Model comparison
Qwen1.5 4b Chat vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 43.8 to 28.3 on the Noometry Index.
Last verified . 0 shared benchmarks.
Alibaba (Qwen)
StepFunSummary
- The widest gap is in coding, where Step 5 Preview leads 50.6 to 28.6.
- Qwen1.5 4b Chat has downloadable open weights; the other is API-only.
Side by side
| Qwen1.5 4b Chat | Step 5 Preview | |
|---|---|---|
| Provider | Alibaba (Qwen) | StepFun |
| Noometry Index | 28.3 | 43.8 |
| Released | — | 2026-09-16 |
| Weights | Open | Proprietary |
| Context window | — | 1.02M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1 |
| Output $ / M tokens | — | $2.70 |
| Results tracked | 13 | 3 |
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Category by category
Coding Step 5 Preview leads
Qwen1.5 4b Chat: 28.6 (#305), Step 5 Preview: 50.6 (#40)
| Benchmark | Qwen1.5 4b Chat | Step 5 Preview |
|---|---|---|
| LMArena WebDev | — | 1569 |
| SciCode | — | 58.9% |
| LMArena Coding | 999 | — |
Reasoning Step 5 Preview leads
Qwen1.5 4b Chat: 17.7 (#277), Step 5 Preview: 38.0 (#58)
| Benchmark | Qwen1.5 4b Chat | Step 5 Preview |
|---|---|---|
| CritPt | — | 20.9% |
| LMArena Hard Prompts | 976 | — |
Math Not comparable
Qwen1.5 4b Chat: 27.9 (#233), Step 5 Preview: —
| Benchmark | Qwen1.5 4b Chat | Step 5 Preview |
|---|---|---|
| LMArena Math | 1026 | — |
Knowledge Not comparable
Qwen1.5 4b Chat: 26.2 (#252), Step 5 Preview: —
| Benchmark | Qwen1.5 4b Chat | Step 5 Preview |
|---|---|---|
| LMArena Expert | 980 | — |
Multilingual Not comparable
Qwen1.5 4b Chat: 24.2 (#285), Step 5 Preview: —
| Benchmark | Qwen1.5 4b Chat | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 979 | — |
| LMArena Chinese | 1024 | — |
| LMArena German | 902 | — |
| LMArena Russian | 952 | — |
Instruction Following Not comparable
Qwen1.5 4b Chat: 49.3 (#295), Step 5 Preview: —
| Benchmark | Qwen1.5 4b Chat | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 979 | — |
Long Context Not comparable
Qwen1.5 4b Chat: 30.1 (#285), Step 5 Preview: —
| Benchmark | Qwen1.5 4b Chat | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 988 | — |
Writing & Preference Not comparable
Qwen1.5 4b Chat: 23.9 (#304), Step 5 Preview: —
| Benchmark | Qwen1.5 4b Chat | Step 5 Preview |
|---|---|---|
| LMArena Text | 997 | — |
| LMArena Creative Writing | 969 | — |
| LMArena Multi-Turn | 977 | — |
Frequently asked questions
Is Qwen1.5 4b Chat better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 43.8 to 28.3 on the Noometry Index.
Is Qwen1.5 4b Chat or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 50.6 versus 28.6 in the Noometry coding category.
How many benchmarks do Qwen1.5 4b Chat and Step 5 Preview share?
0 benchmarks have published results for both models. Qwen1.5 4b Chat has 13 scored results on Noometry and Step 5 Preview has 3.