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Anthropic Blocks Fable 5 and Mythos 5 Access for Foreign Nations

The Verge AI · Jun 15, 2026 · 1 min read · Read original article →

Anthropic has blocked access to its Fable 5 and Mythos 5 models for all foreign nations due to national security concerns. The company claims the government did not provide specific details of the concern and that the vulnerabilities discovered were minor and available via other models. Anthropic is working with governments and changing its data retention policy to track potential malicious uses.

💡 Key Takeaways

  1. Anthropic blocked access to Fable 5 and Mythos 5 models for all foreign nations due to national security concerns.
  2. The company claims the government did not provide specific details of the concern and that the vulnerabilities discovered were minor and available via other models.
  3. Anthropic is working with governments and changing its data retention policy to track potential malicious uses.
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