U.S. Orders Anthropic to Suspend Foreign-National Access to Fable 5 and Mythos 5

Summary

Anthropic says a U.S. order requires it to suspend foreign nationals’ access to Fable 5 and Mythos 5 over national security concerns. The company disputes the rationale, citing its safeguards and the limited scope of the alleged jailbreak.

Key points

Anthropic says it received an order to suspend foreign nationals’ access to Fable 5 and Mythos 5, including users outside the U.S.; access to its other models is unaffected.
Anthropic says the directive may stem from a narrow jailbreak demonstration involving the models’ ability to find previously known, minor software vulnerabilities.
The company says its safety classifiers are designed to block harmful requests involving cyberattack planning, exploit development, and defense evasion.
Anthropic says Mythos-class models can turn newly disclosed vulnerabilities into working exploits in hours or minutes, while Mythos 5 remains available to vetted cyber defenders and critical infrastructure operators.
Anthropic disputes the need to suspend the models and says it is seeking to restore access.

Article Details

Event Type: U.S. government order restricting foreign nationals’ access to Anthropic’s Claude Fable 5 and Mythos 5 over national security concerns.
Impact: Anthropic said it would disable the models for all users, although the order applies to foreign nationals. Anthropic said the directive may be based on a misunderstanding and that it is working to restore access. The company says Mythos 5 remains available to a vetted group of cyber defenders and critical infrastructure operators.