Anthropic sues Pentagon over Claude ban
Judge questions whether Hegseth supply chain warning is punitive, government argues its own blacklist threat is not real
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Unwinding the Claude AI tool from US military applications could prove to be a daunting task. Photograph: Koshiro K/Shutterstock
theguardian.com
Anthropic and the US Department of Defense argued in federal court in northern California on Tuesday over whether the Pentagon can effectively blacklist the company’s Claude AI model across the military and its contractors. The Guardian reports that Anthropic is seeking a temporary injunction after Defense Secretary Pete Hegseth declared the firm a “supply chain risk” and President Donald Trump ordered agencies to stop using its tools.
The dispute started with Anthropic’s refusal to allow Claude to be used for domestic mass surveillance and fully autonomous lethal weapons systems, according to the Guardian. The Pentagon’s response—branding a US supplier a supply-chain risk and warning contractors off—turns a policy disagreement into a procurement weapon. Anthropic says the designation will cause “irreparable harm” and cost it hundreds of millions of dollars, and argues the government is punishing protected speech.
Judge Rita Lin signaled skepticism about the government’s posture, describing the case as a “fascinating public policy debate” but focusing on legality. She questioned whether the Pentagon’s actions went beyond choosing not to buy a product and instead crossed into punitive territory. When government lawyers argued that Hegseth’s social-media post had no legal force and contractors would not face consequences for ignoring it, Lin pressed the contradiction: “We said it, but we didn’t really mean it.” Asked why the defense secretary would post such a claim if it had no effect, the government lawyer said: “I don’t know.”
The practical problem is that Claude is already embedded. The Guardian notes the US government has relied heavily on the model over the past year, including in military operations against Iran, making “unwinding” its use a non-trivial task. That dependence gives the state leverage in one direction—threatening revenue and market access—and gives the vendor leverage in the other—forcing agencies to explain how they will replace a tool they have operationally integrated.
The hearing is an early step; Lin has yet to rule on the injunction. For now, the Pentagon is arguing in open court that its own public warning should not be treated as binding.
Hegseth’s post is still online, and Anthropic is still asking a judge to make it stop mattering.