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Step 5 Preview
o1
o1 is a proprietary model from OpenAI, released Dec 17, 2024. It ranks #193 of 351 on the LMArena text leaderboard with a rating of 1366. It costs $15 per million input tokens and $60 per million output tokens, with a 200K-token context window.
- Developer
- OpenAI
- Released
- Dec 17, 2024
- Context window
- 200K
- Price in / out, per 1M tokens
- $15 / $60
- Weights
- Proprietary
- Inputs
- Text, Images, Files
- Reasoning
- Yes
- Tool use
- Yes
The rating LMArena published at each update since Sep 17, 2024. Ratings move as votes come in and new models join.
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| LiveCodeBenchCoding | 50.26% | 117 / 143 | $15 / $60 | |
| MedQAMedicine | 96.52% | 1 / 92 | $15 / $60 | |
| GPQA DiamondReasoning | 73.23% | 88 / 138 | $15 / $60 | |
| MMLU-ProReasoning | 83.49% | 74 / 138 | $15 / $60 | |
| AIMEReasoning | 71.46% | 53 / 96 | $15 / $60 | |
| MMMUReasoning | 77.41% | 53 / 93 | $15 / $60 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1366 | 193 / 351 | 27.8K |
| CodingLMArena | 1367 | 212 / 346 | 4K |
| MathLMArena | 1388 | 181 / 339 | 3K |
| Creative writingLMArena | 1347 | 171 / 349 | 4.6K |
| Instruction followingLMArena | 1367 | 172 / 351 | 10.2K |
| Hard promptsLMArena | 1371 | 190 / 351 | 6.5K |
| Multi-turnLMArena | 1369 | 184 / 349 | 5.9K |
| Long queriesLMArena | 1378 | 177 / 330 | 3.6K |
| ExpertLMArena | 1362 | 190 / 305 | 1.3K |
| Legal and governmentIndustries | 1368 | 191 / 325 | 1.5K |
| Medicine and healthcareIndustries | 1355 | 206 / 325 | 1.3K |
| Business and financeIndustries | 1328 | 214 / 344 | 2.7K |
| ChineseLanguages | 1394 | 185 / 328 | 1.8K |
| SpanishLanguages | 1345 | 201 / 249 | 142 |
| GermanLanguages | 1337 | 182 / 261 | 556 |
| FrenchLanguages | 1345 | 196 / 252 | 290 |
| JapaneseLanguages | 1346 | 132 / 236 | 581 |
| VisionLMArena | 1168 | 111 / 146 | 3.7K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown (o1 (2024-12-17), o1-preview).
Compare o1
OpenAI
The lab behind GPT and ChatGPT, which brought large language models to hundreds of millions of people. Founded 2015, based in San Francisco. openai.com
Questions
Who makes o1?
o1 is made by OpenAI, founded 2015 and based in San Francisco.
How much does o1 cost?
$15 per million input tokens and $60 per million output tokens, at its provider’s list price.
What is o1’s context window?
200K tokens (200,000).
How does o1 rank?
#193 of 351 on LMArena’s text leaderboard, rated 1366 (95% interval 1361–1370) from 27,807 votes, as of Oct 22, 2026.
Is o1 open source?
No. o1 is proprietary and served through its provider’s API.