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Step-3
Step-3 is an open-weight model from StepFun. It ranks #210 of 351 on the LMArena text leaderboard with a rating of 1350.
LMArena text1350−0 in 30 days
Rank#210/351
95% interval1343–1358
Votes6.3K
- Developer
- StepFun
- Released
- Aug 14, 2025
- Context window
- —
- Price in / out, per 1M tokens
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- Weights
- Open · Apache 2.0
- Inputs
- —
- Reasoning
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- Tool use
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LatestStep-3 1350
The rating LMArena published at each update since Aug 14, 2025. Ratings move as votes come in and new models join.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1350 | 210 / 351 | 6.3K |
| CodingLMArena | 1367 | 211 / 346 | 1.2K |
| MathLMArena | 1367 | 200 / 339 | 349 |
| Creative writingLMArena | 1322 | 199 / 349 | 772 |
| Instruction followingLMArena | 1332 | 206 / 351 | 1.6K |
| Hard promptsLMArena | 1355 | 208 / 351 | 3K |
| Multi-turnLMArena | 1341 | 212 / 349 | 1K |
| Long queriesLMArena | 1325 | 222 / 330 | 1.3K |
| ExpertLMArena | 1333 | 216 / 305 | 265 |
| Legal and governmentIndustries | 1337 | 223 / 325 | 408 |
| Medicine and healthcareIndustries | 1362 | 200 / 325 | 349 |
| Business and financeIndustries | 1343 | 206 / 344 | 1.1K |
| ChineseLanguages | 1398 | 184 / 328 | 313 |
| SpanishLanguages | 1371 | 174 / 249 | 211 |
| GermanLanguages | 1371 | 155 / 261 | 153 |
| VisionLMArena | 1176 | 106 / 146 | 3.2K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare Step-3
StepFun
Builds the Step family of large multimodal models. Founded 2023, based in Shanghai. stepfun.com
Questions
Who makes Step-3?
Step-3 is made by StepFun, founded 2023 and based in Shanghai.
How does Step-3 rank?
#210 of 351 on LMArena’s text leaderboard, rated 1350 (95% interval 1343–1358) from 6,295 votes, as of Oct 22, 2026.
Is Step-3 open source?
Step-3 has open weights under the Apache 2.0 license.