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GPT-5.6 Luna ProAPI
GPT-5.6 Luna Pro (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.
About this model
GPT-5.6 Luna Pro 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 Pro?
GPT-5.6 Luna Pro is an AI language model from OpenAI. It is a proprietary model, available through an API.
Is GPT-5.6 Luna Pro free?
GPT-5.6 Luna Pro is not free: it costs $1 per million input tokens and $6 per million output tokens. Open-weight alternatives can be self-hosted at no per-token cost.
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.