FORTUNATELY THIS WAS ONLY A TEST OF THE COMPANY’S WEAPONS-GRADE LLM: Anthropic’s Mythos AI Cracked ‘Almost All’ US Classified Systems in Hours, NSA Chief Reportedly Said.

Anthropic’s most powerful artificial intelligence model reportedly breached ‘almost all’ US classified systems in a matter of hours, according to Senator Mark Warner, who says the head of the National Security Agency told him directly that the model had penetrated nearly every classified system it was tested against. The claim has not been publicly confirmed by any government agency.

Senator Mark Warner, vice-chair of the Senate Intelligence Committee, said on 11 June that General Joshua Rudd, who leads both the NSA and the Pentagon’s Cyber Command, told him directly that Anthropic’s Mythos model ‘broke into almost all of our classified systems, not in weeks, but in hours.’ The extent of the alleged breach and which specific systems were affected have not been publicly disclosed. Anthropic did not respond to a request for comment.

The warning emerged alongside an abrupt move by the Trump administration to block foreign access to Anthropic’s two most advanced models, Mythos and Fable.

Previously: Why Did the Smartest AI in the World Just Go Dark?