Anthropic Mythos Found Cracks in the Government’s Most Guarded Systems

Anthropic’s Mythos synthetic intelligence (AI) mannequin reportedly wanted solely hours to search out sure safety vulnerabilities in extremely delicate US authorities pc programs throughout an intelligence take a look at, a US official informed the Associated Press.

Still, that velocity doesn’t imply it may exploit them in the similar window, the official stated, talking anonymously to debate the delicate matter.

Anthropic Mythos Mapped the Weak Spots in Secure Government Systems

The official stated the testing was performed below Project Glasswing. Anthropic opted in opposition to a public launch for Mythos. 

Instead, it granted a choose group of greater than 50 expertise companies early entry to the unreleased mannequin, permitting them to establish and remediate important software program vulnerabilities.

Senator Mark Warner of Virginia referenced the checks on June 11. He spoke earlier than the Senate Committee on Banking, Housing, and Urban Affairs. 

“This device broke into virtually all of our categorized programs, not in weeks however in hours,” he said.

Warner attributed the account to the head of the National Security Agency (NSA) and US Cyber Command, Gen. Joshua Rudd.

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Mythos already carries a monitor document of discovering flaws. The UK’s AISI (AI Security Institute) tested Mythos Preview on expert-level capture-the-flag challenges. The mannequin succeeded 73% of them. No mannequin had cleared that bar earlier than April 2025.

In April, Mozilla credited the AI model with surfacing 271 vulnerabilities in Firefox. The browser maker patched them in Firefox 150.

Anthropic then launched Claude Fable 5 in early June. It billed the mannequin as a common launch model of its Mythos tier, with added safeguards.

The opening was temporary. On June 12, the US authorities issued an export control directive citing nationwide safety. The order required the agency to bar each overseas nationwide from Fable 5 and Mythos 5.

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