Anthropic Wins Preliminary Injunction Against Pentagon — But the Fight Is Far From Over

Anthropic secured a preliminary injunction from a California federal court on Saturday, March 29. Judge Rita Lin temporarily blocked the Pentagon's attempt to designate the AI company as a "supply chain risk" — a label never before applied to an American company.

The conflict began when Anthropic refused to allow the Department of War to use Claude for mass surveillance of US citizens or in autonomous weapons systems. The Pentagon responded by declaring the company a supply chain security risk, threatening contracts worth over $200 million.

Judge Lin's 43-page ruling found that the Trump administration improperly punished Anthropic. Three contractors terminated their work with the company, and deals worth over $180 million collapsed.

However, lawyers and lobbyists warn against celebrating too early. A parallel case at the DC Circuit Court of Appeals could reach an entirely different conclusion. The Pentagon's designation rests on two separate statutes, and only one is covered by this ruling. "Practically speaking, not that much has changed," says Charlie Bullock, a lawyer at the Institute for Law and AI.

For the tech industry, the case creates uncertainty far beyond Anthropic. "As long as the cases are pending, businesses will not have 100% clarity," says a senior official at a tech trade association. The case effectively tests whether AI companies can set ethical boundaries on military use without being punished by the state.