Anthropic Fable 5 and Mythos 5 Access Blocked to All Users Following Government Directive

Anthropic disabled access to its top AI models, Fable 5 and Mythos 5, worldwide after a U.S. government directive ordered blocking foreign-national access due to concerns about a potential jailbreak technique; Anthropic says the demonstrated method surfaced only a few known minor vulnerabilities, that other public models can produce similar outputs, and has applied temporary mitigations while investigating further.