OpenAI GPT-5.1
OpenAI GPT-5.1
OpenAI GPT-5.1 is a multimodal model designed for coding and agentic tasks with configurable reasoning effort.
Model details
| Item | Value | Description |
|---|---|---|
| Model name | GPT-5.1 | The name of the model. |
| Model category | Premium | The category of the model: Standard or Premium. |
| API model name | openai__gpt_5_1 | The name of the model that is used in the Box AI API for model overrides. The user must provide this exact name for the API to work. |
| Hosting layer | OpenAI | The trusted organization that securely hosts LLM. |
| Model provider | OpenAI | The organization that provides this model. |
| Release date | November 13th, 2025 | The release date for the model. |
| Knowledge cutoff date | September 30th, 2024 | The date after which the model does not get any information updates. |
| Input context window | 400k 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 documentation.