Anthropic’s Mythos Model Found Vulnerabilities in Classified US Government Systems, Official Says
Summary
Anthropic's Mythos AI model identified vulnerabilities in classified U.S. government computer systems within hours during a security testing initiative called Project Glasswing, according to a U.S. official. The testing was conducted in cooperation with U.S. intelligence agencies to assess potential security risks the model could pose. In response, the Trump administration issued a directive requiring Anthropic to prevent foreign nationals from accessing its latest models (Fable 5 and Mythos 5), and Anthropic disabled these models for all customers to comply.
Solution / Mitigation
Anthropic disabled the Mythos and Fable models for all of its customers to comply with the Trump administration's directive requiring the company to prevent foreign nationals from using its latest artificial intelligence models, known as Fable 5 and Mythos 5.
Classification
Affected Vendors
Related Issues
Original source: https://www.securityweek.com/anthropics-mythos-model-found-vulnerabilities-in-classified-us-government-systems-official-says/
First tracked: June 24, 2026 at 02:01 AM
Classified by LLM (prompt v3) · confidence: 92%