The US government has ordered Anthropic to suspend access to Claude Fable 5 and Claude Mythos 5 for any foreign national, even those living inside the United States and even foreign employees of Anthropic itself. These were among the most powerful AI models ever shown to the public. Anthropic's response was to remove both models automatically for all users. The move is highly unusual, and in the public history of commercial AI releases, nearly without precedent. Fable 5 had just been released as Anthropic's most powerful widely available model, with safeguards around cybersecurity, biology, chemistry, and model distillation. Mythos 5 used the same underlying system with some safeguards lifted for trusted cyberdefenders.

The order exposes a strategic contradiction. Washington appears to be trying to keep the most capable American systems away from adversaries, yet the immediate effect is to remove an American model from the market. Anthropic says the government cited a possible way to bypass Fable's safety protections, but the company argues the example was of lesser importance, involved minor known vulnerabilities, and showed capabilities already available in other public models. AI is advancing at an exponential and vertiginous pace, which raises the chance that other countries may soon reveal models stronger than anything they have shown publicly so far, including Chinese systems developed outside American controls. If that happens while US models remain trapped behind emergency restrictions, the advantage shifts from technical superiority to commercial availability. Measures like this could even push frontier AI companies to ask whether remaining inside the United States has become a strategic liability. In AI, power belongs partly to whoever builds the strongest model, and partly to whoever can keep it usable.