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Claude Opus 4.5API
Claude Opus 4.5 (Anthropic): live API pricing, context window and the best open-source alternatives, tracked daily by olud.ai.
Prices update automatically — checked hourly against provider list prices.
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 hourly 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. It scores 40.8 on the Artificial Analysis intelligence index.
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 28.4%, Long Context Reasoning 74%, LiveCodeBench 87.1%, SciCode 49.5%, AIME 2025 91.3%, IFBench 58%, τ²-Bench 89.5%, Terminal-Bench Hard 47%. It is particularly used for mathematical reasoning.