# Claude Opus 5.5

Model tracker · checked 2026-10-15 · https://dbggr.dev/models/claude-opus-5-5/

Claude Opus 5.5 is a frontier model from Anthropic, released 22 September 2026. At Anthropic it costs $4.00 per million input tokens and $20.00 per million output tokens, with a 1M-token context window.

- Made by: Anthropic
- Released: 2026-09-22
- Status: Generally available, new
- Tier: Frontier
- Weights: Closed
- Context window: 1,000,000 tokens
- Max output: 128,000 tokens
- Input: text, image, pdf
- API id: claude-opus-5-5
- Docs: https://platform.claude.com/docs/en/models/overview

## Claude Opus 5.5 price at Anthropic

US dollars per million tokens. Blended is 3 input tokens for every output token, one number to compare on.

| Provider | Input | Output | Cached input | Blended | Batch | Checked |
|---|---|---|---|---|---|---|
| Anthropic | $4.00 | $20.00 | $0.20 | $8.00 | 50% off | [2026-10-15](https://platform.claude.com/docs/en/about-claude/pricing) |

- Anthropic: Cache writes 1.25x (5 min) or 2x (1 h) input. US-only inference (inference_geo: us) costs 1.1x. Full 1M context at standard price. Fast mode (research preview): $8 / $40.

## Claude Opus 5.5 benchmarks

| Benchmark | Score | What it measures | Reported by |
|---|---|---|---|
| LMArena text score | 1504 | Elo-style score from people voting between answers | [Independent](https://arena.ai/leaderboard/text) |

Scores reported by a model's maker aren't independently checked.

## Models like Claude Opus 5.5

| Model | Input | Output | Context | Weights |
|---|---|---|---|---|
| Claude Opus 5.5 | $4.00 | $20.00 | 1M | Closed |
| [Muse Wonder](https://dbggr.dev/models/muse-wonder/) | $4.00 | $20.00 | 1M | Closed |
| [Gemini 4 Argon](https://dbggr.dev/models/gemini-4-argon/) | $2.00 | $10.00 | 1M | Closed |
| [Claude Fable 5.1](https://dbggr.dev/models/claude-fable-5-1/) | $10.00 | $50.00 | 1M | Closed |
| [GPT-6 Astra](https://dbggr.dev/models/gpt-6-astra/) | $10.00 | $50.00 | 1.1M | Closed |
| [Mistral Large 4](https://dbggr.dev/models/mistral-large-4/) | $0.68 | $2.09 | 1M | Open |

## FAQ

### How much does Claude Opus 5.5 cost?

Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens at Anthropic, and $0.20 per million cached input tokens, with 50% off for batch requests. Prices are list prices in US dollars, last checked 15 October 2026.

### What is Claude Opus 5.5's context window?

Claude Opus 5.5 takes up to 1,000,000 tokens in one request and writes up to 128,000 tokens in one response.

### Is Claude Opus 5.5 open weight?

No. Claude Opus 5.5 is only available through Anthropic's API; Anthropic doesn't publish the weights.

### Where can I use Claude Opus 5.5?

Claude Opus 5.5 is available from Anthropic. At Anthropic, call it as `claude-opus-5-5`.