Anthropic is asking a federal court in Washington, D.C. to rehear its appeal in a case concerning the Pentagon's blacklisting of the company's AI models. The company's attorneys filed a petition on Tuesday, arguing that a divided panel had upheld an "extraordinary designation" of Anthropic as a national-security 'supply chain risk' and ignored evidence that the designation was retaliation for Anthropic's speech about AI safety. The Defense Department applied the label in March, blocking defense contractors from using Anthropic's technology after negotiations broke down over the military's use of its Claude AI models. The D.C. Circuit upheld the blacklisting in September.