Statement on the US government directive to suspend access to Fable 5 and Mythos 5
The US government suspended Fable 5 and Mythos 5 globally via an export control directive citing national security.
Anthropic launched Fable 5 three days earlier on June 9, positioning it as the first Mythos-class model for general use. On June 12, the US government issued an export control directive — the first known such action targeting a deployed commercial AI model — requiring Anthropic to suspend Fable 5 and Mythos 5 for all foreign nationals, including Anthropic employees, anywhere in the world. Anthropic received the directive at 5:21pm ET with no specific technical disclosure. Access to all other Anthropic models — Opus 4.8, Sonnet, and Haiku — is unaffected. Anthropic disputes the finding, characterizing the claimed jailbreak as narrow and non-universal, and notes GPT-5.5 replicates the same capability without bypass. This is the first instance of a US government agency using national security authorities to remove a commercial frontier AI model from global deployment.