# Claude Fable 5.1

Claude Fable 5.1 improves on Fable 5 across long-running agentic coding, knowledge work, and research, following instructions precisely over sessions that run unattended for hours.

- **Model ID:** `anthropic/claude-fable-5.1`
- **Type:** chat
- **Providers:** anthropic
- **Context window:** 1,000,000
- **Maximum output tokens:** 128,000
- **Pricing:** $10/1M input tokens, $50/1M output tokens
- **Canonical page:** https://vercel.com/ai-gateway/models/claude-fable-5.1

## Supported parameters

Detailed capability metadata has not been reported for this model.

## Example

```ts
import { streamText } from 'ai'

const result = streamText({
  model: 'anthropic/claude-fable-5.1',
  prompt: 'Why is the sky blue?'
})
```

## Links

- [Model page](https://vercel.com/ai-gateway/models/claude-fable-5.1)
- [AI Gateway documentation](https://vercel.com/docs/ai-gateway)
- [Provider model documentation](https://www.anthropic.com/news/)