# Claude Opus 5.5 (Fast)

Claude Opus 5.5 is a step-change improvement over Opus 5 for agentic coding, long-running agentic tasks, knowledge work, communication, and vision. It is more token-efficient per completed task and reports progress, findings, and next steps in clear language.

- **Model ID:** `anthropic/claude-opus-5.5-fast`
- **Type:** chat
- **Providers:** anthropic
- **Context window:** 1,000,000
- **Maximum output tokens:** 128,000
- **Pricing:** $8/1M input tokens, $40/1M output tokens
- **Canonical page:** https://vercel.com/ai-gateway/models/claude-opus-5.5-fast

## Supported parameters

Detailed capability metadata has not been reported for this model.

## Example

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

const result = streamText({
  model: 'anthropic/claude-opus-5.5-fast',
  prompt: 'Why is the sky blue?'
})
```

## Links

- [Model page](https://vercel.com/ai-gateway/models/claude-opus-5.5-fast)
- [AI Gateway documentation](https://vercel.com/docs/ai-gateway)
- [Provider model documentation](https://platform.claude.com/docs/en/about-claude/models/overview)
- [Provider pricing](https://www.anthropic.com/pricing#anthropic-api)