The US government has given Anthropic the green light to bring back its powerful Claude Mythos 5 AI model, which can be used by organizations to protect critical infrastructure. This move is likely similar to the approval granted to OpenAI for its GPT-5.6 Sol model. Anthropic is now working with the government to expand access to Mythos 5 and make another model, Fable 5, available again. The company had been working to restore access to these models since June 12, after they were blocked by government orders. Why it matters: this approval signals a significant shift in the US government’s approach to AI regulation, potentially paving the way for more widespread adoption of advanced AI models in critical infrastructure protection.