StepFun Step 3.5 Flash vs Perplexity AI
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
Perplexity AI
AI-powered search engine that gives cited answers instead of a list of links
| Category | StepFun Step 3.5 Flash | Perplexity AI |
|---|---|---|
| Ease of Use | 6.0 | 9.0 |
| Output Quality | 8.0 | 8.0 |
| Value | 9.0 | 9.0 |
| Features | 8.0 | 8.0 |
| Overall | 7.8 | 8.5 |
Pricing Comparison
| Feature | StepFun Step 3.5 Flash | Perplexity AI |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Which Should You Pick?
Pick StepFun Step 3.5 Flash if...
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 Perplexity AI if...
- ✓Easier to use (9 vs 6)
Researchers, students, professionals, and anyone who needs factual answers with sources. It's what Google should have become.
Visit Perplexity AIOur Verdict
Perplexity AI edges out StepFun Step 3.5 Flash with a 8.5 vs 7.8 overall score. Both are solid picks, but Perplexity AI has the advantage in features.