Qwen (Alibaba) vs StepFun Step 3.5 Flash
Which one should you pick? Here's the full breakdown.
Qwen (Alibaba)
Alibaba's open-weights + API family -- Qwen 3.6-Plus (Mar 30 2026, 1M context + always-on CoT + agentic tool-use), Qwen3.5 Small (2B runs on iPhone, 9B matches 120B-class models), plus Qwen3.5-Omni native multimodal. Apache 2.0 on the open sizes
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 | Qwen (Alibaba) | StepFun Step 3.5 Flash |
|---|---|---|
| Ease of Use | 7.0 | 6.0 |
| Output Quality | 9.0 | 8.0 |
| Value | 10.0 | 9.0 |
| Features | 9.0 | 8.0 |
| Overall | 8.8 | 7.8 |
Pricing Comparison
| Feature | Qwen (Alibaba) | StepFun Step 3.5 Flash |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Benchmark Head-to-Head
Qwen3.5-397B MoE benchmarks — StepFun Step 3.5 Flash has no published benchmarks
| Benchmark | Description | Score |
|---|---|---|
| MMLU-Pro | Harder multi-subject reasoning | 83.5% |
| GPQA Diamond | Graduate-level science questions | 78.2% |
| AIME 2025 | 87% | |
| HumanEval | Python code generation | 92.5% |
| SWE-Bench Verified | 69.4% |
Which Should You Pick?
Pick Qwen (Alibaba) if...
- ✓Higher output quality (9 vs 8)
- ✓Easier to use (7 vs 6)
- ✓Better value for money (10/10)
- ✓More features (9 vs 8)
Developers who want frontier-tier open weights with Apache 2.0 licensing. Qwen3-Coder-Next is arguably the best local coding model; Qwen3.5-397B is a top-3 open generalist.
Visit Qwen (Alibaba)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
Qwen (Alibaba) is the clear winner here with 8.8/10 vs 7.8/10. StepFun Step 3.5 Flash isn't bad, but Qwen (Alibaba) 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.