Anthropic, an AI firm, has filed a lawsuit to block the Pentagon from placing it on a national security blacklist, arguing that the move could significantly impact its 2026 revenue by multiple billions of dollars and cause reputational harm. The company is also in a high-stakes battle with the U.S. military over technology usage restrictions on its technology. The lawsuit comes as Anthropic continues to battle against the military over restrictions on technology usage. The firm predicts that hundreds of millions of dollars in revenue in 2026 may be at risk due to work performed for the Department of Defense. The actions could undermine investors' confidence in Anthropic and increase its costs to raise funds it needs to operate.