OpenAI

o1

CTX200K

Retired

61Quality

Reasoning · Vision · Tools

Input$15/M

Output$60/M

O-series reasoning model for hard analysis, math, coding, and planning

PaidProprietary449/1044

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OpenAITextHolo rareRetired

o1

O-series reasoning model for hard analysis, math, coding, and planning

o1

Type: Text
Quality: 61 · Top 39% on the Epoch Capabilities Index
Context window: 200,000 tokens
Max output: 100,000 tokens
Input price: $15.00 / 1M tokens
Output price: $60.00 / 1M tokens
Cache read: $7.50 / 1M tokens
Cache write: —
Released: Dec 5, 2024
Knowledge cutoff: Sep 2023
Takes in: Text, Image, PDF
Puts out: Text
Reasoning: Yes
Tool calling: Yes
Structured output: Yes
File attachments: Yes
Access: Paid
License: Proprietary
Rarity: Holo rare
Set number: 449/1044

Open OpenAI docs Quality 61 Evolution 1/2 Meet its creature Battle Claude Fable 5.1

Weights aren’t public. Use is governed by OpenAI’s terms. Specs from models.dev, last changed Oct 19, 2026. Official source: platform.openai.com.

How good is it?

Public leaderboard scores for o1, refreshed daily from Epoch AI and LMArena.

Top 39% of the 277 models on the Epoch Capabilities Index: #109.

Quality is the share of a leaderboard’s models this one beats, from 0 to 100. Chat models are rated on Epoch AI’s Capabilities Index when it lists them, otherwise on LMArena; image and video models on LMArena’s image and video arenas.

Leaderboards

Epoch Capabilities Index#109 of 277
One number fitted from dozens of hard benchmarks, from science questions to agentic coding.141.8 index
LMArena Text#191 of 416
People compare two anonymous answers and vote for the better one.1,366 rating
Listed as o1-2024-12-17
LMArena Text · Coding#210 of 411
The text arena’s coding prompts only.1,367 rating
Listed as o1-2024-12-17
LMArena Text · Math#177 of 400
The text arena’s math prompts only.1,388 rating
Listed as o1-2024-12-17
LMArena Text · Creative writing#169 of 414
The text arena’s creative writing prompts only.1,347 rating
Listed as o1-2024-12-17
LMArena Vision#109 of 165
Questions about images, voted by people.1,168 rating
Listed as o1-2024-12-17

Benchmarks Epoch AI runs

Scores from Epoch AI and LMArena, licensed CC BY 4.0. Boards list models under their own names, so a close match is shown with the name it was scored under. Credits

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Current text models from other labs at a similar output price.

o1

o1

How good is it?

Leaderboards

Benchmarks Epoch AI runs

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