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Anthropic blocks all customers' access to Fable 5 and Mythos 5
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Anthropic blocks all customers' access to Fable 5 and Mythos 5

Engadget · Jun 13, 2026, 4:21 AM · Also reported by 4 other sources

Key takeaways

  • It's to ensure compliance with a government directive citing national security concerns.
  • Santiago/Getty Images Anthroic has disabled all of its customers' access to Fable 5 and Mythos 5 in order to ensure compliance with an order it received from the government on Friday, June 12.
  • While the US government didn't specify those concerns, Anthropic believes that it's because the government heard about a method of jailbreaking Fable 5.

It's to ensure compliance with a government directive citing national security concerns.

Michael M. Santiago/Getty Images Anthroic has disabled all of its customers' access to Fable 5 and Mythos 5 in order to ensure compliance with an order it received from the government on Friday, June 12. All its other models and its Claude chatbot are not affected. The company said in its announcement that the US government wanted it to suspend all foreign nationals' access to its newly launched AI models, whether they're inside or outside the US and even if they're Anthropic employees, citing national security concerns.

While the US government didn't specify those concerns, Anthropic believes that it's because the government heard about a method of jailbreaking Fable 5. The company has just launched the Fable AI model, which was designed to bring many of Mythos' capabilities to the public, on June 9. If you'll recall, Mythos is its state-of-the-art cybersecurity model that's only available to its Project Glasswing partners. Fable's capabilities "exceed" any previous model Anthropic has launched. It beat Pokémon FireRed during the company's tests, for instance, while Claude failed to beat Pokémon Red, the original game it was based on.

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