StepFun Step 3.5 Flash vs AIVA
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
AIVA
AI music composer specializing in orchestral and cinematic scores -- one of the oldest players in AI music
| Category | StepFun Step 3.5 Flash | AIVA |
|---|---|---|
| Ease of Use | 6.0 | 6.5 |
| Output Quality | 8.0 | 7.5 |
| Value | 9.0 | 6.0 |
| Features | 8.0 | 6.5 |
| Overall | 7.8 | 6.6 |
Pricing Comparison
| Feature | StepFun Step 3.5 Flash | AIVA |
|---|---|---|
| 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)
- ✓More features (8 vs 6.5)
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 AIVA if...
Indie filmmakers, game developers, and content creators who need orchestral or cinematic background music without hiring a composer or navigating stock music licensing.
Visit AIVAOur Verdict
StepFun Step 3.5 Flash is the clear winner here with 7.8/10 vs 6.6/10. AIVA isn't bad, but StepFun Step 3.5 Flash outperforms it across the board. Pick AIVA only if indie filmmakers, game developers, and content creators who need orchestral or cinematic background music without hiring a composer or navigating stock music licensing.