A federal judge in California ruled Thursday that the Pentagon's blacklisting of artificial intelligence firm Anthropic was illegal, in a landmark decision that pits AI safety principles against government procurement power.

Judge Rita Lin of the U.S. District Court for the Northern District of California issued a 59-page ruling finding that the Trump administration retaliated against Anthropic for its "constitutionally protected activity" — specifically, the company's public stance that its Claude AI model should not be used for fully autonomous lethal weapons or mass surveillance of Americans.

"Though the Department of War is undisputedly free to select the AI vendor of its choice, the evidence demonstrates that the broad measures imposed on Anthropic were illegal and baseless," Lin wrote.

The dispute began earlier this year when Anthropic and the Pentagon clashed during contract negotiations over safety guardrails. Anthropic insisted its technology not be used in autonomous lethal weapons or for mass domestic surveillance, while the Pentagon demanded it be allowed to use Claude for "all lawful uses." When negotiations broke down, Defense Secretary Pete Hegseth directed offices to cease using Anthropic's products and designated the company a supply chain risk.

"America's warfighters will never be held hostage by the ideological whims of Big Tech," Hegseth said at the time.

Anthropic sued, arguing the designation was retaliatory. Lin agreed, finding that CEO Dario Amodei's public comments on AI safety were "consistent with a longstanding practice of public speech" and not unprotected commercial speech during contract negotiations as the DOJ had argued.

"Neither the Constitution nor the federal statute invoked by defendants allows them to impose sweeping penalties based principally on Anthropic's critique of the Administration's views," Lin wrote.

The ruling wraps up the case in California, though Anthropic has a parallel suit pending in the D.C. Circuit Court of Appeals. The decision sets an important precedent for how AI companies can publicly advocate for safety limitations without risking government retaliation.

Anthropic said it "welcomed" the ruling and "remains focused on working productively with the government to harness AI for our national security."

Sources