Step (StepFun) series comparison
StepFun's Step family: focused on multimodality and very large-scale models.
All models
Step (StepFun) series comparison
StepFun's Step family: focused on multimodality and very large-scale models.
4 versions (sorted by capability)
| Version | Context | Input | Output | Reasoning | Code | Speed | Open source |
|---|---|---|---|---|---|---|---|
| Step-2 | — | — | — | ●●●○○ | ●●●○○ | ●●●○○ | Closed |
| Step-3 | — | — | — | ●●●●○ | ●●●○○ | ●●●●○ | Closed |
| Step-3.5-Flash | 256K | — | — | ●●●●○ | ●●●●○ | ●●●●● | Open |
| Step-3.7-Flash | — | — | — | ●●●●○ | ●●●●○ | ●●●●● | Open |
Step-2Step-2 by StepStar: a trillion-parameter LLM (2024), one of the representative domestic large models.Step-3Step-3 by StepFun: A large model released in 2025, focusing on multimodality and large-scale parameters.Step-3.5-FlashStep-3.5-Flash by Jieyue Xingchen: 196B-A11B MoE, 256K context, supports tool calling, open-source (Apache 2.0).Step-3.7-FlashStep-3.7-Flash by Jieyue Xingchen: The latest open-source (Apache 2.0) fast model in 2026.