Model vendor
StepFun
StepFun (阶跃星辰) is a Chinese artificial intelligence company focused on developing large language models and multimodal AI systems.
Updated Aug 11, 2026. Data as of 2026-08-11
Models2
Versions3
Open defaults1
CountryCN
StepFun models
Default-version specifications and scored-version capability values are labeled separately.
| ST | Step-3.5-Flash | 60.4 | 40.0% | 256K | Open weights | Step-3.5-Flash | |
| ST | Step3-VL-10B | 43.6 | 40.0% | N/A | Closed weights | Step3-VL-10B |
StepFun capability scores
Each unique model uses its latest scored version.
StepFun Highlights
Leading StepFun models by score, price and context window.
Top scoreStep 3.5 Flash60.4 LLMBoardLowest official inputStep 3.5 Flash$0.10 / 1MLargest contextStep 3.5 Flash256K tokens
Open-weight defaults1of 2 models
What is StepFun?
Background and model catalog information for StepFun.
StepFun (阶跃星辰) is a Chinese artificial intelligence company focused on developing large language models and multimodal AI systems.
Model ownership is separate from API hosting. One model can be offered by multiple API providers with different prices.
- Vendor
- StepFun
- Models
- 2
- Versions
- 3
- Country
- CN
- Founded
- Not available
Catalog data as of 2026-08-11.
FAQ
Common questions about StepFun.
What is StepFun's highest-ranked model?
Step 3.5 Flash currently has the strongest LLMBoard score from this vendor.
How many StepFun models are tracked?
The catalog contains 2 independently selectable StepFun models and 3 versions.
Does StepFun host every listed model API?
Not necessarily. Vendor identifies the model developer; API providers are tracked separately.
Does StepFun publish open-weight models?
1 current default versions are marked as open weight.