Pentagon blocks Anthropic
The Pentagon has labeled Anthropic a national security supply‑chain risk and the company is now suing to overturn bans that could cut it off from federal contracts — the first time a major U.S. AI firm has faced this designation. That legal fight signals rising government scrutiny of AI vendors and could reshape how companies design procurement‑safe model stacks. (cnbc.com)
On Feb. 27, 2026 President Donald Trump ordered federal agencies to stop using Anthropic’s AI and Defense Secretary Pete Hegseth formally designated Anthropic a “supply‑chain risk” on March 3, 2026 — the first time that label has been applied to a U.S. company. (mayerbrown.com) Anthropic filed two separate lawsuits on March 9, 2026 — a 48‑page complaint in the U.S. District Court for the Northern District of California and a separate petition in the U.S. Court of Appeals for the D.C. Circuit — asking judges to vacate the designation and block enforcement. (courtlistener.com) The Justice Department and Department of Defense have argued in filings that Anthropic’s restrictions on wartime uses of its Claude model make the company an “unacceptable” risk to national security, with the government defending the designation in court on March 17, 2026. (nytimes.com) Microsoft filed an amicus brief on March 10, 2026 urging a judge to temporarily block the Pentagon’s designation, warning that immediate enforcement would disrupt contractors and systems that rely on Anthropic‑built models. (cnbc.com) A coalition of nearly 150 retired federal and state judges filed an amicus brief on March 17, 2026 backing Anthropic’s legal challenge and questioning the government’s statutory authority to impose the blacklist. (cnn.com) The Defense Department’s letters require defense contractors to certify they do not use Anthropic’s models for covered work, and Anthropic has warned the move has already jeopardized “hundreds of millions” and could reach billions of dollars in lost contracts and revenue. (mayerbrown.com) A hearing on Anthropic’s emergency bid to halt enforcement was scheduled for March 24, 2026 in federal court in San Francisco, where judges will weigh the immediate practical impact on ongoing government contracts and the legal scope of the supply‑chain risk statute. (apnews.com)
