> o1-preview is a closed AI model from OpenAI, released 12 Sep 2024. Index score 121 (GPT-4 = 100), rank 137 of 229 ranked models.

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# o1-preview

OpenAI

Released 12 Sep 2024

Closed

Reasoning

Date verified

[Compare](https://themodelindex.org/compare/o1-preview-vs-qwen2-5/) [Announcement](https://openai.com/index/introducing-openai-o1-preview/)

121110–133

Index score

#137 of 229 models

2/ 8

Core tests taken

2 of 6 areas · plus 6 anchor tests

−2

Versus the frontier at release

best then: o1-mini

Replaced by [o3](https://themodelindex.org/models/o3-2025-04/)

–

Price per million tokens

no public API price found

–

Context window

tokens it reads at once

## Where it sits · on the frontier

_Chart: Model Index score of every scored model since late 2022, with the best closed and best open model over time_

Among the first models to reach this score.

## Test results · by area · tick = best by any model

Show 5 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

50%

Humanity's Last Exam

no result

Maths

evidence

FrontierMath T1-3

no result

Coding

evidence

SWE-bench Verified

no result

Terminal-Bench

no result

Agents

no evidence yet

APEX-Agents

no result

Novel problems

evidence

ARC-AGI-2

no result

Long tasks

evidence

METR time horizon

20 min

Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.

## What others say · rank on each leaderboard

The Model Index

independent tests, our method

#137

of 219 · 121

LMArena · Creative writing

creative writing

#141

of 386 · 1366

Epoch Capabilities Index

overall capability from many benchmarks

#96

of 239 · 141.9

LMArena · Text

overall chat quality, judged by people

#156

of 388 · 1389

LMArena · Maths

maths questions in chat

#159

of 373 · 1386

LMArena · Coding

coding questions in chat

#174

of 383 · 1416

Further left is better. Leaderboards measure different things: LMArena is people voting blind between two answers, the others are test scores. Click any row for the source.

## Best at · top three among current models

Replaced by o3; it no longer leads any category among current models.

Where this model places in the top three of today's models, on category leaderboards and on our core tests.

## Where to use it · prices checked 1 Oct 2026

#### From the lab

ChatGPT

app · subscription

↗

OpenAI API

API

↗

Provider prices come from OpenRouter's live listing; going direct to a provider can differ. Subscriptions are the lab's own apps.

## Facts and sources

Released

12 Sep 2024

Announcement

[openai.com ↗](https://openai.com/index/introducing-openai-o1-preview/)

Release entry

o1-preview / o1-mini

Scored as

o1-preview

Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## OpenAI releases · around this one

GPT-4o mini

Closed

18 JUL 2024

index 105

o1-mini

Closed

12 SEP 2024

index 123

o1-preview

Closed

12 SEP 2024

index 121

o1

Closed

5 DEC 2024

index 136

o3-mini

Closed

31 JAN 2025

index 132

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Source: https://themodelindex.org/models/o1-preview/ · The Model Index · data as of 2026-10-01