StepFun Step 3
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A to Z
- A · App
- No
- B · Built By
- StepFun
- C · CEO & Politics
- Jiang Daxin — Not publicly documented (PRC-based; operates under Chinese regulatory environment)
- D · Date
- 2025
- E · Expertise
- Intermediate+
- F · Free Tier
- Yes
- G · Generates
- Text only
- H · Deployment
- Cloud + Local (open weights)
- I · Inputs
- Text
- J · Jurisdiction
- China
- K · Key Staffers
- Jiang Daxin (Founder/CEO), StepFun team
- L · Languages
- Chinese-primary
- M · Model Type
- Reasoning LLM
- N · Safety Issues
- None reported
- O · Open Source
- Yes — open weights
- P · Pricing
- Free (open weights, Apache 2.0)
- Q · AIDb Rating
- 4/10 · AIDb v2.0 (rule-based): Capability 4/10 · Currency 4/10 · Access 2/10 · Significance 4/10 → 3.70
- R · What Makes It Special
- Multimodal reasoning mixture-of-experts with 321B total and 38B active parameters, co-designed (MFA attention, attention-FFN disaggregation) to cut decoding cost. Apache 2.0.
- S · Stock / Status
- Private
- T · Training Cutoff
- [UNKNOWN]
- U · Users
- [UNKNOWN]
- V · Voice Chat
- No
- W · Weights
- Downloadable
- X · X Handle
- @StepFun_AI
- Y · Year Founded
- [UNKNOWN]
- Z · Bottom Line
- Open-weights Reasoning LLM from StepFun, released 2025.
Data completeness 88% · Last verified 2026-06-11 · Primary source ↗
Cite this
“StepFun Step 3.” AIDb — The AI Database. Verified 2026-06-11. https://theaidatabase.com/m/stepfun-step-3.html