# GPT-5.1-Codex-Mini

GPT-5.1-Codex-Mini is an AI model released by OpenAI on Nov 13 2025. It has a 400k context window.

## Facts

| Field | Value |
| --- | --- |
| Model | GPT-5.1-Codex-Mini |
| Developer | OpenAI |
| Release date | Thursday, Nov 13 2025 |
| Licensing | Closed |
| Context window | 400k |

## About GPT-5.1-Codex-Mini

GPT-5.1-Codex-Mini was the smaller coding model in OpenAI’s November 13, 2025 Codex release. Developers could select it alongside GPT-5.1-Codex for work in the CLI or IDE extension.

It followed GPT-5-Codex-Mini, which OpenAI had added to the CLI on November 7. OpenAI documented a separate API identifier and a 400,000-token context window for the 5.1 Mini model.

## Questions and answers

### When was GPT-5.1-Codex-Mini released?

GPT-5.1-Codex-Mini was released by OpenAI on Thursday, Nov 13 2025.

### Who made GPT-5.1-Codex-Mini?

GPT-5.1-Codex-Mini was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.

### What is the context window of GPT-5.1-Codex-Mini?

GPT-5.1-Codex-Mini has a context window of 400k. Providers may specify separate input and output token limits.

### Is GPT-5.1-Codex-Mini open source?

No. GPT-5.1-Codex-Mini is a closed model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

### What came before and after GPT-5.1-Codex-Mini?

OpenAI's previous tracked release was GPT-5.1-Codex on Nov 13 2025. It was followed by GPT-5.1-Codex-Max on Nov 19 2025.


---

Canonical page: https://aireleasetracker.com/model/openai/gpt-5.1-codex-mini
Site index: https://aireleasetracker.com/llms.txt
Source: AI Release Tracker (https://aireleasetracker.com). Most benchmark scores come from lab launch material; gathered results identify the leaderboard that published them.