> o1 is a closed AI model from OpenAI, released 5 Dec 2024. Index score 136 (GPT-4 = 100), rank 102 of 229 ranked models. API price $15 in / $60 out per million tokens, 200K context.

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# o1

OpenAI

Released 5 Dec 2024

Closed

Reasoning

[Compare](https://themodelindex.org/compare/o1-vs-deepseek-v3/)

136124–147

Index score

#102 of 229 models

Pro mode: 131 · $150 / $600

4/ 8

Core tests taken

3 of 6 areas · plus 15 anchor tests

Frontier

Versus the frontier at release

set or matched the record

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

$15/ $60

Price per million tokens

input / output, list price

200K

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 11 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

77%

Humanity's Last Exam

8%

Maths

evidence

FrontierMath T1-3

15%

Coding

evidence

SWE-bench Verified

no result

Terminal-Bench

no result

Agents

evidence

APEX-Agents

no result

Novel problems

evidence

ARC-AGI-2

no result

Long tasks

evidence

METR time horizon

39 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

#102

of 219 · 136

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

↗

#### API providers · 1 · per million tokens, in / out

O

OpenAI

$15 / $60

cheapest

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

5 Dec 2024

Announcement

not linked yet

Release entry

o1 (full) + o1 pro

Scored as

o1

Artificial Analysis index

–

Pro mode

index 131 · $150 / $600 per M

Output speed

–

Hugging Face

closed weights

## OpenAI releases · around this one

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

GPT-4.5

Closed

27 FEB 2025

index 124

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