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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.

read1 min views11 publishedJun 23, 2026
Claude Fable 5.1: Anthropic Reportedly Finishes Training Successor to Suspended Mythos 5 Model
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[Anthropic](/providers/anthropic)Claude Fable 5.1

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.

source & further reading
outyet.ai — original article Leanstral 1.5: ICYMI: Mistral released Leanstral 1.5, a SOTA open model for Lean 4 proof engineering. > Developers use Lean 4 as a general-purpose functional language (for CLI tools and libraries)… Muse Spark: Meta is still training their big models but we will get an update on Muse Spark soon https://t.co/M62UrzO40q Llama 5: Meta's next frontier model 'Watermelon' reportedly caught GPT-5.5 on internal benchmarks (still training)
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