PyyanThe AI Index

Pyyan / Language Models / Claude Fable 5.1

Claude Fable 5.1

Same price as Fable 5, and cache reads cost a quarter of what they did.

currentAnthropicVerified 2026-09-02

$10

per M input

Specifications

Context1Msource · as of 2026-09-02
Input ($/Mtok)$10source · as of 2026-09-02
Output ($/Mtok)$50source · as of 2026-09-02
LicenceProprietarysource · as of 2026-09-02
Max output128Ksource · as of 2026-09-02
ParametersNot publishedsource · as of 2026-09-02
Released1 Sep 2026source · as of 2026-09-02
Model IDclaude-fable-5-1source · as of 2026-09-02

Official links

Claude Fable 5.1 model page

What matters

  • Matches or beats Fable 5 at low and medium effort, and pulls clear at high effort
  • Cache reads cut to 25% of the old price, so re-reading a long context got much cheaper
  • Identical model to Mythos 5.1 underneath; the difference is the safeguards

Best for coding and long-running work.

Compare with

All 5 side by side →

Claude Fable 5.1 vs GPT-6 Astra →Claude Fable 5.1 vs Claude Fable 5 →Claude Fable 5.1 vs Claude Opus 5 →Claude Fable 5.1 vs GPT-5.6 Sol →Claude Fable 5.1 vs Gemini 3.1 Pro →

Also in Language Models

GPT-6 Astra · OpenAIClaude Fable 5 · AnthropicClaude Opus 5 · AnthropicGPT-5.6 Sol · OpenAIGemini 3.1 Pro · Google