Anthropic Suspends Fable 5 and Mythos 5 Models Due to National Security Ban, AI Open-Source Wave and Geopolitical Controversy Arise

The U.S. government has issued a restriction order against AI company Anthropic on national security grounds, leading to the suspension of access to its flagship models Fable 5 and Mythos 5. This decision has sparked widespread discussion in the tech community, covering multiple issues such as AI security vulnerabilities, export controls, and the rise of open-source alternatives.

Anthropic AI Safety 国家安全
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US Government Emergency Order Forces Anthropic to Shut Down Fable 5 and Mythos 5: Security Restrictions and Model Openness Conflict Intensifies

On June 12, 2026, the US Department of Commerce issued an emergency export control order requiring Anthropic to globally shut down access to Claude Fable 5 and Mythos 5, citing national security concerns over a discovered bypass of safety measures. Anthropic complied but disputed the severity, noting the vulnerabilities were minor and reproducible via public models like GPT-5.5.

AI Regulation Anthropic 模型安全
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