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Claude Sonnet 4API
Claude Sonnet 4 (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 Sonnet 4, measured by Artificial Analysis. Higher is better. Measurement mode: Reasoning.
About this model
Claude Sonnet 4 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 Sonnet 4?
Claude Sonnet 4 is an AI language model from Anthropic. It is a proprietary model, available through an API. It scores 28.9 on the Artificial Analysis intelligence index.
Is Claude Sonnet 4 free?
Claude Sonnet 4 is not free: it costs $3 per million input tokens and $15 per million output tokens. Open-weight alternatives can be self-hosted at no per-token cost.
What is Claude Sonnet 4 good at?
Independent benchmarks from Artificial Analysis give it GPQA 77.7%, MMLU-Pro 84.2%, Humanity's Last Exam 9.6%, Long Context Reasoning 64.7%, LiveCodeBench 65.5%, SciCode 40%, MATH-500 99.1%, AIME 77.3%, AIME 2025 74.3%, IFBench 54.7%, τ²-Bench 64.6%, τ-Bench Banking 13.8%, Terminal-Bench 36.3%, Terminal-Bench Hard 31.1%. It is particularly used for code generation.