Development and release Sam Altman initially planned to include o4-mini in
GPT-5 instead of releasing them as stand-alone models. However, on April 16, 2025, o4-mini was released alongside
OpenAI o3 to paid subscribers and via the
OpenAI API. Both were released as
vision-language models. On April 24, 2025, o4-mini was released to all ChatGPT users, including free-tier users, as well as via the Chat Completions API and Responses API.
OpenAI o3 was made only available to paid subscribers.
Retirement On January 29, 2026, the retirement of
o4-mini was announced. It was retired from ChatGPT on February 13, 2026, alongside
GPT-4o,
GPT-5,
GPT-4.1 mini, and
GPT-4.1. == See also ==