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GPT-4.1 nano
GPT-4.1 nano is a proprietary model from OpenAI, released Apr 14, 2025. It ranks #266 of 351 on the LMArena text leaderboard with a rating of 1285. It costs $0.10 per million input tokens and $0.40 per million output tokens, with a 1M-token context window.
- Developer
- OpenAI
- Released
- Apr 14, 2025
- Context window
- 1M
- Price in / out, per 1M tokens
- $0.10 / $0.40
- Weights
- Proprietary
- Inputs
- Images, Text, Files
- Reasoning
- No
- Tool use
- Yes
The rating LMArena published at each update since Apr 23, 2025. Ratings move as votes come in and new models join.
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| LiveCodeBenchCoding | 42.72% | 126 / 143 | $0.1 / $0.4 | |
| MedQAMedicine | 68.22% | 81 / 92 | $0.1 / $0.4 | |
| GPQA DiamondReasoning | 50.76% | 120 / 138 | $0.1 / $0.4 | |
| MMLU-ProReasoning | 63.48% | 133 / 138 | $0.1 / $0.4 | |
| AIMEReasoning | 26.46% | 76 / 96 | $0.1 / $0.4 | |
| MMMUReasoning | 55.05% | 89 / 93 | $0.1 / $0.4 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1285 | 266 / 351 | 6.1K |
| CodingLMArena | 1306 | 258 / 346 | 807 |
| MathLMArena | 1274 | 259 / 339 | 582 |
| Creative writingLMArena | 1260 | 263 / 349 | 1K |
| Instruction followingLMArena | 1266 | 262 / 351 | 2K |
| Hard promptsLMArena | 1286 | 257 / 351 | 1.7K |
| Multi-turnLMArena | 1277 | 267 / 349 | 1K |
| Long queriesLMArena | 1282 | 265 / 330 | 730 |
| ExpertLMArena | 1272 | 245 / 305 | 328 |
| Legal and governmentIndustries | 1300 | 255 / 325 | 382 |
| Medicine and healthcareIndustries | 1276 | 260 / 325 | 302 |
| Business and financeIndustries | 1267 | 258 / 344 | 651 |
| ChineseLanguages | 1270 | 263 / 328 | 246 |
| GermanLanguages | 1288 | 204 / 261 | 222 |
| JapaneseLanguages | 1198 | 215 / 236 | 160 |
| VisionLMArena | 1063 | 139 / 146 | 1.2K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare GPT-4.1 nano
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 GPT-4.1 nano?
GPT-4.1 nano is made by OpenAI, founded 2015 and based in San Francisco.
How much does GPT-4.1 nano cost?
$0.10 per million input tokens and $0.40 per million output tokens, at its provider’s list price.
What is GPT-4.1 nano’s context window?
1M tokens (1,047,576).
How does GPT-4.1 nano rank?
#266 of 351 on LMArena’s text leaderboard, rated 1285 (95% interval 1277–1292) from 6,103 votes, as of Oct 22, 2026.
Is GPT-4.1 nano open source?
No. GPT-4.1 nano is proprietary and served through its provider’s API.