Learn · Compare

Compare two models.

Side by side

Swap

Llama 3.1-405B

OpenAI

GPT-4o (Mar 2025)

Release page →

The basics

Released

Jul 23, 2024

Mar 27, 2025

What it does

Knowledge cutoff

The latest events it learned about

Not published

September 2023

Download

FreeOpen weights, licence has limits

No: it runs on the maker's servers

Where to use it

Meta's app: Meta AI ↗

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

Price and limits, for developers

Input

Per million tokens

Not listed

$2.50

Output

Per million tokens

Not listed

$10.00

Cached input

Per million tokens

Not listed

$1.25

Context window

How much it takes in at once

Not listed

128K tokens about 96,000 words

Longest answer

Not listed

16K tokens about 12,000 words

How they score

Combined test score

Epoch Capabilities Index · Epoch AI

128#151 of 237

129#150 of 237

Too close to call: Llama 3.1-405B and GPT-4o (Mar 2025) 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 2h 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.