Claude Fable 5.1: Anthropic Reportedly Finishes Training Successor to Suspended Mythos 5 Model

Anthropic has reportedly finished training Claude Fable 5.1, the successor to the suspended Mythos 5 model, but the model is not yet released. OutYet.ai tracks release dates and shows an average guess of August 1, 2026, based on one user prediction.

OutYet.ai / Anthropic /providers/anthropic Claude Fable 5.1 Is Claude Fable 5.1 out yet? No. When is Claude Fable 5.1 coming out? Claude Fable 5.1 is not out yet. Readers guessing here settle on an average of Aug 1, 2026, drawn from 1 guess. OutYet.ai rechecks Anthropic's official release surfaces every minute and flips this page the moment access goes live. Last checked Jul 1, 2026. Last checked just now Wisdom of the crowd August 1, 2026 1 guess Benchmarks No benchmark scores published yet. Vibe Rating Community sentiment — how the user base feels about this model. Not a sourced benchmark. No Vibe Ratings yet — be the first to rate this model. Vibe Ratings open once this model is released — rate it after you’ve tried it. For now, you can guess its release date above. Community Consensus AI-generated from public community feedback — not a sourced fact. Not enough public feedback yet to summarize. Add a comment or a Vibe Rating to help build the community consensus.