# Claude Opus 5.5

Anthropic's model for long-running agentic coding and knowledge work. Successor to Opus 5.

## Overview

- **Provider:** Anthropic
- **Model ID:** `claude-opus-5-5`
- **Type:** Chat
- **Canonical URL:** https://modelstack.cc/models/chat/claude-opus-5-5
- **Version:** Opus 5.5
- **Knowledge cutoff:** 2026-06
- **Best for:** Long-running agentic coding, knowledge work, complex multi-step tasks

## Pricing

| Usage | Price |
| --- | ---: |
| Input | $4 / 1M tokens |
| Output | $20 / 1M tokens |
| Cache read | $0.2 / 1M tokens |
| Cache write (5 minutes) | $5 / 1M tokens |
| Cache write (1 hour) | $8 / 1M tokens |

## Specifications

- **Context window:** 1M
- **Maximum output:** 128K
- **Typical latency:** 20 ms
- **Released:** 2026-09

## Capabilities

- chat
- tool_use
- reasoning
- vision
- coding
- analysis
- long_context

## API usage

Use this model ID in a ModelStack API request:

```json
{
  "model": "claude-opus-5-5"
}
```

For the rendered page, visit https://modelstack.cc/models/chat/claude-opus-5-5.