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GPT-5.1API
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5.
Prices update automatically — checked daily against provider list prices.
- $3.44 per 1M tokens, assuming 3 input for 1 output the convention used by Artificial Analysis
- cheaper than 35% of the 192 commercial models tracked here
- 50 of 88 OpenAI models tracked here, from cheapest
Benchmarks & performance
Independent benchmark scores for GPT-5.1, measured by Artificial Analysis. Higher is better. Measurement mode: high.
Models at this level cost $1.56 per 1M tokens (median of 25) — this one costs $3.44.
Cheaper and better on this index: Grok 4.6 · GPT-5.6 Sol (batch) · GLM 5.3 and 56 more
About this model
GPT-5.1 is a commercial AI model by OpenAI. 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 GPT-5.1?
GPT-5.1 is an AI language model from OpenAI. It is a proprietary model, available through an API. It scores 37.5 on the Artificial Analysis intelligence index.
Is GPT-5.1 free?
GPT-5.1 is not free: it costs $1.25 per million input tokens and $10 per million output tokens. Open-weight alternatives can be self-hosted at no per-token cost.
What is GPT-5.1 good at?
Independent benchmarks from Artificial Analysis give it GPQA 87.3%, MMLU-Pro 87%, Humanity's Last Exam 28.5%, Long Context Reasoning 76.7%, LiveCodeBench 86.8%, SciCode 43.3%, AIME 2025 94%, IFBench 72.9%, τ²-Bench 81.9%, τ-Bench Banking 15.9%, Terminal-Bench 52.4%, Terminal-Bench Hard 45.5%. It is particularly used for code generation.