OpenAI o4-mini was a generative pre-trained transformer model created by OpenAI. On April 16, 2025, the o4-mini model was released to all ChatGPT users (including free-tier users) as well as via the Chat Completions API and Responses API.[1][2][3][4] Its retirement from ChatGPT was announced on January 29, 2026,[5] and it was retired on February 13, 2026, alongside GPT-4o, GPT-5, GPT-4.1 mini, and GPT-4.1.[6]
Additionally, OpenAI introduced the o4-mini-high model, which was made available exclusively to paid-tier ChatGPT users. The high model was a slower model which had a higher reasoning effort to produce more accurate responses.[7]
Unlike earlier models, o4-mini was capable of processing both text and images. It also allowed to perform tasks like analyzing whiteboard sketches during its "chain-of-thought" phase.[8]
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