The Justice Department filed a response in federal court saying the government did not violate Anthropic's First Amendment rights when it flagged the AI developer as a supply-chain risk. The filing argues Anthropic's lawsuit is unlikely to succeed and asks the judge to deny the company temporary relief.
Quick background
Anthropic was hit with a government label that can block companies from defense contracts over security concerns. The label has already put potential revenue at risk for Anthropic and prompted legal challenges in two courts. One of those cases is in San Francisco, where Judge Rita Lin will hear arguments next Tuesday on whether Anthropic can keep doing business with the Pentagon while the case proceeds.
What the government is saying
Justice Department lawyers, writing for the Department of Defense and other agencies, told the court that Anthropic has no constitutional right to dictate how the government uses contracts. They described Anthropic's claim of irreparable financial harm as legally weak and asked the judge not to issue a reprieve.
The filing also says the administration acted because it worried about what Anthropic might do in the future if it retained access to military systems. The government says it has not limited Anthropic's speech, but that it reasonably believes Anthropic employees could sabotage or alter technology in ways that would harm national security.
What Anthropic says
Anthropic objects to restrictions on how the Pentagon can use its Claude models. The company has argued against using its AI for broad surveillance of Americans and says its models are not ready to operate fully autonomous weapons. Anthropic contends the supply-chain designation is an overreach that could cost the company large amounts of expected revenue this year.
Legal context and outside voices
Some legal experts have told reporters that Anthropic may have a strong argument that the label amounts to unlawful retaliation. Still, courts often defer to the government on national security matters, and Pentagon officials have emphasized that they view Anthropic as an untrusted contractor for sensitive systems.
Several outside groups and companies have filed briefs backing Anthropic. Those supporters include AI researchers, Microsoft, a federal employee labor union, and former military leaders. The government has not received similar amici support, according to filings.
Operational steps and timing
The Defense Department and other agencies are moving to replace Anthropic tools with alternatives from other tech firms in the coming months. One reported use of Anthropic's Claude is inside Palantir data analysis software that the military uses for planning and operations. The Pentagon says it is working to deploy AI systems from other providers, including Google, OpenAI, and xAI.
Anthropic has until Friday to file a formal reply to the government's latest brief. The judge will consider whether to pause the designation at the hearing next Tuesday.
Bottom line
The government says it acted out of national security concerns and that blocking Anthropic from sensitive military systems was reasonable. Anthropic says the move is improper and argues it will suffer major business harm if the designation remains in place. The court will decide which side gets temporary relief while the dispute plays out.
