The US government has lifted its block on Anthropic's powerful Claude Mythos 5 AI model, allowing the company to release it to over 100 US institutions, including major companies and government agencies. The decision comes after two weeks of intense talks between the government and Anthropic, during which the company committed to work with the US government on protocols and standards for its models. The move marks the beginning of a new regulatory regime that gives the US government control over the release of frontier AI models. The framework for overseeing AI is being built on the fly, with many users remaining in the dark about when they will get access to Mythos and similar models.