GPT-5.1-Codex-Mini
Released
GPT-5.1-Codex-Mini is an AI model released by OpenAI on Thursday, Nov 13 2025, the same day as GPT-5.1-Codex. It has a 400k token context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider..
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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.
Frequently asked questions
GPT-5.1-Codex-Mini was released by OpenAI on Thursday, Nov 13 2025.