Key Takeaways
- San Francisco federal court granted preliminary injunction stopping Pentagon prohibition on Anthropic’s Claude AI technology
- Judge Rita Lin characterized the prohibition as “classic illegal First Amendment retaliation”
- Conflict originated when Anthropic declined military demands to permit Claude usage for lethal autonomous weapons and mass surveillance
- Enterprise AI market data from 2025 showed Anthropic commanding 32% share, surpassing OpenAI’s 25%
- Court order suspended for seven days, providing government opportunity to file appeal
A California federal judge has intervened to halt the Trump administration’s prohibition on Anthropic’s AI technology across government agencies, temporarily stopping measures the company warned could eliminate billions in potential revenue.
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 the Northern District of California delivered the preliminary injunction this Thursday. The order carries a seven-day suspension period, allowing federal authorities time to pursue appellate remedies.
The legal battle traces back to a July 2025 agreement between Anthropic and Pentagon officials. Under that arrangement, Claude would have become the inaugural frontier AI model authorized for deployment on classified military networks.
The partnership collapsed in February 2026 when Pentagon officials sought to restructure the terms. Military brass demanded that Anthropic permit Claude deployment “for all lawful purposes” while eliminating previous restrictions.
Anthropic declined the revised terms. Company leadership maintained that Claude should remain prohibited from powering lethal autonomous weapons systems and conducting widespread domestic surveillance operations targeting American citizens.
President Trump directed all federal departments to cease Anthropic product usage on February 27. His Truth Social post accused the company of making a “DISASTROUS MISTAKE trying to STRONG-ARM the Department of War.”
The Defense Department subsequently classified Anthropic as a national security supply chain threat. Anthropic responded by filing federal court papers in Washington, DC on March 9, challenging Defense Secretary Pete Hegseth’s authority to impose such designations.
Court Scrutinizes Government Justification
Judge Lin presided over a 90-minute hearing in San Francisco on March 24. She pressed government attorneys about whether the company faced punishment for publicly opposing Pentagon demands.
Lin’s written decision stated the prohibition seemed disconnected from genuine national security objectives. “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 order further described the measures as appearing “designed to punish Anthropic” while deeming them “arbitrary, capricious, and an abuse of discretion.”
An Anthropic legal representative emphasized during proceedings that Pentagon officials maintain complete authority to evaluate any AI model before operational deployment. The company possesses no technical capability to deactivate a model remotely, alter its functionality, or monitor military applications.
Arguments From Each Party
Government counsel contended that Anthropic undermined the trust relationship during contract discussions by attempting to impose conditions on Pentagon operations. The attorney expressed concerns about potential “future sabotage” risks from the AI company.
Judge Lin dismissed this rationale. Her ruling stated the Justice Department lacked any “legitimate basis” to deduce that Anthropic’s ethical boundaries could transform the company into a sabotage threat.
Market analysis from Menlo Ventures placed Anthropic’s enterprise AI market share at 32% as of 2025, outpacing OpenAI’s 25%. A comprehensive government prohibition threatened to undermine this competitive advantage.
Company representatives expressed being “grateful to the court for moving swiftly.” Anthropic simultaneously pursued a parallel complaint in a Washington, DC appellate court, concentrating on federal procurement regulations.
The case designation is Anthropic v. US Department of War, 26-cv-01996, US District Court, Northern District of California.
