StepFun Step 3.5 Flash vs Jasper
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
Jasper
AI writing platform built for marketing teams -- templates, brand voice, and campaign workflows
| Category | StepFun Step 3.5 Flash | Jasper |
|---|---|---|
| Ease of Use | 6.0 | 8.0 |
| Output Quality | 8.0 | 7.0 |
| Value | 9.0 | 5.0 |
| Features | 8.0 | 8.0 |
| Overall | 7.8 | 7.0 |
Pricing Comparison
| Feature | StepFun Step 3.5 Flash | Jasper |
|---|---|---|
| Free Tier | Yes | No |
| Starting Price | $0 | $49 |
Which Should You Pick?
Pick StepFun Step 3.5 Flash if...
- ✓Higher output quality (8 vs 7)
- ✓Better value for money (9/10)
- ✓Has a free tier
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 Jasper if...
- ✓Easier to use (8 vs 6)
Marketing teams at companies with budget who need collaboration features and brand consistency. The templates and workflow tools save time when you're producing lots of marketing content.
Visit JasperOur Verdict
StepFun Step 3.5 Flash edges out Jasper with a 7.8 vs 7.0 overall score. Both are solid picks, but StepFun Step 3.5 Flash has the advantage in output quality.