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GPT-5.1 ChatAPI
GPT-5.1 Chat (OpenAI): 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 GPT-5.1 Chat, measured by Artificial Analysis. Higher is better. Measurement mode: Non-reasoning.
About this model
GPT-5.1 Chat is a commercial AI model by OpenAI. 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 GPT-5.1 Chat?
GPT-5.1 Chat is an AI language model from OpenAI. It is a proprietary model, available through an API. It scores 20.4 on the Artificial Analysis intelligence index.
Is GPT-5.1 Chat free?
GPT-5.1 Chat 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 Chat good at?
Independent benchmarks from Artificial Analysis give it GPQA 64.3%, MMLU-Pro 80.1%, Humanity's Last Exam 5.2%, Long Context Reasoning 44%, LiveCodeBench 49.4%, SciCode 36.5%, AIME 2025 38%, IFBench 43.2%, τ²-Bench 46.5%, Terminal-Bench Hard 22.7%. It is particularly used for mathematical reasoning.