Anthropic, OpenAI, SpaceXAI, Google sued for alleged collusion to slow AI development

San Francisco, September 18 — A closely watched civil lawsuit was filed in the U.S. District Court for the Northern District of California, naming four leading AI companies—Anthropic, OpenAI, SpaceXAI, and Google—as defendants. Four paid users of Claude, ChatGPT, Grok, and Gemini respectively have brought the case, seeking class-action status on a national scale. The plaintiffs allege that the companies entered into an illegal agreement to collectively slow the pace of AI technology development, in violation of U.S. antitrust laws.

Core Dispute: A Coordinated Call for AI Safety

The central controversy revolves around a public consensus on AI safety. On September 12, Anthropic CEO Dario Amodei published a statement warning of severe risks posed by frontier AI technology and called for slowing the pace of advanced model development to prioritize safety controls. On the same day, OpenAI CEO Sam Altman, SpaceXAI's Elon Musk, and Google DeepMind co-founder Demis Hassabis each publicly expressed support for this position.

Plaintiffs' Argument: Collusion, Not Coincidence

The plaintiffs argue that these synchronized public statements were not coincidental alignment of views but rather a coordinated action among competitors reached through prior agreement. The complaint traces the issue back to July 2026, when executives from multiple U.S. AI companies jointly signed a statement acknowledging that intense competitive pressure made it impossible for any single company to unilaterally halt research and development. The same statement called on the U.S. government to promote global AI regulation. Based on this, the plaintiffs contend that the companies had long been cultivating a tacit understanding to "collectively decelerate."

Legal Basis: Sherman Act Violation

The plaintiffs do not dispute that companies may voluntarily slow their own model development for safety reasons. However, the key legal issue is whether competing companies crossed a red line by reaching an agreement to jointly limit product capability improvements. Such conduct would allegedly violate Section 1 of the Sherman Act, which prohibits contracts and conspiracies that restrain trade or weaken market competition.

Deeper Concerns Raised by Lead Counsel

Nick Rowley, the plaintiffs' lead attorney, expressed broader concerns. He argued that if AI safety and technical standards are negotiated privately among the world's most influential for-profit technology companies, the direction of AI development could be controlled by a small number of industry giants. This, he warned, could ultimately increase the risk of AI escaping human control. In essence, Rowley suggested that major players using "safety" as a pretext to simultaneously apply the brakes on research could reduce intense technological competition while also locking in the current industry structure and suppressing opportunities for potential challengers.

Market Reaction and Tensions

Following the case's exposure, market discussions have intensified. AI safety is widely recognized as a global consensus, and many industry insiders acknowledge that frontier models carry unpredictable risks requiring safety measures. However, the fundamental logic of antitrust law is to protect market competition. The tension between technological safety ethics and market competition rules makes this lawsuit particularly compelling.

Uncertain Outcome and Key Challenges

The case's trajectory remains highly uncertain. The most significant evidentiary challenge is proving the existence of an "agreement" as defined under antitrust law. Simply having converging views among executives or making similar public statements does not directly constitute illegal collusion. The court must determine whether the synchronized statements were based on independent judgment within an industry consensus or whether there was private communication and an agreement to restrict competition.

Status and Potential Implications

As of September 19, none of the four defendant companies have responded to the lawsuit. If the plaintiffs prevail, the companies could face civil damages, and the entire global AI industry's safety communication mechanisms could be reshaped. Going forward, AI giants would need to be more cautious about antitrust scrutiny when publicly discussing technology slowdowns or industry self-regulation.

Broader Industry Question

The lawsuit also raises a fundamental industry question: Should AI safety governance be determined through voluntary industry coordination, or should it rely on uniform rules set by regulatory authorities? The answer to this question—playing out in a U.S. courtroom—awaits the trial's outcome. The verdict could profoundly impact the competitive landscape and regulatory direction of the global large-model AI industry.

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