Anthropic shuts down Fable, Mythos models following Trump admin directive

Anthropic disabled access to Mythos 5 and Fable 5 just days after launch, following a US Commerce Department directive subjecting the models to export controls. The administration cited concerns over a jailbreak that could bypass safeguards for cybersecurity, chemistry, and biology. Anthropic says evidence shows only minor software vulnerabilities, comparable to GPT-5.5.