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Claude Opus 4.5API
Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use.
Prices update automatically — checked daily against provider list prices.
- $10 per 1M tokens, assuming 3 input for 1 output the convention used by Artificial Analysis
- cheaper than 9% of the 220 commercial models tracked here
- 24 of 30 Anthropic models tracked here, from cheapest
Benchmarks & performance
Independent benchmark scores for Claude Opus 4.5, measured by Artificial Analysis. Higher is better. Measurement mode: Reasoning.
About this model
Claude Opus 4.5 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 4.5?
Claude Opus 4.5 is an AI language model from Anthropic. It is a proprietary model, available through an API.
Is Claude Opus 4.5 free?
Claude Opus 4.5 is not free: it costs $5 per million input tokens and $25 per million output tokens. Open-weight alternatives can be self-hosted at no per-token cost.
What is Claude Opus 4.5 good at?
Independent benchmarks from Artificial Analysis give it GPQA 86.6%, MMLU-Pro 89.5%, Humanity's Last Exam 30.1%, Long Context Reasoning 77.3%, LiveCodeBench 87.1%, AIME 2025 91.3%, IFBench 58%, τ²-Bench 89.5%, Terminal-Bench Hard 47%.