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Claude Fable 5.1 is Anthropic’s most capable model, built for the hardest reasoning and long-running agentic work. Thinking is always on, it takes a 1M-token context, and it accepts text, images, and PDFs.

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Best For

  • Complex coding assistants
  • Research tools
  • Multi-step agents
  • Tasks where quality matters more than cost

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Features

  • Strongest Claude reasoning
  • Always-on thinking
  • 1M-token context
  • Text, image, and PDF input

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Ask Vibecode

Tell the AI:
“Add Claude Fable 5.1 to my app for the most capable reasoning.”
The AI will set up the integration automatically.

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Choose This If

Choose Claude Fable 5.1 when quality matters more than cost. For most tasks, Claude Opus 5.5 or Claude Sonnet 5.5 is faster and cheaper.

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Claude Opus 5.5

Lower-cost alternative