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o4 Mini High

by OpenAIReleased 16 April 2025

o4-mini-high is o4-mini with its thinking effort fixed at high. It reads text, pictures and files and writes back, keeping about 200 pages in mind at once. It is for math, science, visual problem solving and code edits where you want the compact model to think longer on every request, with connected tools and fixed-format answers available.

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.

reasoningreasoning_effortinclude_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 High

  • Is o4 Mini High still on sale?

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

  • What is o4 Mini High best for?

    o4-mini-high is o4-mini with its thinking effort fixed at high. It reads text, pictures and files and writes back, keeping about 200 pages in mind at once. It is for math, science, visual problem solving and code edits where you want the compact model to think longer on every request, with connected tools and fixed-format answers available.

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

    OpenAI names no languages for o4 Mini High. 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 High open source?

    No. OpenAI has not published its weights.

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

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

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