Anthropic Sues U.S. Defense Department Over Blacklisting, Files Lawsuit Today

Anthropic’s lawsuits target the Pentagon’s newly minted “supply‑chain risk” designation, the first time the blacklist has been applied to a U.S. firm, according to The Guardian. The company argues the label—issued last Thursday—forces any contractor dealing with the Defense Department to sever ties with Anthropic, jeopardizing its commercial model and violating its First Amendment rights.

In its California complaint, Anthropic claims the Trump administration is retaliating for the firm’s refusal to permit unrestricted military use of its Claude model, especially for mass domestic surveillance or fully autonomous lethal weapons. “These actions are unprecedented and unlawful,” the filing states, echoing the company’s view that the government is punishing protected speech, The Guardian reports.

The Verge notes that Claude has been deeply integrated into DoD operations for the past year and was, until recently, the only AI approved for classified systems. Pentagon officials have reportedly used the model to help decide missile‑strike targets in the ongoing conflict with Iran, highlighting the strategic importance of the technology.

Anthropic’s legal team contends that the blacklist is an attempt to “destroy the economic value” of one of the fastest‑growing private AI firms, a claim also cited by The Verge. The suit seeks to block the designation and prevent the DoD from imposing its “red lines” on acceptable AI use, arguing that such constraints infringe on constitutional protections.

Both filings were lodged in the Northern District of California and the D.C. Circuit Court of Appeals, signaling a high‑stakes legal battle that could set precedent for how government procurement policies intersect with corporate speech rights, as detailed by The Guardian.