Quick Summary
- California federal court grants preliminary injunction halting Pentagon’s prohibition on Claude AI technology from Anthropic
- Judge Rita Lin characterized the restriction as “classic illegal First Amendment retaliation”
- Conflict emerged when Anthropic declined to permit Claude’s use in lethal autonomous weapon systems or widespread surveillance operations
- Anthropic commanded 32% of enterprise AI sector in 2025, surpassing OpenAI’s 25% market share
- Seven-day pause on injunction allows federal government opportunity to file appeal
A California federal court has halted the Trump administration’s prohibition on Anthropic’s artificial intelligence technology within government operations, temporarily stopping restrictions the AI company claimed would eliminate billions in potential contracts.
BREAKING: Anthropic has been GRANTED a preliminary injunction re: Pentagon ‘supply chain risk’ designation by Judge Rita Lin in California but is allowing a stay for one week https://t.co/1xk41AB5zQ
— Hadas Gold (@Hadas_Gold) March 26, 2026
US District Court Judge Rita Lin in San Francisco’s Northern District of California granted the preliminary injunction Thursday. The court order includes a seven-day hold period allowing federal authorities to pursue an appeal.
At the heart of the dispute lies a July 2025 agreement between Anthropic and the Department of Defense. Under this arrangement, Claude would have become the initial advanced AI system authorized for deployment on classified military networks.
Contract discussions collapsed in February 2026. Defense officials sought to revise terms, insisting Anthropic permit unrestricted military deployment of Claude “for all lawful purposes” without limitations.
Anthropic declined the demand. The firm maintained its position that Claude should be prohibited from powering lethal autonomous weapons platforms or enabling mass surveillance of American citizens.
President Trump directed all federal departments to cease using Anthropic’s products on February 27. In a Truth Social post, he declared the company committed a “DISASTROUS MISTAKE trying to STRONG-ARM the Department of War.”
Following the presidential directive, the Defense Department labeled Anthropic as a national security supply chain threat. Anthropic responded by filing suit in Washington, DC federal court on March 9, contending Defense Secretary Pete Hegseth exceeded his legal authority.
Court Challenges Government’s Justification
Judge Lin presided over a 90-minute hearing in San Francisco on March 24. During proceedings, she pressed federal attorneys about whether Anthropic faced punishment for publicly opposing Pentagon demands.
Lin’s written decision stated the prohibition seemed unrelated to genuine national security considerations. “If the concern is the integrity of the operational chain of command, the Department of War could just stop using Claude,” her ruling explained.
The judge further determined the government’s actions seemed “designed to punish Anthropic,” describing them as “arbitrary, capricious, and an abuse of discretion.”
During court proceedings, an Anthropic representative emphasized that the Pentagon maintains authority to evaluate any AI system prior to deployment. Additionally, Anthropic possesses no technical capability to disable a model remotely, alter its functionality, or monitor military applications.
Legal Arguments From Both Parties
Federal counsel contended Anthropic undermined the relationship during negotiations by attempting to impose policy constraints on the Pentagon. Government attorneys expressed concerns about potential “future sabotage” risks from the AI company.
Judge Lin dismissed this justification. Her ruling stated the Justice Department lacked any “legitimate basis” for concluding Anthropic’s ethical position on usage restrictions indicated sabotage potential.
According to Menlo Ventures data, Anthropic controlled 32% of the enterprise artificial intelligence market in 2025, outpacing OpenAI’s 25% share. A comprehensive federal ban threatened to significantly erode this market leadership.
Anthropic expressed appreciation “to the court for moving swiftly.” The company simultaneously pursued a second legal challenge through an appellate court in Washington, DC, concentrating on federal procurement regulations.
The litigation is filed as Anthropic v. US Department of War, 26-cv-01996, US District Court, Northern District of California.
