March 9 - Anthropic has filed a lawsuit seeking to prevent the U.S. Department of Defense from adding the company to a national security blacklist, telling a federal court that the government action could sharply reduce the firm's revenue forecast for 2026 and harm its reputation with customers and investors.
In sworn federal filings, Anthropic's senior management laid out the financial stakes and the near-term commercial effects they foresee if the Pentagon's action is allowed to stand.
Chief financial implications
CFO Krishna Rao told the court that, across Anthropic's entire business and accounting for the varying likelihood that individual customers would respond in the most extreme way, the government's steps "could reduce Anthropic's 2026 revenue by multiple billions of dollars." Rao warned that allowing the designation to remain in place would produce consequences that are "almost impossible to reverse."
He added that, limited to work performed directly for the Department of Defense, Anthropic projects that "hundreds of millions of dollars in 2026 revenue may be at risk." Rao also said the designation would damage investor confidence and raise the company's cost of raising capital. In addition, he estimated that Anthropic could see a 50% to 100% decline in revenue from defense contractors and other customers with ties to the Defense Department.
Public sector revenue and reputational effects
Thiyagu Ramasamy, head of public sector, told the court the government's action "immediately and irreparably harm[s] Anthropic." In his filing he said the designation calls into question Anthropic's integrity and trustworthiness as a partner, and that effect would have a "real but incalculable" impact on sales to non-government customers.
Ramasamy quantified near-term losses tied to Defense Department work, saying the company expects "immediate loss of more than $150 million" in annual recurring revenue related to existing and anticipated contracts. He noted that Anthropic saw a fourfold increase in annual recurring revenue run rate from public sector customers between December 2025 and January 2026, and that business over the next five years had been projected to expand to "multiple billions."
Ramasamy cautioned that if defense contractors sever ties, Anthropic's expected public sector annual recurring revenue of more than half a billion dollars in 2026 could "shrink substantially or disappear altogether."
Commercial disruptions and customer reactions
Paul Smith, chief commercial officer, described specific commercial setbacks in his filing. He recounted that a partner with a multi-million-dollar annual contract moved from Anthropic's Claude model to a competing generative AI platform for a U.S. Food and Drug Administration deployment, eliminating an anticipated revenue pipeline "of more than $100 million."
Smith said negotiations with financial institutions representing roughly $180 million in potential revenue have been disrupted. He added that a $15 million contract was paused and that one fintech customer reduced its contract from $10 million to $5 million, telling the company the uncertainty created by the Pentagon situation made them unwilling to commit more spending on Claude.
Anthropic has also fielded inquiries from more than 100 enterprise customers expressing "deep fear, confusion and doubt" about the consequences of associating with the company, according to Smith's filing.
Legal posture and stakes
The lawsuit filed by Anthropic seeks to block the Pentagon's designation. In court filings, the company's executives framed the dispute as one that threatens both immediate revenue and longer-term relationships with enterprise and public sector customers, as well as investor support and the firm's ability to raise capital.
Those filings attribute potential impacts to several discrete channels: direct Department of Defense work, revenue from defense contractors and suppliers, public sector contracts that had been ramping rapidly, and enterprise deals in industries such as finance and fintech. The executives characterized some of the potential revenue losses in precise dollar terms and others in proportional terms, while warning that reputational effects on non-government customers are difficult to quantify.
The company's legal challenge seeks to prevent what its executives say would be an acute, possibly irreversible, commercial and reputational injury if the designation is permitted to take effect.