AP Reports: Anthropic model ‘breaches’ US classified system in hour

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Anthropic logo is seen in this illustration taken June 11, 2026. REUTERS/Dado Ruvic/Illustration

Anthropic’s Mythos model identified vulnerabilities in highly ​sensitive U.S. government computer systems during a testing exercise, ‌the Associated Press reported on Tuesday.

Anthropic teamed up with Washington’s intelligence agencies to conduct tests using Mythos under Project Glasswing, the AP said, referring ​to a restricted programme designed to find and fix ​vulnerabilities in critical software before attackers could exploit them.

Senator ⁠Mark Warner of Virginia referred to the testing in a ​congressional hearing this month, saying he had been informed by National ​Security Agency chief Joshua Rudd that Mythos “broke into almost all of our classified systems, not in weeks, but in hours”.

Citing an unidentified U.S. official, ​the AP said that although Mythos identified certain vulnerabilities within ​hours, that did not mean the model was able to exploit them within that ‌time.

The ⁠White House, Anthropic and the Department of Defence did not immediately respond to Reuters’ requests for comment.

IPO-bound Anthropic’s relationship with the U.S. government has been rocky. The company refused to allow the U.S. ​military to use ​its AI models ⁠for domestic surveillance and fully autonomous weapons systems, and the government retaliated by putting it on ​a national security blacklist.

The U.S. government also this ​month ⁠ordered the company to suspend exports of its latest Mythos and Fable AI models to destinations worldwide and all foreign nationals, citing ⁠national ​security concerns.

The New York Times reported earlier ​in the day that the NSA lost access to Mythos amid the dispute.

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