NSA Loses Access to Anthropic Mythos AI Model Amid Trump Administration Dispute

Parts of the NSA lost access to Anthropic's Mythos 5 model this month after the Trump administration imposed export-control restrictions on the company, the New York Times reported, with the cutoff hitting analysts who had been using Mythos to find software weaknesses in government networks 123. Nextgov/FCW reported the access loss traces to Project Glasswing, the restricted program through which NSA red teams held authorization to use the model, and that some analysts were told Friday that access would end, though earlier versions may remain available under prior arrangements 3. Sen. Mark Warner said at a June 11 hearing that NSA Director Gen. Joshua Rudd told him Mythos "broke into almost all of our classified systems, not in weeks, but in hours"; officials later told the Times and the Associated Press the statement referred to a controlled red-team test inside classified systems isolated from the wider internet, not an external breach 3. Anthropic said it received a government directive on June 13 ordering it to suspend Fable 5 and Mythos 5 access for any foreign national, including noncitizen employees in the US, and disabled the models for all customers because it could not comply selectively 3.