The U.S. government is allowing Anthropic to deploy its Mythos 5 model to a select group of customers and partners, according to a letter from Commerce Secretary Howard Lutnick to Anthropic. Lutnick wrote that the government was confident in the guardrails Anthropic had put in place. Mythos 5 access will be restored to around 100 organizations that include government agencies and private companies, according to people familiar with the matter, who said the restoration will help ensure the organizations can use the model for defensive cyber purposes. “Today, the government notified us that Mythos 5, our strongest cybersecurity model, can be redeployed to a set of US organizations that operate and defend critical infrastructure,” Anthropic wrote on X. A source close to the company said Anthropic will continue discussions with the government over the weekend as it seeks to restore access to Fable 5. Two weeks ago, Lutnick invoked export control authorities to require Anthropic to shut off access to Mythos 5 and Fable 5, citing threats to national security. Lutnick’s Friday move comes hours after Anthropic competitor OpenAI announced it would release its GPT-5.6 family in phases per the federal government’s request. Before it was pulled back, Mythos 5 had been available to a subset of trusted organizations involved in Anthropic’s Project Glasswing.