Four Paying Subscribers Sued Anthropic, OpenAI, Google and SpaceXAI for Price-Fixing Over the AI Slowdown, Saying the Sept. 12 Agreement to Go Slower Was an Illegal Deal Among Competitors. 'The Antitrust Laws Do Not Permit Competitors to Decide Among Themselves That Competition Is Too Dangerous.'

The week-old agreement among the leading artificial intelligence companies to slow the pace of their own development is now the subject of a federal antitrust lawsuit. Four paying subscribers to ChatGPT, Claude, Gemini and Grok filed a proposed class action Friday in the U.S. District Court for the Northern District of California against Anthropic, OpenAI, Google and SpaceXAI, arguing that the companies' public pledge to decelerate amounts to an illegal agreement among competitors that leaves customers paying the same price for a product that is deliberately being made worse.

The complaint traces the alleged conspiracy to September 12, the day Anthropic chief executive Dario Amodei published an essay calling for industrywide cooperation to slow the release of more powerful models in favor of safety work. Amodei warned that "swarms of rogue AI agents could take over the internet" within six months if the industry did not change course. Within hours, OpenAI's Sam Altman, SpaceXAI's Elon Musk and Google DeepMind's Demis Hassabis had each publicly endorsed the idea. The suit also points to a July statement signed by senior staff at several labs acknowledging "intense competitive pressure not to unilaterally slow" development, which the plaintiffs read as evidence the companies knew none of them could afford to slow down alone.

"It is clear that an agreement among the chief rivals in AI that their progress 'should be slower than competition would otherwise produce' has an anticompetitive effect on consumers," the complaint says. Rather than each company deciding for itself what safety measures to adopt, the plaintiffs argue, the four took a "shortcut" by agreeing collectively. "The antitrust laws do not permit competitors to decide among themselves that competition is too dangerous," the filing states.

Amodei anticipated exactly this line of attack. In the essay itself he acknowledged that coordinated restraint among rivals raises antitrust problems and asked the federal government to mediate "or at least enable" the cross-lab talks, suggesting Washington would need to "issue a narrow waiver for certain kinds of safety conversations." No waiver has been issued. Altman, for his part, said OpenAI welcomes "a federal framework that sets consistent safety requirements," but added that "we do not believe we need to wait for an antitrust exemption or legislation to begin the work."

The political ground has not been friendly. President Trump dismissed the slowdown calls as a "conspiracy," asked why companies would want rules that could "drive them into oblivion," and told a crowd of technology investors in Los Angeles this week that the idea of AI taking over is "a hoax." He has since promised an AI task force and an "AI czar" without offering details. Senator Josh Hawley of Missouri, a Republican who has spent years attacking the size of the technology industry, said there is "no world" in which he would hand an antitrust exemption to "the most powerful companies in the history of the world."

Lead counsel for the plaintiffs is Nick Rowley, a trial lawyer known for large personal-injury verdicts. His public statement leaned on the very danger the companies invoked. "AI will quickly spin out of human control and could kill us all if we allow AI safety" to be decided by the companies themselves rather than by open competition and regulation, he argued. The suit seeks to represent every paying subscriber in the United States to the four companies' consumer AI products, a class that would number in the millions.

Representatives for Anthropic, OpenAI, Google and SpaceXAI did not respond to requests for comment on Saturday. The case lands in a court that has become the main venue for litigation against the AI industry, where judges are already handling copyright suits from authors, publishers and music labels. This is the first to argue that the companies' safety commitments themselves violate the law.

Markets have already registered the slowdown. Nvidia fell 3.4 percent and Micron 5.3 percent on the first trading day after Amodei's essay, while the software companies that buy the models rather than build them rose. Whether a jury ever hears the case will depend on early motions to dismiss, which the defendants are likely to file this fall.