Anthropic: Claude Sonnet 5.5
Analysis Summary
Anthropic: Claude Sonnet 5.5 comes from Anthropic. Released in September 2026, it is one of the newest models we cover. We place it in the Frontier tier, where it sits at #2 of 688 models overall. For raw reasoning ability it ranks #2 of 431, putting it in among the very best models we track for overall intelligence.
Its 1M-token context window is larger than 86% of the models we list, suiting long documents, large codebases, and retrieval-heavy workloads. Crucially for business adoption, Anthropic: Claude Sonnet 5.5 combines tool use, function calling, vision input, and step-by-step reasoning in a single model, letting teams consolidate several use cases instead of stitching together multiple services.
At $2.00 input and $10.00 output per 1M tokens, Anthropic: Claude Sonnet 5.5 is mid-market priced. For organisations that want a no-compromise model for coding, analysis, and agentic automation, Anthropic: Claude Sonnet 5.5 is among the strongest choices available today.
The DFO score ranks models on the Artificial Analysis Intelligence Index and is refreshed as new models launch. The write-up and verdict are our own. Feedback?
DFO Verdict
Anthropic: Claude Sonnet 5.5 currently sits at #2 of 688 models on our board. We class it as a frontier-tier model.
Benchmarks
Artificial Analysis data refreshed Sep 30, 2026. Arena ratings from the Sep 25, 2026 text leaderboard, with style control.
Artificial Analysis has not published coding or agentic results for Anthropic: Claude Sonnet 5.5 yet. Until it does, the model sits below tested models on the Coding and AI Agents lists.
This model was released recently. Benchmark figures are preliminary and are likely to be updated as independent testing is finalised.
How Anthropic: Claude Sonnet 5.5 compares
Anthropic: Claude Sonnet 5.5 ranks #2 of 431 AI models we track for overall intelligence. Its 1M-token context window is larger than 86% of the models we list. At $2.00 per million input tokens it is cheaper than 17% of comparable models.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $2.00 | $0.002000 |
| Output | $10.00 | $0.010000 |
What would Anthropic: Claude Sonnet 5.5 cost your business?
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A website chatbot handling around 100 customer conversations a day, a few short messages each.
Full calculator with 688 models → Price Calculator
These numbers get smaller with the right architecture.
We route routine calls to cheap models and save Anthropic: Claude Sonnet 5.5 for the hard ones. Most clients cut their estimate by 60-80%.
Talk to our teamAbout Anthropic: Claude Sonnet 5.5
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing..
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Frequently asked questions about Anthropic: Claude Sonnet 5.5
How much does Anthropic: Claude Sonnet 5.5 cost?
Anthropic: Claude Sonnet 5.5 costs $2.00 per million input tokens and $10.00 per million output tokens.
What is the context window of Anthropic: Claude Sonnet 5.5?
Anthropic: Claude Sonnet 5.5 has a context window of 1,000,000 tokens (1M).
What can Anthropic: Claude Sonnet 5.5 do?
Anthropic: Claude Sonnet 5.5 supports image/vision input, tool use, and function calling.
Who created Anthropic: Claude Sonnet 5.5?
Anthropic: Claude Sonnet 5.5 is developed by Anthropic and was released on September 28, 2026.