Claude Fable 5.1 Remains Latest Publicly Listed Fable Model

A post circulating on X claimed that an unverified reference to Claude Fable 5.5 appeared in Azure-related configuration files, but no primary material confirms the model or its release plans. No screenshot, filing or official documentation supports the alleged configuration entry. The latest publicly listed Fable model is Claude Fable 5.1, while Claude 5.5 announcements so far cover Opus, Sonnet and Haiku. Claude Fable 5.1 and Claude Mythos 5.1 were introduced in September 2026. Fable 5.1 became generally available, while Mythos 5.1 was limited to trusted-access programs. Fable 5.1 is available through Amazon Web Services, Google Cloud and Microsoft Azure.

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