Kimi vs StepFun
A side-by-side comparison of Kimi and StepFun, two Assistant tools, drawn from Ignaite's continuously-verified listings.
Compared from listings verified as of
At a glance
| Attribute | Kimi | StepFun |
|---|---|---|
| Category | Assistant | Assistant |
| Pricing | FREEMIUM | FREEMIUM |
| License | Proprietary | Proprietary |
| Deployment | Cloud | Cloud |
| Platforms (differs) | Web, iOS, Android | Web, API |
| Model support | Single model (proprietary) | Single model (proprietary) |
| Vendor (differs) | Moonshot AI | StepFun |
| Capabilities (differs) |
|
|
The honest brief
Kimi
A polished consumer assistant whose underlying Kimi K2 model ships as open weights you can self-host.
- Built on open-weight Kimi K2 models
- Agent mode with parallel subagents
- Free tier available
- China-based, data-residency concerns
- English UX less polished than rivals
- Smaller ecosystem than ChatGPT/Gemini
- Availability varies by region
StepFun
Multimodal breadth is the differentiator — language, audio, image, and video models from one lab, pushed into cars and phones via device partnerships.
- Free multimodal chat
- Step-3.5-Flash is Apache 2.0
- Audio and image models on one API
- Tencent-backed, well-funded
- China-hosted data concerns
- English UX less polished than rivals
- Smaller ecosystem than peers
When to pick which
Across the signals we compare, Kimi and StepFun differ on platforms:
- Platforms
- Web, iOS, Android · Web, API
Their capability lists differ in recorded depth — compare the full lists above before deciding.