StepFun Step 3.5 Flash vs GitHub Copilot
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
GitHub Copilot
AI code assistant that lives in your editor -- autocomplete on steroids
Powered by GPT-5.4
| Category | StepFun Step 3.5 Flash | GitHub Copilot |
|---|---|---|
| Ease of Use | 6.0 | 9.0 |
| Output Quality | 8.0 | 8.0 |
| Value | 9.0 | 8.0 |
| Features | 8.0 | 8.0 |
| Overall | 7.8 | 8.3 |
Pricing Comparison
| Feature | StepFun Step 3.5 Flash | GitHub Copilot |
|---|---|---|
| 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 GitHub Copilot if...
- ✓Easier to use (9 vs 6)
Any developer who wants productivity gains without changing their workflow. It works in your existing editor and the inline suggestions are the best in the business.
Visit GitHub CopilotOur Verdict
GitHub Copilot edges out StepFun Step 3.5 Flash with a 8.3 vs 7.8 overall score. Both are solid picks, but GitHub Copilot has the advantage in features.