StepFun Step 3.5 Flash vs Google Veo 3.1
Which one should you pick? Here's the full breakdown.
StepFun Step 3.5 Flash
StepFun's (China) agent-focused open-weight model -- Step 3.5 Flash launched 2026-02-01. 196B sparse MoE, ~11B active. Benchmarks slightly ahead of DeepSeek V3.2 at over 3x smaller total size. Step 3 (321B / 38B active, Apache 2.0) and Step3-VL-10B multimodal also in the family
Google Veo 3.1
Google's dominant AI video generator -- native 4K at 60fps with synchronized audio, now free to every Google account via Google Vids
| Category | StepFun Step 3.5 Flash | Google Veo 3.1 |
|---|---|---|
| Ease of Use | 6.0 | 7.5 |
| Output Quality | 8.0 | 9.5 |
| Value | 9.0 | 6.5 |
| Features | 8.0 | 8.0 |
| Overall | 7.8 | 7.9 |
Pricing Comparison
| Feature | StepFun Step 3.5 Flash | Google Veo 3.1 |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Which Should You Pick?
Pick StepFun Step 3.5 Flash if...
- ✓Better value for money (9/10)
Teams building agent systems on Chinese open-weight foundations who want something other than DeepSeek or Qwen, especially if agentic tool-use is the primary workload. Also good for Chinese-market products where StepFun's domestic tuning advantages matter. And for anyone looking to add diversity to their open-weight evaluation matrix beyond the top-3 Chinese labs.
Visit StepFun Step 3.5 FlashPick Google Veo 3.1 if...
- ✓Higher output quality (9.5 vs 8)
- ✓Easier to use (7.5 vs 6)
Creators who need the highest-quality AI video available and want free or low-cost access. The April 2026 free rollout to every Google account via Google Vids makes Veo 3.1 the new default starting point for anyone trying AI video seriously. Professional production teams benefit from Ultra's unlimited generations.
Visit Google Veo 3.1Our Verdict
StepFun Step 3.5 Flash and Google Veo 3.1 are extremely close overall. Your choice comes down to specific needs -- StepFun Step 3.5 Flash is better for teams building agent systems on chinese open-weight foundations who want something other than deepseek or qwen, especially if agentic tool-use is the primary workload, while Google Veo 3.1 works best for creators who need the highest-quality ai video available and want free or low-cost access.