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US Halts Anthropic's Claude Fable 5 and Mythos 5 Over Security
technical

US Halts Anthropic's Claude Fable 5 and Mythos 5 Over Security

US authorities have instructed Anthropic to shut off access to two of its AI models—Claude Fable 5 and Claude Mythos 5—citing national security issues. The directive, received Friday at 5:21 pm ET, mandates disabling both models globally for all users. This move targets the most capable publicly available AI model, Claude Mythos 5, which can identify software flaws in major operating systems and web browsers. Anthropic's Fable 5 was released just three days ago with added safeguards but still faces shutdown. The government’s action is framed as an export control measure, restricting foreign national access to these models despite no evidence of a universal jailbreak. This decision could set a precedent for future AI regulation.

Jun 13, 2026 · 3 min read
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