The U.S. government has imposed export controls on Anthropic's Fable and Mythos AI models after a security jailbreak was discovered, effectively creating a secret licensing regime for frontier AI that lacks transparency and clear rules.

What happened: The U.S. government decided to impose export controls on Anthropic's Fable and Mythos models after researchers at Amazon found a way to jailbreak some of Fable's cybersecurity guardrails. Anthropic was forced to disable both models for all users because American "deemed export" rules mean that allowing any foreign national—including those who work for Anthropic—to access the models would violate the law. Anthropic sent high-level executives to Washington to seek a compromise, but no deal has been reached so far.

Why it matters: The decision reveals that the U.S. government now operates a mandatory licensing regime for frontier AI, but one that is ad hoc, opaque, and lacks transparency. Policy experts note that requirements change constantly and are kept secret, even from the administration itself, which discovers the rules as it reacts to events. This arbitrary approach contrasts sharply with the statutory process that industry advocates—including Anthropic's own CEO Dario Amodei—have called for. The situation may discourage private development of frontier AI in the United States unless companies substantially limit their models' coding and biological knowledge.

What to watch: More than 100 cyber and tech policy experts signed an open letter stating that Fable and Mythos were essential tools for cyber defenders, and that the benefits to security outweighed the risks of jailbreaking—noting that other AI models like OpenAI's GPT-5.5 possess similar cybersecurity risks but are not subject to export controls. Amazon, which has invested $13 billion（約2.1兆円） into Anthropic and committed to investing up to $20 billion（約3.2兆円） more in the coming years, made the initial report of the jailbreak; details about Amazon's internal reasoning and CEO Andy Jassy's communications with the White House remain unclear.