Government / United States

Cybersecurity and Infrastructure Security Agency

CISA's exclusion from Mythos is the starkest access gap in the dataset: the agency legally responsible for defending infrastructure Mythos could target has no access to the model.

critical infrastructure defensesector coordinationvulnerability disclosure

Entity log

Apr 21, 2026

High impactBlocked

Axios: CISA lacks access to Mythos despite being the nation's top cyber defense agency

Axios reported that CISA does not have access to Claude Mythos Preview, even as other government agencies including the NSA are reportedly using it. Anthropic briefed CISA on Mythos capabilities but this did not result in access; the Commerce Department's Center for AI Standards and Innovation was separately reported to be testing the model.