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OpenAI

o3-mini

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OpenAI

GPT-4o (Mar 2025)

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The basics

Released

Jan 31, 2025

Mar 27, 2025

What it does

Knowledge cutoff

The latest events it learned about

May 2024More recent

September 2023

Download

No: it runs on the maker's servers

Where to use it

OpenAI's app: ChatGPT ↗Also for developers, through an API

Price and limits, for developers

Input

Per million tokens

$1.10Cheaper

$2.50

Output

Per million tokens

$4.40Cheaper

$10.00

Cached input

Per million tokens

$0.55Cheaper

$1.25

Context window

How much it takes in at once

200K tokens about 150,000 wordsBigger

128K tokens about 96,000 words

Longest answer

100K tokens about 75,000 wordsLonger

16K tokens about 12,000 words

How they score

Combined test score

Epoch Capabilities Index · Epoch AI

141#115 of 235Higher

129#148 of 235

o3-mini scores 12 points higher, a big step.

Green marks the better of the two on each row, red the other. Rows where one side isn't listed, or where the gap is too close to call, stay plain.

Popular comparisons

Not sure where to start? Which AI should I use? gives a pick for what you want to do. How to read AI rankings explains the numbers.

Rankings from LMArena and Epoch AI, both CC BY 4.0, updated 7h ago. Developer prices, context windows and knowledge cutoffs from the labs' own listings on models.dev and from OpenRouter. The app links go to each maker's own app when no source says exactly where the model is available.