StepFun
Chinese AI lab building multimodal foundation models and an open API platform
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About
StepFun (阶跃星辰) develops large multimodal foundation models and offers them through its products and Open Platform API. In September 2026 it released Step 5 Preview, a sparse mixture-of-experts model with a large context window aimed at agentic coding, software engineering, and professional knowledge work, with open weights announced to follow.
- Website
- stepfun.com
- Added via
- web
- Ownership
- unclaimed
Where to go
Products
- StepFun Open Platform — API access to StepFun multimodal foundation models including Step 5 Preview · Api · Usage Based
Social profiles
Links
- Open Platformwebsite