OpenAI GPT-5.6 Luna - Box Dev Docs

According to OpenAI, OpenAI GPT-5.6 Luna is designed for cost-sensitive, high-volume workloads. It roughly corresponds to the nano model tier used in earlier GPT-5 families.

Model details

Item	Value	Description
Model name	GPT-5.6 Luna	The name of the model.
Model category	Standard	The category of the model: Standard or Premium.
API model name	`openai__gpt_5_6_luna`	The name of the model that is used in the . You must provide this exact name for the API to work.
Compliance	N/A	Government compliance frameworks and authorizations applicable to this model.
Hosting layer	OpenAI	The trusted organization that securely hosts the LLM.
Model provider	OpenAI	The organization that provides this model.
Release date	July 9th, 2026	The release date for the model.
Knowledge cutoff date	February 16th, 2026	The date after which the model does not get any information updates.
Input context window	1m tokens	The number of tokens supported by the input context window.
Maximum output tokens	128k tokens	The number of tokens that can be generated by the model in a single request.
Empirical throughput	Not specified	The number of tokens the model can generate per second.
Open source	No	Specifies if the model’s code is available for public use.

Additional documentation

For additional information, see official OpenAI GPT-5.6 Luna documentation.

Last modified on October 12, 2026