Model comparison
Qwen3.5 Plus vs Step 3.7 Flash
Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 37.3 on the Noometry Index. Step 3.7 Flash costs 2.2× less per token, which makes it the better buy when Qwen3.5 Plus's lead doesn't matter for your workload.
Last verified . 1 shared benchmarks.
Alibaba (Qwen)
StepFunSummary
- They share 1 benchmark with published results for both. Qwen3.5 Plus scores higher in 2 categories and Step 3.7 Flash in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Qwen3.5 Plus leads 32.8 to 21.6.
- Step 3.7 Flash is cheaper at $0.18 / $1.11 per million input/output tokens, against $0.40 / $2.40 for Qwen3.5 Plus.
- Qwen3.5 Plus accepts more context: 1M tokens versus 256K.
- Step 3.7 Flash has downloadable open weights; the other is API-only.
Side by side
| Qwen3.5 Plus | Step 3.7 Flash | |
|---|---|---|
| Provider | Alibaba (Qwen) | StepFun |
| Noometry Index | 42.9 | 37.3 |
| Released | 2026-02-16 | 2026-05-29 |
| Weights | Proprietary | Open |
| Context window | 1M | 256K |
| Max output | 66K | 256K |
| Input $ / M tokens | $0.40 | $0.18 |
| Output $ / M tokens | $2.40 | $1.11 |
| Results tracked | 15 | 5 |
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Category by category
Coding Not comparable
Qwen3.5 Plus: —, Step 3.7 Flash: 40.0 (#150)
Agentic & Tool Use Not comparable
Qwen3.5 Plus: —, Step 3.7 Flash: —
| Benchmark | Qwen3.5 Plus | Step 3.7 Flash |
|---|---|---|
| Vending-Bench 2 | 0.54 | — |
Reasoning Qwen3.5 Plus leads
Qwen3.5 Plus: 32.8 (#74), Step 3.7 Flash: 21.6 (#219)
| Benchmark | Qwen3.5 Plus | Step 3.7 Flash |
|---|---|---|
| NYT Connections (extended) | — | 39.7% |
| CritPt | — | 2.3% |
| Chess Puzzles | 22% | — |
| Mystery Game Puzzles | 17% | — |
| DTBench | 80.5% | — |
| LMCA | 36.4% | — |
| Epoch Capabilities Index | 146.78 | — |
Math Qwen3.5 Plus leads
Qwen3.5 Plus: 49.6 (#61), Step 3.7 Flash: 42.9 (#82)
| Benchmark | Qwen3.5 Plus | Step 3.7 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | — | 68.5% |
| OTIS Mock AIME 2024-2025 | 86.7% | — |
| FrontierMath (Feb 2025 set) | 21% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |
Knowledge Not comparable
Qwen3.5 Plus: 46.0 (#83), Step 3.7 Flash: —
| Benchmark | Qwen3.5 Plus | Step 3.7 Flash |
|---|---|---|
| GPQA Diamond | 84.8% | — |
| SimpleQA Verified | 25.4% | — |
| Vectara Hallucination Rate | 10.7% | — |
Long Context Not comparable
Qwen3.5 Plus: 43.0 (#113), Step 3.7 Flash: —
| Benchmark | Qwen3.5 Plus | Step 3.7 Flash |
|---|---|---|
| CL-bench | 19.8% | — |
| CL-bench Life | 12.4% | — |
Frequently asked questions
Is Qwen3.5 Plus better than Step 3.7 Flash?
Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 37.3 on the Noometry Index. Step 3.7 Flash costs 2.2× less per token, which makes it the better buy when Qwen3.5 Plus's lead doesn't matter for your workload.
Which is cheaper, Qwen3.5 Plus or Step 3.7 Flash?
Step 3.7 Flash is cheaper. It lists at $0.18 per million input tokens and $1.11 per million output tokens; Qwen3.5 Plus lists at $0.40 and $2.40.
Which has the bigger context window?
Qwen3.5 Plus does, with 1M tokens against 256K.
How many benchmarks do Qwen3.5 Plus and Step 3.7 Flash share?
1 benchmark has published results for both models. Qwen3.5 Plus has 15 scored results on Noometry and Step 3.7 Flash has 5.