EventPolicyJune 13, 2026

US government orders suspension of Anthropic's Fable 5 and Mythos 5

The US government issued an export control directive requiring Anthropic to immediately disable Fable 5 and Mythos 5 for all customers, citing a national security concern over a jailbreak method. Anthropic stated the vulnerabilities are minor and also discoverable by other models without any bypass.

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US government orders suspension of Anthropic's Fable 5 and Mythos 5 — AIBriefs