Why did a U.S. appeals court uphold the Pentagon’s designation of Anthropic as a national security supply-chain risk in September 2026, how did the dispute over AI guardrails for autonomous weapons and mass domestic surveillance shape the court’s 2–1 ruling and its rejection of A

The D.C. Circuit upheld the Pentagon’s designation on September 25, 2026, because its 2–1 majority accepted the department’s concern that Anthropic’s limits on Claude could interfere with battlefield readiness. The court rejected Anthropic’s argument that the designation was retaliation for its AI-safety views. 13

• The dispute: Anthropic would not permit Claude to be used for autonomous weapons or mass domestic surveillance. The Pentagon treated those limits as a risk to its ability to rely on the technology for military work; Anthropic characterized the resulting designation as punishment for its position on AI safety. The majority accepted the Pentagon’s readiness rationale rather than the retaliation claim. 3
• Practical effect: The ruling lets the Pentagon continue excluding Claude from its systems and restricting its use in defense work, including military contracts. 48
• Anthropic’s response and next steps: The supplied evidence does not establish Anthropic’s exact response or whether it has sought further review. A further challenge is possible, but it should not be treated as a step already taken.
• Separate California case: The Washington ruling did not itself overturn an earlier San Francisco judge’s decision lifting a broader government ban. That ruling appeared to remain in place as of September 25, leaving the Pentagon-specific exclusion and the broader restrictions on different legal footing. 2