Model comparison
Qwen1.5 4b Chat vs Qwen3.5 Plus
Qwen3.5 Plus is the stronger model overall, scoring 42.3 to 28.3 on the Noometry Index.
Last verified . 0 shared benchmarks.
Alibaba (Qwen)Summary
- The widest gap is in math, where Qwen3.5 Plus leads 47.9 to 27.9.
- Qwen1.5 4b Chat has downloadable open weights; the other is API-only.
Side by side
| Qwen1.5 4b Chat | Qwen3.5 Plus | |
|---|---|---|
| Provider | Alibaba (Qwen) | Alibaba (Qwen) |
| Noometry Index | 28.3 | 42.3 |
| Released | — | 2026-02-16 |
| Weights | Open | Proprietary |
| Context window | — | 1M |
| Max output | — | 66K |
| Input $ / M tokens | — | $0.40 |
| Output $ / M tokens | — | $2.40 |
| Results tracked | 13 | 15 |
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Category by category
Coding Not comparable
Qwen1.5 4b Chat: 28.6 (#305), Qwen3.5 Plus: —
| Benchmark | Qwen1.5 4b Chat | Qwen3.5 Plus |
|---|---|---|
| LMArena Coding | 999 | — |
| ALE-Bench | — | 621.92 |
Agentic & Tool Use Not comparable
Qwen1.5 4b Chat: —, Qwen3.5 Plus: —
| Benchmark | Qwen1.5 4b Chat | Qwen3.5 Plus |
|---|---|---|
| Vending-Bench 2 | — | 0.54 |
Reasoning Qwen3.5 Plus leads
Qwen1.5 4b Chat: 17.7 (#277), Qwen3.5 Plus: 32.0 (#67)
| Benchmark | Qwen1.5 4b Chat | Qwen3.5 Plus |
|---|---|---|
| Chess Puzzles | — | 22% |
| LMArena Hard Prompts | 976 | — |
| Mystery Game Puzzles | — | 17% |
| DTBench | — | 80.5% |
| LMCA | — | 36.4% |
| Epoch Capabilities Index | — | 146.79 |
Math Qwen3.5 Plus leads
Qwen1.5 4b Chat: 27.9 (#233), Qwen3.5 Plus: 47.9 (#55)
| Benchmark | Qwen1.5 4b Chat | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 86.7% |
| LMArena Math | 1026 | — |
| FrontierMath (Feb 2025 set) | — | 21% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge Qwen3.5 Plus leads
Qwen1.5 4b Chat: 26.2 (#252), Qwen3.5 Plus: 46.0 (#78)
| Benchmark | Qwen1.5 4b Chat | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | — | 84.8% |
| SimpleQA Verified | — | 25.4% |
| Vectara Hallucination Rate | — | 10.7% |
| LMArena Expert | 980 | — |
Multilingual Not comparable
Qwen1.5 4b Chat: 24.2 (#285), Qwen3.5 Plus: —
| Benchmark | Qwen1.5 4b Chat | Qwen3.5 Plus |
|---|---|---|
| LMArena Non-English | 979 | — |
| LMArena Chinese | 1024 | — |
| LMArena German | 902 | — |
| LMArena Russian | 952 | — |
Instruction Following Not comparable
Qwen1.5 4b Chat: 49.3 (#295), Qwen3.5 Plus: —
| Benchmark | Qwen1.5 4b Chat | Qwen3.5 Plus |
|---|---|---|
| LMArena Instruction Following | 979 | — |
Long Context Qwen3.5 Plus leads
Qwen1.5 4b Chat: 30.1 (#285), Qwen3.5 Plus: 42.9 (#109)
| Benchmark | Qwen1.5 4b Chat | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
| LMArena Longer Query | 988 | — |
Writing & Preference Not comparable
Qwen1.5 4b Chat: 23.9 (#304), Qwen3.5 Plus: —
| Benchmark | Qwen1.5 4b Chat | Qwen3.5 Plus |
|---|---|---|
| LMArena Text | 997 | — |
| LMArena Creative Writing | 969 | — |
| LMArena Multi-Turn | 977 | — |
Frequently asked questions
Is Qwen1.5 4b Chat better than Qwen3.5 Plus?
Qwen3.5 Plus is the stronger model overall, scoring 42.3 to 28.3 on the Noometry Index.
How many benchmarks do Qwen1.5 4b Chat and Qwen3.5 Plus share?
0 benchmarks have published results for both models. Qwen1.5 4b Chat has 13 scored results on Noometry and Qwen3.5 Plus has 15.