The US government lifted its block on Anthropic's Claude Mythos 5 AI model, announced in a letter sent to Anthropic two weeks after the government imposed export controls on the AI model. Commerce Secretary Howard Lutnick wrote to Anthropic’s chief compute officer Tom Brown on Friday, “I have determined that appropriate safeguards are in place to permit certain trusted partners to access the Claude Mythos 5 Model,” citing “significant progress” in the intense, daily talks between the government and the company since the block took effect. Anthropic said it was moving to restore access for approved providers, stating, “We are working to provision the approved set of providers and restore their access to Mythos 5 as quickly as possible. We are pleased to see this progress and continue to work with the government to expand access to Mythos 5 and make Fable 5 available for general use again.” The move came on the same day OpenAI released its latest model, GPT-5.6, to a short list of government-approved partners. The decision is being seen as a major de-escalation in the confrontation between the Trump administration and Anthropic concerning national security.