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

12 June 2026·1 min read
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Source: Anthropic

What was announced

Anthropic has been ordered by the US government to suspend access to Fable 5 and Mythos 5 for all foreign nationals, including foreign employees of Anthropic. This directive was issued due to concerns about potential vulnerabilities in these models, specifically a method of 'jailbreaking' them.

Why it matters

Developers using Fable 5 and Mythos 5 will lose access to these models immediately. This affects developers who rely on these models for specific tasks. The directive does not impact access to other Anthropic models. Developers should review their workflows and consider alternatives or backups for their projects.

Key takeaways

  • Access to Fable 5 and Mythos 5 is suspended for all foreign nationals.
  • Developers should review their project dependencies and consider alternative models or services.
  • Anthropic will continue to support other models and will provide updates on the situation.
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