Statement on the US government directive to suspend access to Fable 5 and Mythos 5

Anthropic News / 6/13/2026

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Key Points

The US government issued an export-control directive requiring Anthropic to suspend all access to its Fable 5 and Mythos 5 models by any foreign national, including Anthropic employees, effective immediately for compliance.
As a result, Anthropic will abruptly disable Fable 5 and Mythos 5 for all customers, while access to other Anthropic models will remain unaffected.
The government letter cited national security concerns but did not provide specifics; Anthropic believes it relates to a method for bypassing (“jailbreaking”) Fable 5 and exploiting minor vulnerabilities identified via a demonstration.
Anthropic says it previously implemented strong, heavily red-teamed safeguards for Fable, working with US/UK and multiple third parties, and that the safeguards were found to be substantially more effective than prior models.
Anthropic notes that, as of the time of writing, no testers have found a universal jailbreak capable of broadly bypassing the safeguards, though the government appears to have identified a specific bypass approach tied to limited issues.

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