Nano Banana 2 (Gemini 3.1 Flash Image) vs StepFun Step 3.5 Flash
Which one should you pick? Here's the full breakdown.
Nano Banana 2 (Gemini 3.1 Flash Image)
Google's Gemini 3.1 Flash Image model -- the best-in-class text-in-image renderer, now the default across the Gemini app
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
| Category | Nano Banana 2 (Gemini 3.1 Flash Image) | StepFun Step 3.5 Flash |
|---|---|---|
| Ease of Use | 9.5 | 6.0 |
| Output Quality | 9.5 | 8.0 |
| Value | 8.5 | 9.0 |
| Features | 8.0 | 8.0 |
| Overall | 8.9 | 7.8 |
Pricing Comparison
| Feature | Nano Banana 2 (Gemini 3.1 Flash Image) | StepFun Step 3.5 Flash |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Which Should You Pick?
Pick Nano Banana 2 (Gemini 3.1 Flash Image) if...
- ✓Higher output quality (9.5 vs 8)
- ✓Easier to use (9.5 vs 6)
Designers, marketers, and content creators who need readable text in images (social posts, ad creative, book covers, infographics, event flyers) and who are already using or willing to pay for Gemini. If any part of your commercial design work requires typography to look right, Nano Banana 2 is the 2026 leader.
Visit Nano Banana 2 (Gemini 3.1 Flash Image)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 FlashOur Verdict
Nano Banana 2 (Gemini 3.1 Flash Image) is the clear winner here with 8.9/10 vs 7.8/10. StepFun Step 3.5 Flash isn't bad, but Nano Banana 2 (Gemini 3.1 Flash Image) outperforms it across the board. Pick StepFun Step 3.5 Flash only 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.