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OpenAI

Gpt Oss 120b

OpenAI

o3-mini

Release page →

The basics

Released

Aug 5, 2025

Jan 31, 2025

What it does

Knowledge cutoff

The latest events it learned about

Not published

May 2024

Download

FreeOpen weights

No: it runs on the maker's servers

Where to use it

OpenAI's app: ChatGPT ↗

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

Price and limits, for developers

Input

Per million tokens

$0.15Cheaper

$1.10

Output

Per million tokens

$0.60Cheaper

$4.40

Cached input

Per million tokens

$0.075Cheaper

$0.55

Context window

How much it takes in at once

131K tokens about 98,000 words

200K tokens about 150,000 wordsBigger

Longest answer

66K tokens about 49,000 words

100K tokens about 75,000 wordsLonger

How they score

Combined test score

Epoch Capabilities Index · Epoch AI

140#118 of 237

141#117 of 237

Too close to call: Gpt Oss 120b and o3-mini are within the margin of error.

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 5h 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.