Anthropic CEO Dario Amodei published a statement today, addressing the latest developments in the company’s escalating dispute with the Department of War. The letter formally confirmed what had been circling for days: Anthropic has officially been designated a supply chain risk to America’s national security, and the company has no intention of backing down without a legal fight.
“As we wrote on Friday, we do not believe this action is legally sound, and we see no choice but to challenge it in court,” Amodei wrote.
The background here is important, folks. Anthropic had been operating under a $200 million contract with the Pentagon, and its Claude model was the first frontier AI approved for use on the military’s classified networks. Negotiations between Anthropic and the Department of War broke down over two narrow exceptions that Anthropic insisted on: it did not want its technology used for mass domestic surveillance of Americans or to power fully autonomous weapons capable of targeting and firing without a human in the loop. The Department of War wanted unrestricted access to Claude for all lawful purposes, and that is where the two sides hit a wall.
Secretary of Defense Pete Hegseth moved to designate Anthropic a supply chain risk after talks collapsed, and President Donald Trump directed all federal agencies to stop using Anthropic’s technology, allowing for a six-month phase-out period. Hegseth also declared that, effective immediately, no contractor, supplier, or partner doing business with the U.S. military could conduct any commercial activity with Anthropic. Anthropic pushed back on that interpretation immediately, arguing that the underlying statute, 10 USC 3252, is far narrower than Hegseth’s language suggests.
Amodei echoed that point in his March 5 statement, noting that the relevant law “exists to protect the government rather than to punish a supplier” and actually requires the Secretary of War to use the least restrictive means necessary to accomplish that goal. In plain terms, Anthropic is arguing that even the formal designation, if it were somehow found to be legally valid, does not give the Department the authority to ban all commercial activity between defense contractors and Anthropic. The company says it only applies to uses of Claude that are a direct part of contracts with the Department of War itself.
Amodei also addressed a leaked internal post that had made its way to the press, and he was unusually candid about it. He wrote that Anthropic did not leak the post, and acknowledged that its tone did not reflect his careful or considered views. He noted it was written within hours of Trump’s Truth Social announcement, Hegseth’s X post, and news of a deal between the Pentagon and OpenAI, which he described as a confusing day for the company. He called the post “an out-of-date assessment of the current situation.”
What makes this situation particularly unusual, folks, is that the supply chain risk designation has historically been reserved for foreign adversaries, not American companies. Anthropic is the first domestic company ever to receive such a label publicly. Legal experts have questioned whether the Department of War can even meet the statutory requirements for the designation, given that the dispute centered on contract terms rather than any actual technical threat to national security.
Amodei made clear that Anthropic intends to keep supporting warfighters and national security personnel for as long as it is allowed to do so, even offering its models at nominal cost with continuing engineering support during the transition. He also reiterated that the company has no objection to AI being used across a wide range of national security applications, including intelligence analysis, operational planning, cyber operations, and modeling and simulation. Its two red lines were, and remain, mass domestic surveillance and fully autonomous weapons.
The legal challenge ahead will take time. In the meantime, defense contractors that use Anthropic products in any capacity are now navigating real uncertainty about whether they need to certify they have cut ties with the company. That is no small thing when you consider that Anthropic has said eight of the ten largest American companies are Claude customers.
Reports as of March 5 indicate that talks between Anthropic and the Department of War may be back on, though the situation remains fluid. Claude models were also still reportedly being used to support ongoing U.S. military operations even after the blacklisting, which raises its own set of questions about how serious the designation truly is.
