GPT-5.6 Luna

Language Proprietary

Context

About GPT-5.6 Luna

GPT-5.6 Luna is an AI model developed by OpenAI, in the language category, released in 2026, made available as a proprietary (API-only) model. GPT-5.6 Luna is the fastest and most cost-efficient tier of OpenAI's GPT-5.6 family, released for general availability J.

On this page you'll find GPT-5.6 Luna's full specifications, including a context window of 1M tokens. Review provider pricing and benchmark scores below, or compare GPT-5.6 Luna head-to-head with other language models.

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Frequently asked questions

What is GPT-5.6 Luna? ▶

GPT-5.6 Luna is the fastest and most cost-efficient tier of OpenAI's GPT-5.6 family, released for general availability J It is tracked on GenAIList with its specifications, benchmark scores and provider pricing.

Who created GPT-5.6 Luna? ▶

GPT-5.6 Luna was developed by OpenAI and released in 2026.

Is GPT-5.6 Luna open source or proprietary? ▶

GPT-5.6 Luna is a proprietary model. It is accessed through an API rather than by downloading the weights.

What is GPT-5.6 Luna's context window? ▶

GPT-5.6 Luna supports a context window of 1M tokens.

How much does GPT-5.6 Luna cost? ▶

Pricing for GPT-5.6 Luna depends on the provider. See the providers table on this page for the latest API rates.

How does GPT-5.6 Luna perform on benchmarks? ▶

Benchmark scores for GPT-5.6 Luna are listed on this page as they are published. You can compare it head-to-head with other models on the GenAIList compare tool.