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o1-pro

by OpenAIReleased 19 March 2025

o1-pro reads text, pictures and files and writes back, keeping about 200 pages in mind at once and writing up to 100 pages in one answer. It is o1 given more computing power to think, so answers on hard reasoning questions come back steadier and slower. Use it when a single wrong answer is costly and you can wait; use plain o1 for everyday science and math reasoning, and o3-pro for the same extra-effort approach applied to o3.

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

Questions about o1-pro

  • Is o1-pro still on sale?

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

  • What is o1-pro best for?

    o1-pro reads text, pictures and files and writes back, keeping about 200 pages in mind at once and writing up to 100 pages in one answer. It is o1 given more computing power to think, so answers on hard reasoning questions come back steadier and slower. Use it when a single wrong answer is costly and you can wait; use plain o1 for everyday science and math reasoning, and o3-pro for the same extra-effort approach applied to o3.

  • Does o1-pro work in Arabic, French or Darja?

    OpenAI names no languages for o1-pro. 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 o1-pro open source?

    No. OpenAI has not published its weights.

  • Who makes o1-pro, and when was it released?

    OpenAI. Released 19 March 2025. It knows the world up to 31 October 2023.

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