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Claude Sonnet 4API
Claude Sonnet 4 significantly enhances the capabilities of its predecessor, Sonnet 3.7, excelling in both coding and reasoning tasks with improved precision and controllability.
Prices update automatically — checked daily against provider list prices.
- $6 per 1M tokens, assuming 3 input for 1 output the convention used by Artificial Analysis
- cheaper than 18% of the 192 commercial models tracked here
- 15 of 28 Anthropic models tracked here, from cheapest
Benchmarks & performance
Independent benchmark scores for Claude Sonnet 4, measured by Artificial Analysis. Higher is better. Measurement mode: Reasoning.
Models at this level cost $0.69 per 1M tokens (median of 14) — this one costs $6.
Cheaper and better on this index: Claude Opus 5 (batch) · GPT-5.6 Sol · Grok 4.6 and 106 more
About this model
Claude Sonnet 4 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 4?
Claude Sonnet 4 is an AI language model from Anthropic. It is a proprietary model, available through an API. It scores 29.8 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 10.7%, Long Context Reasoning 69.7%, 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 16.7%, Terminal-Bench 36.3%, Terminal-Bench Hard 31.1%. It is particularly used for code generation.