OpenAI GPT-5.4 - Box Dev Docs

According to OpenAI, OpenAI GPT-5.4 is a frontier model, unifying the Codex and GPT lines into a single system. It features a 1m+ token context window with support for text and image inputs, enabling high-context reasoning, coding, and multimodal analysis within the same workflow.

Model details

Item	Value	Description
Model name	GPT-5.4	The name of the model.
Model category	Premium	The category of the model: Standard or Premium.
API model name	`openai__gpt_5_4`	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	March 5th, 2026	The release date for the model.
Knowledge cutoff date	August 31st, 2025	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 .

Last modified on May 27, 2026

OpenAI GPT-5.5

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​Model details

​Additional documentation

Model details

Additional documentation