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Claude Sonnet 5.5API
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade.
Prices update automatically — checked daily against provider list prices.
- $4 per 1M tokens, assuming 3 input for 1 output the convention used by Artificial Analysis
- cheaper than 28% of the 223 commercial models tracked here
- 9 of 31 Anthropic models tracked here, from cheapest
Benchmarks & performance
Independent benchmark scores for Claude Sonnet 5.5, measured by Artificial Analysis. Higher is better. Measurement mode: Max, Default Fallback.
Models at this level cost $8 per 1M tokens (median of 5) — this one costs $4.
No model tracked here is both cheaper and better on this index.
About this model
Claude Sonnet 5.5 is a commercial AI model by Anthropic. The specifications below are tracked automatically: pricing is refreshed daily from public list prices, so the numbers on this page reflect the current cost of using the model through its API.
Frequently asked questions
What is Claude Sonnet 5.5?
Claude Sonnet 5.5 is an AI language model from Anthropic. It is a proprietary model, available through an API. It scores 56 on the Artificial Analysis intelligence index.
Is Claude Sonnet 5.5 free?
Claude Sonnet 5.5 is not free: it costs $2 per million input tokens and $10 per million output tokens. Open-weight alternatives can be self-hosted at no per-token cost.
What is Claude Sonnet 5.5 good at?
Independent benchmarks from Artificial Analysis give it Humanity's Last Exam 55%, Long Context Reasoning 82.7%, SciCode 61%.
How fast is Claude Sonnet 5.5?
It generates about 133 tokens per second, with a median 269.77s delay before the first token. Measured independently by Artificial Analysis.