Anthropic
Available in Shortly AI
Claude Sonnet 5.5
Released September 28, 2026
ReasoningVision (Image)Tool Use
Claude Sonnet 5.5 is a step-change improvement over Sonnet 5 for well-scoped everyday work like building features, fixing bugs, and creating polished documents, slides, and spreadsheets. It also writes more clearly than Sonnet 5.
- Context window
- 1M tokens
- Maximum output
- 128K tokens
- Input pricing
- $2.00/M
- Output pricing
- $10.00/M
Independent benchmark
LiveBench performance
80.0overall
Benchmark data from LiveBench 2.0, release 2026-10-25.
63.4
91.6
94.7
89.3
59.5
83.6
85.0
| Category | Score |
|---|---|
| Long Agentic | 63.400 |
| Reasoning | 91.600 |
| Coding | 94.700 |
| Browser Use | 89.300 |
| Data Analysis | 59.500 |
| Research | 83.600 |
| Design | 85.000 |
Benchmarks measure selected evaluation tasks and do not guarantee performance for every prompt or workflow.
FAQ
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