Svmuu 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.