US orders Anthropic to shut off its most powerful AI models

The U.S. government on Friday ordered Anthropic to immediately shut off access to two of its most powerful AI models — Claude Fable 5 and Claude Mythos 5 — citing national security concerns. Anthropic announced it complied but said it disagrees with the action.

The directive forced the company to disable both models for all users worldwide; access to Anthropic’s other models is not affected. Mythos is Anthropic’s most capable model and was kept tightly restricted because of its exceptional ability to find security vulnerabilities.

Anthropic says Mythos identified flaws in every major operating system and web browser it tested, so instead of a broad release the company launched Project Glasswing, sharing the model with roughly 50 vetted organizations, including Amazon, Apple, Google, Microsoft, and CrowdStrike, for defensive cybersecurity work.

United States

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