Pyyan / Compare / Step 3.5 Flash vs DeepSeek V4-Pro
Step 3.5 Flash vs DeepSeek V4-Pro
2 of 5Open-Weight Models · verified 13 Sept 2026
Step 3.5 FlashStepFuncurrentDeepSeek V4-ProDeepSeekcurrent
| Specification | Step 3.5 Flash | DeepSeek V4-Pro |
|---|---|---|
| Summary | Multimodal-focused Chinese model. | Best all-round open model of 2026. |
| Licence | Open weights | MIT |
| Category | Open-Weight Models | Open-Weight Models |
| Official | StepFun ↗ | DeepSeek ↗ |
Highlighted rows are where these differ.
DeepSeek V4-Pro
- Tops open leaderboards on agentic coding and reasoning
- MIT licence — no conditions
- Pioneered aggressive cache-hit pricing at ~$0.07/M
- DeepSeek routes all V4-Pro requests to V4.1 Flash from 14 September 2026
Best for everything open.