Anthropic
Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and...
45.8
Quality Score
1307
Arena ELO
Undisclosed
Parameters
1M
Context
Use this section to answer one simple question first: how much outside evidence do we have that this model performs well? Structured benchmark scores appear first, then official provider evidence, then live arena signal.
This model has live arena signal, but it does not have structured benchmark rows or provider benchmark evidence yet.
A full normalized benchmark row is not available for this model yet.
Live arena evidence is already available below, so there is still a competitive signal even without a full benchmark table yet.
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Jun 2026
Released
1307
ELO Score
1292 - 1322
95% Confidence
+/-15 points
1.8K
Battles
Jun 23, 2026
Last Updated