Model tracker / Anthropic
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
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 · maker | $2.00 | $10.00 | $0.10 | $4.00 | 50% off | 2026-10-15 |
- 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 |
Scores reported by a model's maker aren't independently checked.
Models like Claude Sonnet 5.5
Other everyday models closest in price, at each maker's own price or the cheapest provider.
| Model | Input | Output | Context | Weights |
|---|---|---|---|---|
| Claude Sonnet 5.5 | $2.00 | $10.00 | 1M | Closed |
| GPT-6.1 Sol OpenAI | $2.00 | $10.00 | 1.1M | Closed |
| Command A+ Cohere | $2.50 | $10.00 | 128K | Open |
| Gemini 3.1 Pro Google | $2.00 | $12.00 | 1M | Closed |
| Qwen3.8 Max Alibaba | $2.00 | $6.00 | 1M | Open |
| Mistral Medium 3.5 Mistral AI | $1.50 | $7.50 | 256K | Open |
Compare them all in the model tracker →
Claude Sonnet 5.5 on dbggr
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- AI video generation compared: Veo, Wan, Seedance, Kling, Runway, HeyGen, Remotion and what a finished video costs (October 2026) Article, 2026-10-13
- Gemini 4 Argon is out for every developer at $2/$10, and doubles to Claude Opus 5.5's price on 1 December Daily, 2026-10-13
- Meta's Muse Wonder costs as much as Claude Opus 5.5: $4 in, $20 out per million tokens Daily, 2026-10-12
- How to write instructions for AI agents: what's tested and what's vibes Article, 2026-10-09
- Containing agents stopped being the labs' private problem Saturday edition, 2026-10-03
- OpenAI launches Dots, agents that keep working after you log off Daily, 2026-09-29
- Claude Sonnet 5.5 closes in on Opus at half the price Daily, 2026-09-28
Claude Sonnet 5.5 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.