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Anthropic suspends Fable 5 and Mythos 5 due to US government directive

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Anthropic is suspending access to its Fable 5 and Mythos 5 models for all customers in response to a US government export control directive. The government cited national security concerns, believing a method to bypass the model's safeguards has been discovered. This action affects all users, including foreign national Anthropic employees, though other Anthropic models remain unaffected. Anthropic disagrees with the severity of the finding and is working to restore access.

  • →Fable 5 and Mythos 5 access suspended globally
  • →Government directive based on potential jailbreak finding
  • →Anthropic defends Fable 5's safeguards and strategy
Breaking changes (1) ›
  • Fable 5 and Mythos 5 access suspended globally

    Anthropic must suspend all access to Fable 5 and Mythos 5 for all customers due to a US government export control directive citing national security concerns. This directive applies to all foreign nationals, including Anthropic employees.

Notes (2) ›
  • Government directive based on potential jailbreak finding

    The US government believes a method to bypass Fable 5's safeguards has been discovered. Anthropic's review indicated the identified vulnerabilities are minor and widely available in other models.

  • Anthropic defends Fable 5's safeguards and strategy

    Anthropic maintains Fable 5 has strong safeguards and employed a defense-in-depth strategy. They argue that even narrow jailbreaks do not warrant recalling a model deployed to hundreds of millions of users.

Read the original announcement →

https://www.anthropic.com/news/fable-mythos-access

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