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Step 5 Preview
GPT-5 nano
GPT-5 nano is a proprietary model from OpenAI, released Aug 7, 2025. It ranks #234 of 351 on the LMArena text leaderboard with a rating of 1320. It costs $0.05 per million input tokens and $0.40 per million output tokens, with a 400K-token context window.
- Developer
- OpenAI
- Released
- Aug 7, 2025
- Context window
- 400K
- Price in / out, per 1M tokens
- $0.05 / $0.40
- Weights
- Proprietary
- Inputs
- Text, Images, Files
- Reasoning
- Yes
- Tool use
- Yes
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| LiveCodeBenchCoding | 70.22% | 90 / 143 | $0.05 / $0.4 | |
| MedCodeMedicine | 30.44% | 96 / 107 | $0.05 / $0.4 | |
| MedQAMedicine | 93.26% | 23 / 92 | $0.05 / $0.4 | |
| GPQA DiamondReasoning | 63.38% | 107 / 138 | $0.05 / $0.4 | |
| MMLU-ProReasoning | 76.07% | 109 / 138 | $0.05 / $0.4 | |
| AIMEReasoning | 81.18% | 45 / 96 | $0.05 / $0.4 | |
| MMMUReasoning | 70.94% | 69 / 93 | $0.05 / $0.4 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1320 | 234 / 351 | 8.1K |
| CodingLMArena | 1351 | 227 / 346 | 1.7K |
| MathLMArena | 1318 | 226 / 339 | 493 |
| Creative writingLMArena | 1250 | 269 / 349 | 910 |
| Instruction followingLMArena | 1306 | 230 / 351 | 2K |
| Hard promptsLMArena | 1328 | 229 / 351 | 3.8K |
| Multi-turnLMArena | 1312 | 239 / 349 | 1.4K |
| Long queriesLMArena | 1312 | 238 / 330 | 1.6K |
| ExpertLMArena | 1321 | 222 / 305 | 338 |
| Legal and governmentIndustries | 1299 | 257 / 325 | 470 |
| Medicine and healthcareIndustries | 1336 | 223 / 325 | 471 |
| Business and financeIndustries | 1311 | 233 / 344 | 1.5K |
| ChineseLanguages | 1356 | 215 / 328 | 512 |
| SpanishLanguages | 1360 | 181 / 249 | 237 |
| GermanLanguages | 1327 | 186 / 261 | 206 |
| JapaneseLanguages | 1227 | 198 / 236 | 147 |
| VisionLMArena | 1160 | 115 / 146 | 3.9K |
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-5 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-5 nano?
GPT-5 nano is made by OpenAI, founded 2015 and based in San Francisco.
How much does GPT-5 nano cost?
$0.05 per million input tokens and $0.40 per million output tokens, at its provider’s list price.
What is GPT-5 nano’s context window?
400K tokens (400,000).
How does GPT-5 nano rank?
#234 of 351 on LMArena’s text leaderboard, rated 1320 (95% interval 1313–1327) from 8,134 votes, as of Oct 22, 2026.
Is GPT-5 nano open source?
No. GPT-5 nano is proprietary and served through its provider’s API.