Claude Mythos 5.1
Mythos 5.1 takes the trusted-access route, aimed at biological and cyber security work. Same base as Fable 5.1, stricter guardrails: who gets access and how it may be used is the story.
Mythos 5.1 shares a base with Fable 5.1 but takes the trusted-access route instead of opening to everyone. Its strengths sit in the two high-risk areas of biological and cyber security, and guardrails sit above the general release: access depends on screening and stated use, not on subscription tier. For most teams the real question is not how strong the model is, but whether they qualify and which audit steps follow once access is granted.
