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o4 Mini

by OpenAIReleased 16 April 2025

o4-mini reads text, pictures and files and writes back, keeping about 200 pages in mind at once. It is the small thinking model of its line: accurate on math and science, able to solve visual problems, edit code, use connected tools and fill in the exact form you give it, and quick enough for steady heavy traffic. It beats o3-mini and gets close to o3 in some areas.

TakesTextImagesFiles
GivesText

Reads about 200 pages · writes up to 100 pages

Parameters you can send

Standard OpenAI fields, grouped by what they control. Anything not listed is accepted and ignored.

Shaping the reply

How long, how varied, where to stop.

max_tokensseed

Reasoning

Let it think before answering — and see the thinking.

reasoninginclude_reasoning

Structured output

Get JSON you can parse instead of prose.

response_formatstructured_outputs

Tools

Let the model call your functions.

toolstool_choice

Questions about o4 Mini

  • Is o4 Mini still on sale?

    No. OpenAI has retired it. Other OpenAI models are on sale.

  • What is o4 Mini best for?

    o4-mini reads text, pictures and files and writes back, keeping about 200 pages in mind at once. It is the small thinking model of its line: accurate on math and science, able to solve visual problems, edit code, use connected tools and fill in the exact form you give it, and quick enough for steady heavy traffic. It beats o3-mini and gets close to o3 in some areas.

  • Does o4 Mini work in Arabic, French or Darja?

    OpenAI names no languages for o4 Mini. Arabic, French and Darja: not stated.

  • Can it read PDFs, images or a whole book?

    It reads text, images and PDFs. Up to 200K tokens in one request, about 200 pages. It writes up to 75 000 words at once.

  • Is o4 Mini open source?

    No. OpenAI has not published its weights.

  • Who makes o4 Mini, and when was it released?

    OpenAI. Released 16 April 2025. It knows the world up to 30 June 2024.

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