Anthropic: Suspends All Access to Fable 5 and Mythos 5 Due to U.S. Government National Security Directive

Odaily reported that the U.S. government has issued an export control directive citing national security authority, requiring the suspension of all access for foreign nationals to Fable 5 and Mythos 5, including Anthropic’s foreign national employees. To ensure compliance, Anthropic must close all customer access to Fable 5 and Mythos 5, while all other Anthropic models remain unaffected.

The U.S. government provided oral evidence indicating a potential narrow-scope, non-general jailbreak method for the model. Anthropic is complying with the government's legal directive and removing all user access to Fable 5 and Mythos 5, but disagrees with the decision to withdraw deployed commercial models based on the discovery of a narrow-scope potential jailbreak, and is working diligently to restore access as soon as possible.