The US government issued an export control directive on June 12, 2026, ordering Anthropic to suspend all access to its Fable 5 and Mythos 5 models for any foreign national, forcing Anthropic to disable the models entirely for all customers to ensure compliance. The government's concern centers on a reported jailbreak technique, which Anthropic says amounts to asking the model to read a codebase and fix software flaws — a capability Anthropic argues is already widely available in models like OpenAI's GPT-5.5. Anthropic disputes the action, stating no universal jailbreak has been found and that their defense-in-depth strategy makes Fable 5's risks comparable to other deployed industry models. The order sets a significant precedent that could, by Anthropic's own assessment, halt all new frontier model deployments if applied uniformly across the industry.