US appeals court refuses to block Pentagon's blacklisting of Anthropic

THE DECODER / 4/9/2026

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Key Points

  • A US appeals court refused to issue a temporary block against the Pentagon’s designation of Anthropic as a national security risk.
  • The court’s decision means the Pentagon’s blacklisting action can proceed while the legal dispute continues.
  • The ruling intensifies scrutiny of major AI providers’ roles and data/security posture in defense-related contexts.
  • Reuters reports the case as a significant test of how national security designations are reviewed in court.

A US appeals court has declined to temporarily block the Pentagon's designation of Anthropic as a national security risk, Reuters reports.

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