Anthropic disables Fable 5 and Mythos 5 worldwide under an unprecedented US export-control directive
After a June 12 letter from Commerce Secretary Howard Lutnick citing national-security authorities, Anthropic shut off access to its two most advanced models for any foreign national, including its own employees. The order — the first use of the export-control tool against a commercially deployed language model — followed a reported vulnerability concern days after Fable 5's launch. Anthropic disputed the severity and warned the standard could 'halt all new model deployments' if applied broadly.
The landmark issue is the state's power to switch off a live frontier model worldwide, not whether this one jailbreak is serious.
Bloomberg and TheNextWeb reported that whether the cited flaw is grave or trivial, the government's demonstrated authority to disable a deployed frontier model for all foreign users — the first time export-control tools built for chips and military tech have been turned on a commercial LLM — is the precedent that matters most for the AI industry.
National security first: the government acted to close a vulnerability in a dual-use frontier model adept at finding software flaws.
Coverage sympathetic to the order emphasized legitimate state authority to restrict foreign access to the most capable AI when a security concern is raised, noting the Mythos-class models were unusually effective at identifying software vulnerabilities and could be misused as a cyberweapon.
Anthropic says the jailbreak was narrow and the surfaced flaws minor and public, but it is complying under protest.
In its own statement, Anthropic said it received only verbal evidence of a narrow, non-universal jailbreak and that the surfaced vulnerabilities were minor and already publicly known, adding that it is complying with the directive while disputing the severity and warning the precedent could halt frontier-model deployments across the industry.