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Anthropic published a formal rebuttal to the June 12 U.S. export control directive suspending Fable 5 and Mythos 5, disclosing for the first time the specific jailbreak at issue (asking the model to read a codebase and fix software flaws) and the details of its defense-in-depth safety methodology. The statement is the clearest public account yet of how Anthropic characterizes its own safety assurances, and it reveals a meaningful gap between what vendors can promise and what government risk tolerance now requires.
On June 12, 2026, a U.S. government export control directive required Anthropic to suspend all access to Fable 5 and Mythos 5 for foreign nationals, effectively disabling the models for all customers overnight. The immediate trigger was a narrow code-analysis jailbreak technique, but the directive exposes deeper gaps: most enterprise AI governance programs have no continuity plan for government-mandated model suspension, no process for nationality-based access controls, and no export control review in their AI vendor assessment workflow.
