The US government’s top cybersecurity agency is now running one of the most powerful AI models ever built against its own code. The Cybersecurity and Infrastructure Security Agency has obtained full access to Anthropic’s Mythos Preview model, putting machine learning to work on the decidedly unglamorous but critical task of finding security holes in government computer systems.
From excluded to all-access
When Anthropic first briefed the agency and the Commerce Department on the model’s capabilities back in April 2026, CISA was notably left out of the initial access cohort. That first group included roughly 50 organizations, and CISA wasn’t among them.
By mid-June 2026, CISA had secured full access to the model under Anthropic’s Project Glasswing initiative, a broader program designed to enhance code analysis across critical infrastructure and government sectors. Project Glasswing had just expanded in early June to approximately 150 additional partner organizations spanning more than 15 countries. CISA’s inclusion came shortly after that expansion.
What Mythos actually does
