Gemini 4 Argon
Claude Opus 5.5
Muse Wonder
MiMo-V2.6-Pro
Qwen3.8-Max
Kimi K3
GLM-5.3
ERNIE 5.1
DeepSeek-V4.1-Flash-20260910
Grok 4.20 Beta
amazon-nova-experimental-chat
Dola Seed 2.0 Pro
NVIDIA-Nemotron-3-Ultra-550B-A55B
Gemma 4 31B
Step 5 Preview
o3-mini
o3-mini is a proprietary model from OpenAI, released Jan 31, 2025. It ranks #221 of 351 on the LMArena text leaderboard with a rating of 1337. It costs $1.10 per million input tokens and $4.40 per million output tokens, with a 200K-token context window.
- Developer
- OpenAI
- Released
- Jan 31, 2025
- Context window
- 200K
- Price in / out, per 1M tokens
- $1.10 / $4.40
- Weights
- Proprietary
- Inputs
- Text, Files
- Reasoning
- Yes
- Tool use
- Yes
The rating LMArena published at each update since Feb 6, 2025. Ratings move as votes come in and new models join.
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| LiveCodeBenchCoding | 71.48% | 85 / 143 | $1.1 / $4.4 | |
| MedQAMedicine | 94.83% | 14 / 92 | $1.1 / $4.4 | |
| GPQA DiamondReasoning | 75.50% | 82 / 138 | $1.1 / $4.4 | |
| MMLU-ProReasoning | 78.69% | 103 / 138 | $1.1 / $4.4 | |
| AIMEReasoning | 86.46% | 32 / 96 | $1.1 / $4.4 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1337 | 221 / 351 | 18.6K |
| CodingLMArena | 1378 | 199 / 346 | 2.6K |
| MathLMArena | 1396 | 169 / 339 | 1.9K |
| Creative writingLMArena | 1286 | 237 / 349 | 3.1K |
| Instruction followingLMArena | 1337 | 199 / 351 | 6.7K |
| Hard promptsLMArena | 1365 | 193 / 351 | 4.4K |
| Multi-turnLMArena | 1320 | 230 / 349 | 2.5K |
| Long queriesLMArena | 1343 | 208 / 330 | 2.2K |
| ExpertLMArena | 1364 | 187 / 305 | 847 |
| Legal and governmentIndustries | 1329 | 228 / 325 | 1K |
| Medicine and healthcareIndustries | 1330 | 229 / 325 | 824 |
| Business and financeIndustries | 1313 | 230 / 344 | 1.8K |
| ChineseLanguages | 1379 | 200 / 328 | 1.2K |
| SpanishLanguages | 1321 | 207 / 249 | 126 |
| GermanLanguages | 1303 | 197 / 261 | 377 |
| FrenchLanguages | 1334 | 202 / 252 | 203 |
| JapaneseLanguages | 1286 | 171 / 236 | 374 |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown (o3-mini (High), o3-mini).
Compare o3-mini
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 o3-mini?
o3-mini is made by OpenAI, founded 2015 and based in San Francisco.
How much does o3-mini cost?
$1.10 per million input tokens and $4.40 per million output tokens, at its provider’s list price.
What is o3-mini’s context window?
200K tokens (200,000).
How does o3-mini rank?
#221 of 351 on LMArena’s text leaderboard, rated 1337 (95% interval 1331–1342) from 18,589 votes, as of Oct 22, 2026.
Is o3-mini open source?
No. o3-mini is proprietary and served through its provider’s API.