaintiffs Build a Cartel Case
The suit was filed in the U.S. District Court for the Northern District of California by Florida attorneys Charles Buist and Nick Spetsas, California attorney Cheyenne Hunt — who previously helped bring public attention to misconduct allegations against former Rep. Eric Swalwell — and California resident Christine Bullock. According to a breakdown of the filing by Unite.AI, Buist, Spetsas and Hunt each hold paid subscriptions to Claude, ChatGPT, Grok and Gemini, while Bullock pays only for Claude. All four are suing individually while seeking to represent a broader nationwide class of paying subscribers.
Their argument leans on Section 1 of the Sherman Antitrust Act, which forbids competitors from agreeing to restrain output. The theory is straightforward: a pact among rivals to deliberately slow product improvement functions the same as a pact to limit supply, and the novelty of the technology does not exempt it from that rule. As the complaint puts it, according to Bloomberg Law's coverage of the filing, "a company that slows alone while rivals race ahead loses customers, revenue, talent, and technological leadership." Attorney Nick Rowley, who helped bring the case, argued that AI safety protocols cannot be left to "private self-serving agreements between the world's most powerful 'for profit' technology companies," as he told reporters, per Yahoo News. The plaintiffs are asking the court for class certification, an injunction blocking further coordination, and a declaration that the four companies broke the law.
Trump Calls Safety Fears a "Hoax"
President Donald Trump is not a party to the lawsuit, but his reaction has shaped the political climate around it. Two days after Amodei's essay, Trump took to Truth Social to dismiss fears of runaway AI, insisting the federal government already holds substantial regulatory and criminal authority over these companies and warning that any slowdown would simply hand an advantage to China. He also mocked Amodei directly, accusing the Anthropic chief of "pretending to be a 'perfect little angel,' as NBC News reported.
Congress and the Justice Department Split on Legal Cover
Amodei's push for antitrust breathing room found little traction on Capitol Hill. Senator Ted Cruz, chair of the Senate Commerce Committee, told a Senate Judiciary hearing that AI executives warning of existential risk while requesting protection from competition amounted to "just lunacy," according to The Hill. That same week, Senator Josh Hawley — backed by Cruz — moved to strip a related antitrust exemption for AI firms out of the National Defense Authorization Act, declaring afterward that there would be "no antitrust exemptions for AI, not a chance," as Forkast News noted.
Inside the administration, the signals have been more mixed. Speaking at Fordham University three days before the lawsuit was filed, Associate Attorney General Stanley Woodward said cooperation among AI companies specifically on cybersecurity issues "does not appear anticompetitive," per the Washington Examiner, though he stopped short of extending that reasoning to broader coordination on how quickly products are released. The Federal Trade Commission has taken a more skeptical tone, with FTC Chairman Andrew Ferguson warning that companies simultaneously lobbying for new regulation and antitrust relief raise concerns of their own.
What Happens Next
The lawsuit now proceeds against a backdrop in which the White House has waved off AI safety concerns as overblown, lawmakers have closed off one legislative path to industry-wide coordination, and a federal court is left to decide whether "pacing the frontier" was a legitimate safety measure or, as the plaintiffs contend, a dressed-up agreement among rivals to hold their own products back.
