# Claude Sonnet 5.5

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

Claude Sonnet 5.5 is an everyday model from Anthropic, released 28 September 2026. At Anthropic it costs $2.00 per million input tokens and $10.00 per million output tokens, with a 1M-token context window.

- Made by: Anthropic
- Released: 2026-09-28
- Status: Generally available, new
- Tier: Everyday
- Weights: Closed
- Context window: 1,000,000 tokens
- Max output: 128,000 tokens
- Input: text, image, pdf
- API id: claude-sonnet-5-5
- Docs: https://platform.claude.com/docs/en/models/overview

## Claude Sonnet 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 | $2.00 | $10.00 | $0.10 | $4.00 | 50% off | [2026-10-15](https://platform.claude.com/docs/en/about-claude/pricing) |

- Anthropic: Cache reads cut from $0.20 to $0.10 (0.05x input) on 2026-10-07. 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.

## Claude Sonnet 5.5 benchmarks

| Benchmark | Score | What it measures | Reported by |
|---|---|---|---|
| LMArena text score | 1471 | 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 Sonnet 5.5

| Model | Input | Output | Context | Weights |
|---|---|---|---|---|
| Claude Sonnet 5.5 | $2.00 | $10.00 | 1M | Closed |
| [GPT-6.1 Sol](https://dbggr.dev/models/gpt-6-1-sol/) | $2.00 | $10.00 | 1.1M | Closed |
| [Command A+](https://dbggr.dev/models/command-a/) | $2.50 | $10.00 | 128K | Open |
| [Gemini 3.1 Pro](https://dbggr.dev/models/gemini-3-1-pro/) | $2.00 | $12.00 | 1M | Closed |
| [Qwen3.8 Max](https://dbggr.dev/models/qwen3-8-max/) | $2.00 | $6.00 | 1M | Open |
| [Mistral Medium 3.5](https://dbggr.dev/models/mistral-medium-3-5/) | $1.50 | $7.50 | 256K | Open |

## FAQ

### How much does Claude Sonnet 5.5 cost?

Claude Sonnet 5.5 costs $2.00 per million input tokens and $10.00 per million output tokens at Anthropic, and $0.10 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 Sonnet 5.5's context window?

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

### Is Claude Sonnet 5.5 open weight?

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

### Where can I use Claude Sonnet 5.5?

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