A federal appeals court on Friday declined to intervene in a Pentagon decision that blacklisted Anthropic from military contracts and labeled the artificial intelligence startup a national security risk, handing the company a significant setback in one of the most closely watched legal disputes in the AI sector.
The U.S. Court of Appeals for the District of Columbia Circuit refused to block the Defense Department order, allowing the designation to remain in place while Anthropic continues to challenge it in court. The case centers on the Pentagon's determination that Anthropic poses a national security supply chain risk, a label the company says has inflicted severe commercial damage and tarnished its standing at a critical moment in its corporate trajectory.
Anthropic said in a statement that it "respectfully disagrees" with the decision but remains confident in its position and is considering its options, including further judicial review. The company has argued that the designation has cost it billions of dollars in lost business, a claim that underscores the stakes of the dispute beyond the courtroom. For a startup preparing for a highly anticipated initial public offering, the reputational impact may be as consequential as the direct financial losses.
The appeals court ruling does not end the broader legal battle, but it preserves the Pentagon's authority to treat Anthropic as a security concern while the matter proceeds. That leaves the company facing continued uncertainty over its ability to pursue defense-related work and over how the government's stance may influence commercial customers, investors and partners weighing the risks of association with the firm.
The case has also become part of a wider debate over the government's power to regulate advanced AI companies, especially those whose models may be used in sensitive or dual-use settings. As AI systems become more deeply embedded in national security, defense procurement and critical infrastructure, the line between commercial innovation and strategic risk has grown increasingly contested. Anthropic's challenge has placed that tension squarely before the courts.
The legal fight is unfolding against a complicated backdrop. Last month, a federal judge in San Francisco struck down a parallel designation under a different law, finding that the administration had unlawfully retaliated against Anthropic for its views on AI safety. That ruling suggested at least one court was willing to scrutinize the government's treatment of the company and the motivations behind it. Friday's decision from the D.C. Circuit, however, shows that Anthropic has not yet secured a uniform judicial victory and may face a fragmented legal path ahead.
The conflicting rulings also highlight the possibility that the company's dispute with the government could continue across multiple legal theories and jurisdictions. While the San Francisco decision dealt a blow to one aspect of the administration's approach, the appeals court's refusal to halt the Pentagon designation leaves intact a separate and highly consequential national security finding.
For Anthropic, the timing is especially sensitive. The startup has emerged as one of the most prominent names in the generative AI industry, competing with larger rivals for enterprise customers, developer adoption and strategic partnerships. Any suggestion that the company is under a national security cloud could complicate those efforts, particularly as public-market investors scrutinize governance, regulatory exposure and the durability of AI business models.
The Pentagon's blacklisting also carries symbolic weight. Being deemed a supply chain risk by the Defense Department can signal to the market that a company is not merely facing a routine compliance issue but a deeper trust deficit in the eyes of the U.S. government. For a company whose products are built around frontier AI capabilities, that perception may reverberate far beyond defense contracting.
Anthropic has not said whether it will seek immediate further review, but its statement makes clear that the company intends to keep fighting. The appeals court decision, meanwhile, gives the Pentagon a temporary victory in a dispute that is likely to remain a closely watched test of how U.S. authorities police the intersection of AI, national security and corporate power.