Key Takeaways
- San Francisco federal court grants preliminary injunction halting Pentagon’s prohibition on Anthropic’s Claude AI system
- Judge Rita Lin determined the prohibition represents “classic illegal First Amendment retaliation”
- Conflict emerged when Anthropic declined to permit Claude usage for lethal autonomous weaponry or widespread surveillance operations
- As of 2025, Anthropic commanded 32% of enterprise AI markets, surpassing OpenAI’s 25% share
- Seven-day pause on injunction allows federal government opportunity to file appeal
A federal court has issued a temporary halt to the Trump administration’s prohibition on federal agencies utilizing Anthropic’s artificial intelligence technology, suspending actions the AI firm claimed would result in billions in revenue losses.
US District Judge Rita Lin, presiding in California’s Northern District, granted the preliminary injunction Thursday. The order includes a seven-day suspension period allowing federal authorities to pursue an appeal.
The legal dispute originates from a July 2025 agreement between Anthropic and the Department of Defense. Under that arrangement, Claude would have become the inaugural advanced AI system authorized for deployment on classified government networks.
By February 2026, negotiations had collapsed. Defense officials sought contract modifications requiring Anthropic to permit military Claude deployment “for all lawful purposes” without operational limitations.
Anthropic declined these terms. The company maintained its technology must not support lethal autonomous weapons systems or extensive domestic surveillance targeting American citizens.
President Trump issued an executive directive on February 27 prohibiting all federal departments from utilizing Anthropic products. His Truth Social post accused the company of making a “DISASTROUS MISTAKE trying to STRONG-ARM the Department of War.”
Subsequently, the Defense Department classified Anthropic as a national security supply chain threat. Anthropic initiated federal litigation in Washington, DC on March 9, contending Defense Secretary Pete Hegseth exceeded his statutory authority.
Court Challenges Government’s Justification
A 90-minute hearing convened in San Francisco on March 24. Judge Lin pressed government counsel regarding whether Anthropic faced punishment for publicly opposing Pentagon demands.
Judge Lin’s written decision stated the prohibition appeared unrelated to legitimate national security concerns. “If the concern is the integrity of the operational chain of command, the Department of War could just stop using Claude,” her ruling noted.
She further observed the government’s actions seemed “designed to punish Anthropic” and characterized them as “arbitrary, capricious, and an abuse of discretion.”
During proceedings, an Anthropic representative emphasized that Pentagon officials retain authority to evaluate any AI system prior to operational deployment. Additionally, Anthropic possesses no capability to disable a deployed model, modify its functioning, or monitor military applications.
Arguments From Both Parties
Government counsel contended Anthropic undermined trust throughout contract discussions by attempting to influence Pentagon operational policies. The attorney expressed concerns regarding potential “future sabotage” risks from Anthropic.
Judge Lin dismissed this rationale. She concluded the Justice Department lacked any “legitimate basis” for determining that Anthropic’s position on usage restrictions could transform the company into a security threat.
Menlo Ventures data shows Anthropic controlled 32% of enterprise AI markets in 2025, exceeding OpenAI’s 25% share. A comprehensive government prohibition threatened this market leadership position.
Anthropic expressed appreciation “to the court for moving swiftly.” The company simultaneously filed additional legal challenges in a Washington, DC appellate court, focusing on federal procurement regulations.
The litigation is identified as Anthropic v. US Department of War, 26-cv-01996, US District Court, Northern District of California.
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