› Updated: 9 November 2026Claude Mythos 5.2 is the version of Anthropic's newest model that most people will never use directly.
› Released on 9 November 2026 together with Claude Fable 5.2, it is the same underlying model, but without the extra classifiers that make Fable refuse high-risk cybersecurity and biology work.
› Access is limited to vetted security teams and life-science researchers.
› Here is what Mythos 5.2 is, who can get it, what it costs and what Anthropic says it can do, based on the announcement and the documentation from launch day.What Claude Mythos 5.2 isAnthropic released one model in two configurations.