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 10, 2026. Data as of 2026-08-07
Published models2
Published versions4
Open defaults1
CountryCN
StepFun models
Default-version specifications and scored-version capability values are labeled separately.
| ST | Step-3.5-Flash | N/A | N/A | 256K | Open weights | Not scored | |
| ST | Step3-VL-10B | N/A | N/A | N/A | Closed weights | Not scored |
StepFun capability scores
Each unique model uses its latest scored version.
No vendor score
None of this vendor's published models currently has a calculated LLMBoard score.
StepFun highlights
Leaders from this vendor's current published catalog.
Largest contextStep 3.5 Flash256K tokens
Open-weight defaults1of 2 published models
What is StepFun?
Vendor context from the published model registry.
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
- Published models
- 2
- Published versions
- 4
- Country
- CN
- Founded
- Not published
Vendor description and inventory come from the published model registry.
FAQ
Common questions about StepFun.
What is StepFun's highest-ranked model?
No model from this vendor currently has a published score.
How many StepFun models are tracked?
The current public catalog contains 2 independently selectable StepFun model products and 4 published 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.