Audience
Developers, knowledge workers, analysts, business teams, and organizations that want a fast, capable, and relatively cost-efficient AI model for coding, professional work, design-heavy tasks, document creation, and everyday agentic workflows
About Claude Sonnet 5.5
Claude Sonnet 5.5 is Anthropic’s mid-tier Claude 5.5 model designed for fast, well-scoped everyday work, coding, and professional document creation. Anthropic says it runs more than 30% faster than Claude Sonnet 5 and typically costs up to 30% less per task while keeping the same base token pricing. The model shows major gains in agentic coding, with a 70.6% score on Terminal-Bench 4.0 and stronger performance on FrontierCode and CursorBench than its predecessor. Sonnet 5.5 also performs strongly on knowledge work, computer use, chart understanding, and long-horizon tasks, in some cases approaching Claude Opus 5.5 at higher effort settings. Anthropic positions it as especially useful for debugging, routine coding, collaboration, and producing polished documents, slides, spreadsheets, and user interfaces. Claude Sonnet 5.5 is available across Anthropic’s platforms as well as AWS, Google Cloud, and Microsoft Azure.
Pricing
Cache reads, which account for most costs in agentic and coding workloads, are priced at just $0.20 per million tokens
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Product Details
Claude Sonnet 5.5 Frequently Asked Questions
Claude Sonnet 5.5 Product Features
Claude Sonnet 5.5 Verified User Reviews
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Probability You Would Recommend?1 2 3 4 5 6 7 8 9 10
"Really fast/efficient and good reasoning abilities" Posted 2026-09-28
Pros: I can give it a normal development task and it tends to get to the answer with less wandering, fewer unnecessary tool calls, and less back-and-forth than Sonnet 5. Coding is where I notice the improvement the most. It is really good for feature work, fixing bugs, refactoring, and the everyday engineering tasks where I want something fast and capable without automatically reaching for Opus. The speed is another big advantage. Sonnet 5.5 feels better suited to rapid iteration because I can make a change, test it, adjust the prompt, and keep moving without the slower pace I sometimes get from heavier reasoning models.
Cons: The main downside is that I would still move up to Opus 5.5 for really messy architecture problems, long autonomous agent runs, or tasks where I want maximum reasoning depth.
Overall: Claude Sonnet 5.5 is probably the model I would want as my everyday coding workhorse. It is fast, efficient, strong at practical development tasks, and capable enough that I rarely feel like I am sacrificing much by not using a heavier model.
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