tl;dr: Anthropic is complying with a US government export control directive to suspend access to Fable 5 and Mythos 5 for all customers, citing national security concerns over an alleged jailbreak. Anthropic disputes the basis for the order, arguing the demonstrated jailbreak is narrow, reveals only minor vulnerabilities already discoverable by other public models like GPT-5.5, and doesn't justify recalling a widely deployed model. The company says the action violates principles of a transparent, technically-grounded regulatory process and is working to restore access.