US export-control directive forces Anthropic to disable Claude Fable 5 and Mythos 5 for everyone
Late Friday, Anthropic said the US government issued an export control directive suspending all access to Fable 5 and Mythos 5 by any foreign national, inside or outside the US, including its own foreign-national employees.
Because there is no practical way to segregate those users, Anthropic disabled both models for all customers, three days after launch. Anthropic said it had been given only verbal evidence of a potential narrow, non-universal jailbreak — essentially asking the model to read a codebase and fix flaws — and argued that the capability is already widely available from other models, naming OpenAI's GPT-5.5. NBC reported the directive letter came from Commerce Secretary Howard Lutnick with the Bureau of Industry and Security.

WHY IT MATTERS
The clearest signal yet that frontier model releases are now gated by state export-control machinery, not just lab judgment — and a live case study in what safeguards mean when the government disagrees with your risk assessment.
