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Claude Opus 5.5API
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.
Prices update automatically — checked daily against provider list prices.
- $8 per 1M tokens, assuming 3 input for 1 output the convention used by Artificial Analysis
- cheaper than 15% of the 227 commercial models tracked here
- 20 of 31 Anthropic models tracked here, from cheapest
Benchmarks & performance
Independent benchmark scores for Claude Opus 5.5, measured by Artificial Analysis. Higher is better. Measurement mode: Max, Default Fallback.
Models at this level cost $4 per 1M tokens (median of 3) — this one costs $8.
No model tracked here is both cheaper and better on this index.
About this model
Claude Opus 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 Opus 5.5?
Claude Opus 5.5 is an AI language model from Anthropic. It is a proprietary model, available through an API. It scores 57.6 on the Artificial Analysis intelligence index.
Is Claude Opus 5.5 free?
Claude Opus 5.5 is not free: it costs $4 per million input tokens and $20 per million output tokens. Open-weight alternatives can be self-hosted at no per-token cost.
What is Claude Opus 5.5 good at?
Independent benchmarks from Artificial Analysis give it Humanity's Last Exam 61.4%, Long Context Reasoning 84.7%, SciCode 66.9%.
How fast is Claude Opus 5.5?
It generates about 97.5 tokens per second, with a median 534.53s delay before the first token. Measured independently by Artificial Analysis.