The story so far
written Sep 26What is happening
The U.S. Court of Appeals for the D.C. Circuit ruled on Sept. 25, 2026, that the Department of Defense (DoD) may maintain its "supply chain risk" designation against Anthropic [6][7]. This 2-1 decision allows the Pentagon to continue prohibiting its personnel and contractors from using Claude AI [6][11]. The ruling restricts the company's access to defense contracts while Anthropic reportedly prepares for an initial public offering before the end of 2026 [6].
What to watch
Anthropic may now file a petition for rehearing with the D.C. Circuit or a petition for certiorari to the U.S. Supreme Court to challenge the ruling [10]. The case will conclude if the Supreme Court denies a hearing or issues a final opinion, or if the DoD issues a final order to confirm or rescind the risk designation [10]. A separate August 2026 ruling from the Northern District of California, which invalidated the risk label for non-military federal agencies, remains in effect as the government has not appealed that decision [6].
Read the full brief · how we got here
How we got here
The litigation began in March 2026 after the Trump administration labeled Anthropic a security risk [1][6]. The designation followed the company's refusal to permit military use of its artificial intelligence models for autonomous weapons and domestic surveillance [1][6]. Before this appellate ruling, the company had successfully challenged the label in a California district court, which allowed non-defense agencies to continue using its technology [6].
References · 5
- [1]anthropic-v-dow.vercel.app — Documents · Anthropic v. Department of War
- [6]cnn.com — Federal appeals court rules Pentagon's blacklist of Anthropic ... - CNN
- [7]cnbc.com — U.S. appeals court upholds Pentagon designation of Anthropic as supply ...
- [10]breakingdefense.com — DC Circuit panel upholds Pentagon's ban on Anthropic - so what comes ...
- [11]apnews.com — Federal appeals court lets Pentagon keep Anthropic's label as supply ...
What would close this
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newest firstWhen we started following: D.C. Circuit upholds Pentagon blacklist of Anthropic AI technology
The U.S. Court of Appeals for the D.C. Circuit ruled on Sept. 25, 2026, that the Department of Defense may maintain its "supply chain risk" designation against Anthropic [6][7]. The 2-1 decision permits the Pentagon to prohibit the use of Claude AI by its personnel and contractors [6][11]. The litigation began in March 2026 after the Trump administration labeled the company a risk following Anthropic's refusal to allow military use of its models for autonomous weapons and domestic surveillance [1][6].
While the D.C. Circuit ruling enforces the ban within the Department of Defense, a separate August 2026 ruling from the Northern District of California partially invalidated the label for other federal agencies [6]. The government has not appealed that California decision, allowing non-military agencies to continue working with the company [6]. Anthropic is reportedly considering an initial public offering before the end of 2026 [6].