# Qwen1.5-72B vs Qwen3.5 Plus

> Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 30.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/qwen1-5-72b-vs-qwen3-5-plus
- Last updated: 2026-10-12
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Qwen1.5-72B scores higher in 0 categories and Qwen3.5 Plus in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Qwen3.5 Plus leads 46.0 to 11.5.
- The biggest single-benchmark swing is GPQA Diamond: 28.8% for Qwen1.5-72B and 84.8% for Qwen3.5 Plus.
- Qwen1.5-72B has downloadable open weights; the other is API-only.

## Snapshot

| | Qwen1.5-72B | Qwen3.5 Plus |
|---|---|---|
| Provider | Alibaba (Qwen) | Alibaba (Qwen) |
| Noometry Index | 30.8 | 42.9 |
| Rank | 285 | 106 |
| Context | — | 1M |
| Input $/M | — | $0.40 |
| Output $/M | — | $2.40 |
| Weights | Open | Proprietary |

## Coding

- Qwen1.5-72B: 31.9 (#277)
- Qwen3.5 Plus: —

| Benchmark | Qwen1.5-72B | Qwen3.5 Plus |
|---|---|---|
| BigCodeBench Instruct | 33.2% | — |
| LMArena Coding | 1165 | — |
| BigCodeBench Complete | 40.3% | — |
| ALE-Bench | — | 621.92 |
| HumanEval+ | 59.1% | — |
| MBPP+ | 61.6% | — |

## Agentic & Tool Use

- Qwen1.5-72B: —
- Qwen3.5 Plus: —

| Benchmark | Qwen1.5-72B | Qwen3.5 Plus |
|---|---|---|
| Vending-Bench 2 | — | 0.54 |

## Reasoning

- Qwen1.5-72B: 22.2 (#203)
- Qwen3.5 Plus: 32.8 (#74)

| Benchmark | Qwen1.5-72B | Qwen3.5 Plus |
|---|---|---|
| Chess Puzzles | — | 22% |
| LMArena Hard Prompts | 1148 | — |
| Mystery Game Puzzles | — | 17% |
| DTBench | — | 80.5% |
| LMCA | — | 36.4% |
| Epoch Capabilities Index | — | 146.78 |

## Math

- Qwen1.5-72B: 33.2 (#205)
- Qwen3.5 Plus: 49.6 (#61)

| Benchmark | Qwen1.5-72B | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 86.7% |
| LMArena Math | 1164 | — |
| FrontierMath (Feb 2025 set) | — | 21% |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- Qwen1.5-72B: 11.5 (#300)
- Qwen3.5 Plus: 46.0 (#83)

| Benchmark | Qwen1.5-72B | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | 28.8% | 84.8% |
| SimpleQA Verified | — | 25.4% |
| Vectara Hallucination Rate | — | 10.7% |
| LMArena Expert | 1136 | — |

## Multilingual

- Qwen1.5-72B: 33.2 (#253)
- Qwen3.5 Plus: —

| Benchmark | Qwen1.5-72B | Qwen3.5 Plus |
|---|---|---|
| LMArena Non-English | 1135 | — |
| LMArena Chinese | 1186 | — |
| LMArena French | 1159 | — |
| LMArena German | 1084 | — |
| LMArena Japanese | 1061 | — |
| LMArena Korean | 1050 | — |
| LMArena Russian | 1104 | — |
| LMArena Spanish | 1110 | — |

## Instruction Following

- Qwen1.5-72B: 59.3 (#256)
- Qwen3.5 Plus: —

| Benchmark | Qwen1.5-72B | Qwen3.5 Plus |
|---|---|---|
| LMArena Instruction Following | 1141 | — |

## Long Context

- Qwen1.5-72B: 35.1 (#243)
- Qwen3.5 Plus: 43.0 (#113)

| Benchmark | Qwen1.5-72B | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
| LMArena Longer Query | 1157 | — |

## Writing & Preference

- Qwen1.5-72B: 37.3 (#258)
- Qwen3.5 Plus: —

| Benchmark | Qwen1.5-72B | Qwen3.5 Plus |
|---|---|---|
| LMArena Text | 1166 | — |
| LMArena Creative Writing | 1137 | — |
| LMArena Multi-Turn | 1160 | — |

## FAQ

### Is Qwen1.5-72B better than Qwen3.5 Plus?

Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 30.8 on the Noometry Index.

### How many benchmarks do Qwen1.5-72B and Qwen3.5 Plus share?

1 benchmark has published results for both models. Qwen1.5-72B has 22 scored results on Noometry and Qwen3.5 Plus has 15.