> ## Documentation Index
> Fetch the complete documentation index at: https://www.vibecodeapp.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Claude Fable 5.1

> Anthropic's most capable model

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.

## Best For

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

## Features

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

## 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.

## Choose This If

Choose Claude Fable 5.1 when quality matters more than cost. For most tasks, [Claude Opus 5.5](/docs/integrations/claude-opus-5-5) or [Claude Sonnet 5.5](/docs/integrations/claude-sonnet-5-5) is faster and cheaper.

<CardGroup cols={2}>
  <Card title="Browse All Integrations" icon="grid-2" href="/docs/integrations/index">
    See the full integrations catalog
  </Card>

  <Card title="Claude Opus 5.5" icon="message-bot" href="/docs/integrations/claude-opus-5-5">
    Lower-cost alternative
  </Card>
</CardGroup>


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