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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 36% of the 226 commercial models tracked here
- 56 of 101 OpenAI models tracked here, from cheapest
Benchmarks & performance
Independent benchmark scores for GPT-5.1, measured by Artificial Analysis. Higher is better. Measurement mode: Non-reasoning.
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.
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 64.3%, MMLU-Pro 80.1%, Humanity's Last Exam 5.3%, Long Context Reasoning 45%, LiveCodeBench 49.4%, AIME 2025 38%, IFBench 43.2%, τ²-Bench 46.5%, Terminal-Bench Hard 22.7%. It is particularly used for mathematical reasoning.