A fresh antitrust lawsuit in the US has alleged some of the largest artificial intelligence firms have colluded. Anthropic, OpenAI, SpaceXAI (xAI) and Google have been alleged to have come together to slow down AI development by the plaintiffs – but the plaintiffs say this could suppress competition and harm the benefits that paying users get.
The plaintiffs filed the lawsuit on 18 September 2026 in the United States District Court for the Northern District of California. The proposed class action is made up of four AI service users, including ChatGPT, Claude, Grok and Gemini, who subscribe to services including ChatGPT, Claude, Grok and Gemini.
AI Companies Accused of Coordinating Development
This case ultimately raises a question that has been of increased relevance to the tech industry: how fast should AI be deployed?
The complaint alleges this coordination was especially apparent after Anthropic CEO Dario Amodei published an essay urging the tech industry to work together to slow the rate of improving AI capabilities on September 12. Amodei stated the increased funding was necessary to allow the industry to help make the systems safer and implement better oversight.
CEO of OpenAI Sam Altman, SpaceXAI CEO Elon Musk and Google Deep Mind co-founder Demis Hassabis then released public statements supporting parts of the settlement. But according to the lawsuit, those statements helped to coordinate the pace of product development among the competitors.
But they have not been established by the court and remain allegations in the suit.
Why the Lawsuit Raises Antitrust Questions
US antitrust law focuses on the suppression of agreements between competitors that distort markets – or, at its most basic, the mutual reduction of competition. They say the agreement among the AI companies to curb AI progress would have an anticompetitive effect.
The alleged coordination over the pace of improvement of competing AI products is explicitly singled out in the complaint. “Slower development may eventually have an impact on consumers in the form of monthly fees for AI services,” the plaintiffs write.
So the case raises a rare anti-trust issue: whether collaboration designed to mitigate the risks of AI safety can become problematic if rival firms conspire together to slow the progress of technological advancement.
Legal professionals and industry analysts will probably be following this distinction closely as the case develops.
Anthropic’s AI Safety Proposal
The coordinator in the crosshairs of the controversy is Anthropic CEO Dario Amodei. His plea was not to halt AI research but for companies to slow down in their pursuit of capabilities even as they proceed with scientific advancement.
His proposal involved increased independent scrutiny, cooperation on AI safety standards and international co-operation on emerging AI risks.
Amodei recognised that collaborations across competitors might attract anti-trust issues, and mentioned some form of government-led work or limited legal permissions may be necessary to facilitate some safety conversations between AI labs.
OpenAI and Other Leaders in Artificial Intelligence Join the Debate
OpenAI also backed efforts to set out standard safety requirements for artificial intelligence. “We support a federal framework that would establish a common set of safety requirements, and would not argue that work on AI safety standards should have to wait until legislation,” said Sam Altman.
On a wider scale though, the tech industry continues to be split on slowing AI growth via coordinated actions.
Latest: Some tech executives favor greater industry-wide cooperation, measures, and safety precautions, but some contend that tech firms should be able to control their own AI safety without a hold on the entire sector.
This raise underscores the tension between those two goals: innovation at speed and the mitigation of potential risks from more and more powerful AI systems.
The Potential Impact of the Lawsuit on AI Competition
But the case might extend beyond the four firms that are parties to the complaint. If legal action is taken later on to determine whether AI safety conversations between competing tech firms could run afoul of antitrust law, it might shape how firms work together on future safety regulations.
The case also underscores how subscriptions to AI is becoming increasingly lucrative. Audiences of millions-both for consumers and corporate clients-are using popular apps like ChatGPT, Claude, Gemini, and Grok for their research, writing, coding, and more.
According to the plaintiffs, customers should remain in the position to enjoy competition between various A.I. makers. They argue that firms should not join together to collectively dictate how rapidly rival products will catch up to each other outside the context of an appropriate government body or regulators.
AI Safety Compared to Competition: A Novel Legal Fight
The lawsuit arrives at a moment when governments and tech firms are grappling to set rules for growing strong A.I. models. Safety benchmarks, independent testing, regulation and competition are all becoming intertwined concerns.
At this stage, the allegations are merely allegations contained within the latest lawsuit. A court will have to weigh the facts and legal arguments before deciding whether the defendants infringed US antitrust law.
But the suit may still serve as a major experiment in whether America’s antitrust laws are up to the task of overseeing AI safety coordination – and whether a technology duopoly can work together without running afoul of the competition laws.
