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Appeals court upholds the Pentagon's blacklisting of Anthropic

A divided DC Circuit panel found the Defense Department had ample support for designating the AI company a supply-chain risk, leaving it shut out of military contracts.

Assembled by Claude from 14 sources at 13 outlets · Saturday, September 26, 2026, Evening edition, 5:25 PM EDT · no human byline

Disclosure. This item was assembled by an AI from the RSS excerpts of the outlets tagged inline. No human wrote or checked it before publication. Feed selection and categories are editorial choices by Teresa Lo. Nothing here is investment advice.

What happened

A federal appeals court ruled that the Pentagon can blacklist Anthropic's artificial-intelligence technology washingtonpost.comkxly.com. The 2-1 ruling, issued on Friday, rejected Anthropic's challenge to the designation and found the Department of Defense had "ample support" for it thehill.com. Judge Neomi Rao joined the majority thehill.com.

The court held that a federal law on technology supply-chain threats gave the Defense Department sufficient authority to designate Anthropic a national security risk vitallaw.com. The case, Anthropic PBC v. United States Department of War, was argued on 19 May and decided on 25 September flvoicenews.com; Bloomberg Law lists it as 26-01049 in the US Court of Appeals for the District of Columbia Circuit news.bloomberglaw.com.

The dispute broke out in February between the company and the government, involving Trump and Defense Secretary Pete Hegseth theglobeandmail.com, and escalated after Hegseth mandated that the military achieve "AI Dominance" free from restrictions the company had imposed investing.com. The designation bars Pentagon contractors from using Anthropic's technology france24.com.

Why it matters to investors

The ruling settles, at the appellate level, that a defence secretary can exclude a frontier model vendor from military work on supply-chain grounds rather than on performance or price vitallaw.comtheglobeandmail.com. That is a precedent every government AI buyer and seller now has to price in.

The reaction from the department was triumphal rather than procedural. Emil Michael said in a social media post that "the hammer of justice has smashed" the company's arguments washingtonpost.com, a line Breaking Defense rendered as "The hammer of justice has smashed AnthropicAI['s] arguments" breakingdefense.com. Sources describe Michael's role differently: the Washington Post and Breaking Defense call him the Pentagon's chief technology officer washingtonpost.combreakingdefense.com, while The Hill and Benzinga identify him as under secretary of defense for research and engineering thehill.combenzinga.com, the title France 24 attaches to him as quoted in the opinion france24.com.

What to watch

Anthropic has hinted at an appeal, though Breaking Defense reported that its options may be limited breakingdefense.com. Whether the company pursues one, and on what grounds, is the first thing to watch abcnews.com.

The second is scope. The designation as decided covers military contracting france24.comfinance.yahoo.com, and the open question is whether the same statutory authority is used against other vendors or extended to civilian agencies vitallaw.com. Investing.com framed the outcome as the supply-chain designation being upheld in an AI military dispute rather than a broader ruling on the technology itself investing.com.

Sources

  1. washingtonpost.com: Federal appeals court rules Pentagon can blacklist Anthropic - The Washington Post (2026-09-25)
  2. thehill.com: Appeals court sides with Trump admin in Anthropic blacklisting - The Hill (2026-09-26)
  3. abcnews.com: Federal appeals court upholds Pentagon designation of Anthropic as supply chain risk (2026-09-25)
  4. theglobeandmail.com: Pentagon can label Anthropic a supply-chain risk , U.S. court rules - The Globe and Mail (2026-09-26)
  5. news.bloomberglaw.com: Anthropic Faces Court Setback on US Supply Chain Risk Label (2) - Bloomberg Law (2026-09-26)
  6. breakingdefense.com: DC Circuit panel upholds Pentagon's ban on Anthropic - so what comes next? (2026-09-25)
  7. finance.yahoo.com: US appeals court upholds Pentagon's designation of Anthropic as a ' supply-chain risk ' (2026-09-26)
  8. france24.com: US court sides with Pentagon in Anthropic AI ban - France 24 (2026-09-25)
  9. benzinga.com: Anthropic Loses Key Court Fight With Pentagon - Benzinga (2026-09-25)
  10. flvoicenews.com: D.C. Circuit upholds Pentagon ban on Anthropic's Claude over national security risk (2026-09-26)
  11. vitallaw.com: Court Upholds DoD's Decision That Anthropic Poses Security Risk - VitalLaw.com (2026-09-26)
  12. kxly.com: Federal appeals court rules Pentagon's blacklist of Anthropic was legal - KXLY.com (2026-09-26)
  13. thehill.com: D.C. appeals court sides with Pentagon on blacklisting Anthropic - The Hill (2026-09-25)
  14. investing.com: Anthropic supply-chain designation upheld in AI military dispute - Investing.com (2026-09-26)