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Claude Fable 5

Most capable widely released model, for the hardest reasoning and long-horizon agentic work.

currentAnthropic ↗Verified 2026-08-13

$10

per M input

Specifications

Context1Msource · as of 2026-08-13
Input ($/Mtok)$10source · as of 2026-08-13
Output ($/Mtok)$50source · as of 2026-08-13
LicenceProprietarysource · as of 2026-08-13
Max output128Ksource · as of 2026-08-13
Model IDclaude-fable-5source · as of 2026-08-13

Official links

Claude Fable 5 model pageAnthropic official site

What matters

  • Thinking is always on — the `thinking` param is rejected
  • Raw chain of thought is never returned
  • Requires 30-day data retention; unavailable under ZDR

Best for the hardest problems.

Compare with

All 5 side by side →

Claude Fable 5 vs Claude Opus 5 →Claude Fable 5 vs GPT-5.6 Sol →Claude Fable 5 vs Gemini 3.1 Pro →Claude Fable 5 vs Claude Sonnet 5 →Claude Fable 5 vs Grok 4.6 →

Also in Language Models

Claude Opus 5 · AnthropicGPT-5.6 Sol · OpenAIGemini 3.1 Pro · GoogleClaude Sonnet 5 · AnthropicGrok 4.6 · xAI