StepFun vs Z.ai
A side-by-side comparison of StepFun and Z.ai, two Assistant tools, drawn from Ignaite's continuously-verified listings.
Compared from listings verified as of
At a glance
| Attribute | StepFun | Z.ai |
|---|---|---|
| Category | Assistant | Assistant |
| Pricing | FREEMIUM | FREEMIUM |
| License | Proprietary | Proprietary |
| Deployment | Cloud | Cloud |
| Platforms | Web, API | Web, API |
| Model support | Single model (proprietary) | Single model (proprietary) |
| Vendor (differs) | StepFun | Z.ai (Zhipu AI) |
| Capabilities (differs) |
|
|
The honest brief
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
Z.ai
GLM-5 benchmarks near Claude Opus-class models at roughly 5–8x lower API price, and its weights are MIT-licensed for self-hosting.
- Free GLM-5 chat with reasoning modes
- OpenAI-compatible API for developers
- Agentic modes built in
- Trained without NVIDIA hardware
- China-hosted data concerns
- Younger international ecosystem
- English UX less polished than rivals
When to pick which
We found no distinguishing difference between StepFun and Z.ai on the signals we track — pricing, license, platforms, and model support. Their capability lists differ only in recorded depth — compare them above. Pick on team fit.