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GPT-5.6 LunaAPI
GPT-5.6 Luna (OpenAI): live API pricing, context window and the best open-source alternatives, tracked daily by OpenSourceAI.tech.
Prices update automatically — checked hourly against provider list prices.
Benchmarks & performance
Independent benchmark scores for GPT-5.6 Luna, measured by Artificial Analysis. Higher is better. Measurement mode: max.
About this model
GPT-5.6 Luna 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-5.6 Luna?
GPT-5.6 Luna is an AI language model from OpenAI. It is a proprietary model, available through an API. It scores 51.2 on the Artificial Analysis intelligence index.
Is GPT-5.6 Luna free?
GPT-5.6 Luna is not free: it costs $0.5 per million input tokens and $3 per million output tokens. Open-weight alternatives can be self-hosted at no per-token cost.
What is GPT-5.6 Luna good at?
Independent benchmarks from Artificial Analysis give it GPQA 91.1%, Humanity's Last Exam 37.2%, Long Context Reasoning 74%, SciCode 52.5%, τ-Bench Banking 27.2%, Terminal-Bench 80.9%. It is particularly used for code generation.
How fast is GPT-5.6 Luna?
It generates about 205.4 tokens per second, with a median 73.7s delay before the first token. Measured independently by Artificial Analysis.
Open-source alternatives
Depending on your workload, an open-weight model that you can self-host may cut costs dramatically or remove per-token pricing entirely. Our comparison pages put this model side by side with the strongest open-source contenders.