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Compare two models.

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OpenAI

GPT-4o (Mar 2025)

Release page →

Microsoft

Phi-4

The basics

Released

Mar 27, 2025

Dec 12, 2024

What it does

Knowledge cutoff

The latest events it learned about

September 2023

Not published

Download

No: it runs on the maker's servers

FreeOpen weights

Where to use it

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

Microsoft's app: Microsoft Copilot ↗

Price and limits, for developers

Input

Per million tokens

$2.50

$0.07Cheaper

Output

Per million tokens

$10.00

$0.14Cheaper

Cached input

Per million tokens

$1.25

Not listed

Context window

How much it takes in at once

128K tokens about 96,000 wordsBigger

16K tokens about 12,000 words

Longest answer

16K tokens about 12,000 words

Not listed

How they score

Combined test score

Epoch Capabilities Index · Epoch AI

129#148 of 235

129#147 of 235

Too close to call: GPT-4o (Mar 2025) and Phi-4 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 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.