Artificial intelligence company Anthropic filed a lawsuit on Monday seeking to prevent the United States Department of Defense from placing the firm on a national security blacklist. The legal action marks a significant escalation in the dispute between the AI developer and the U.S. military over restrictions on how its technology can be used.
In its filing with a federal court in California, Anthropic argued that the designation was unlawful and violated its constitutional rights, including free speech and due process. The company asked the court to overturn the Pentagon’s decision and prevent federal agencies from enforcing the blacklist.
Anthropic stated that the government’s actions were unprecedented and warned that punishing a company for its policy positions on AI use could set a troubling precedent. The firm argued that government power cannot be used to penalize protected corporate speech.
The Pentagon recently imposed a formal supply-chain risk designation on Anthropic, which limits the government’s ability to use the company’s technology. According to reports, the system had been used in military operations related to Iran. The decision followed months of tense discussions between the company and the Defense Department regarding limits on AI deployment.
The designation was reportedly approved by Pete Hegseth, after Anthropic refused to remove safeguards preventing its AI models from being used for autonomous weapons systems or domestic surveillance programs.
Despite the legal challenge, Anthropic indicated that it remains open to negotiating with the U.S. government. Company representatives said the lawsuit does not prevent renewed talks aimed at reaching a compromise. Officials from the Defense Department declined to comment on the case, while earlier statements suggested discussions between the two sides had already stalled.
The blacklist could significantly affect Anthropic’s government-related business. Analysts note that the case may also influence how other artificial intelligence companies structure agreements with the military regarding the use of advanced AI systems.
Anthropic CEO Dario Amodei clarified that the Pentagon’s designation currently applies only to certain defense-related activities. Companies and organizations may still use Anthropic’s technology in projects unrelated to the Defense Department.
Meanwhile, Donald Trump has instructed federal agencies to gradually stop working with Anthropic. The administration plans a six-month phase-out period for government contracts involving the company.
The dispute follows months of negotiations between the Pentagon and Anthropic over whether the company’s AI policies could limit military applications. U.S. defense officials have argued that national security decisions must ultimately be governed by federal law rather than the policies of private technology companies.
Anthropic maintains that even the most advanced AI systems are not reliable enough to operate fully autonomous weapons safely. The company has also drawn a firm line against the use of its technology for mass domestic surveillance, calling such applications a violation of fundamental civil liberties.
Following the Pentagon’s announcement, Anthropic warned that the decision could set a dangerous precedent for companies collaborating with government agencies. The firm said it would continue to challenge the designation in court.
In the past year, the Defense Department signed agreements worth up to $200 million each with several leading AI developers, including OpenAI and Google. Shortly after Anthropic’s blacklisting, OpenAI—backed by Microsoft—announced a deal to deploy its technology within Defense Department networks.
OpenAI CEO Sam Altman stated that the company supports military AI systems that maintain human oversight of weapon operations and oppose mass domestic surveillance.
