The history of the deterioration of relations between Anthropic and the U.S. government has been revealed through emails submitted in court, including the contents of emails between CEO Dario Amodi and Pentagon officials.

Anthropic had a contract with the U.S. Department of Defense regarding the use of AI, but on February 28, 2026, the Department of Defense and the U.S. government
Read the Tense Emails Between the Pentagon (Former Uber Exec) and Anthropic (Dario Amodei)
https://gizmodo.com/read-the-tense-emails-between-the-pentagon-former-uber-exec-and-anthropic-dario-amodei-2000780849
Anthropic Vs Pentagon Emails : Free Download, Borrow, and Streaming : Internet Archive
https://archive.org/details/anthropic-vs-pentagon-emails/
Anthropic had been providing AI systems to the Department of Defense, but restricted their use for 'massive domestic surveillance' and 'fully autonomous weapons.' Secretary of Defense Pete Heggesseth strongly urged Anthropic to lift these restrictions, but CEO Amodi refused . As a result, on February 28, 2026, President Donald Trump posted on True Social that 'Anthropic's left-wing fanatics tried to force the Department of War (Department of Defense) to comply with Anthropic's terms of service instead of the Constitution,' and ordered all government agencies to stop using Anthropic products. Furthermore, Secretary of Defense Heggesseth designated Anthropic as a 'supply chain risk to national security' and declared the termination of the contract.
President Trump claims Anthropic's left-wing fanatics attempted to control the U.S. military and orders severance of ties; Secretary of Defense Heggesses to designate Anthropic as a 'supply chain risk' - GIGAZINE

Anthropic argues that the designation as a supply chain risk lacks legal justification and has filed a lawsuit against the Department of Defense seeking to have the designation removed.
Anthropic sues the U.S. Department of Defense; OpenAI and Google employees express support for Anthropic - GIGAZINE

Documents submitted to the court in connection with the lawsuit between Anthropic and the Department of Defense were made public on June 30, 2026. The documents include email exchanges between CEO Amodi and Emil Michael, the Department of Defense's chief technical officer, and reveal the history of the deterioration of relations between Anthropic and the Department of Defense.
The following is an excerpt from the released email. It shows that on December 4, 2025, CEO Amodi sent a message to Michael stating that 'Anthropic's greatest concerns are 'large-scale domestic surveillance' and 'fully autonomous weapons systems' within the United States.'

Subsequently, on January 14, 2026, Michael sent a message saying, 'It's been about three weeks since our last contact. I'd like a general overview of any changes in Anthropic's position.' At this point, it's clear that Michael was expecting a change in Anthropic's stance.

However, the following day, January 15, 2026, Dalio reiterated his insistence on restricting use that could lead to domestic surveillance, demonstrating that Anthropic's stance had not changed.

Michael's email dated February 4, 2026, states, 'Anthropic's attempts to distinguish how its technology will be used are futile,' 'In our world, there is no distinction between defensive and offensive weapons,' and 'Anthropic has one last chance to agree,' clearly indicating a strong demand for CEO Amodi to lift the restrictions.

Subsequently, CEO Amodi maintained his stance on 'large-scale domestic surveillance' and restrictions on 'fully autonomous weapons,' ultimately leading to the severance of relations on February 28, 2026.
Regarding Anthropic and the US government, on June 13, 2026 (Japan time), the services for Claude Mythos 5 and Claude Fable 5 were suspended due to 'directives from the US government's national security authorities.' However, following the lifting of restrictions by the Department of Commerce, the services resumed on July 1, 2026 (local time).
US government lifts restrictions on Claude Fable 5 and Claude Mythos 5 - GIGAZINE

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