AI tools·Chat models·China
StepFun
Hardcore AI lab behind Step-1/Step-2 trillion-parameter MoE models and Yuewen productivity assistant.
9.2/ 10.0Editorial Rating
Editorial score based on public benchmarks and community feedback — not a third-party benchmark resultCompiled through 2026-09
- Vendor
- StepFun
- Started
- 2023
- China availability
- Works in ChinaDirectly reachable from mainland China
- Pricing tier
- Free tier
- Current flagship
- Step-2 Trillion-parameter MoE / Yuewen
- Website
- yuewen.cn
Evaluation, Pros & Cons
Editorial score based on public benchmarks and community feedback — not a third-party benchmark result
Key Advantages
- StepFun trillion-parameter Step-2 MoE; strong mathematical and long-context reasoning
- Yuewen provides structured long-form report generation and multimodal charts understanding
Limitations & Caveats
- Global developer ecosystem and third-party integrations are still expanding
Overview
Founded by Dr. Daxin Jiang (former Microsoft VP), StepFun focuses on foundational foundation models. Step-2 is among the earliest trillion-parameter MoE models in China, powering Yuewen for document synthesis and academic research.
Direction
Accelerating end-to-end multimodal MoE, automated research agents, and consumer hardware partnerships.
Version history
Jul 2024
LatestStep-2 Trillion MoE preview
Trillion-parameter MoE preview.
Mar 2024
Step-1V / Yuewen launch
100B multimodal and Yuewen launch.
Apr 2023
StepFun founded
Built proprietary training cluster.