Anthropic releases Claude Fable 5.2; Claude Mythos 5.2 available to vetted orgs
Anthropic announced two new models, Claude Fable 5.2 and Claude Mythos 5.2, claiming improvements in coding, reasoning, and vision and faster output than the 5.1 versions. Anthropic says Fable 5.2 is broadly available today while Mythos 5.2 access is limited to vetted organizations, and that prerelease testing helped solve complex engineering and scientific tasks (including work on black hole physics and formalizing Fermat’s Last Theorem).