# Qwen Plus vs Qwen3.5-Flash

> Qwen3.5-Flash is the stronger model overall, scoring 42.5 to 37.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/qwen-plus-vs-qwen3-5-flash
- Last updated: 2026-10-11
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Qwen Plus scores higher in 1 category and Qwen3.5-Flash in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Qwen3.5-Flash leads 43.2 to 27.4.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 17.8% for Qwen Plus and 84.4% for Qwen3.5-Flash.
- Qwen3.5-Flash is cheaper at $0.10 / $0.40 per million input/output tokens, against $0.40 / $1.20 for Qwen Plus.

## Snapshot

| | Qwen Plus | Qwen3.5-Flash |
|---|---|---|
| Provider | Alibaba (Qwen) | Alibaba (Qwen) |
| Noometry Index | 37.1 | 42.5 |
| Rank | 210 | 112 |
| Context | 1M | 1M |
| Input $/M | $0.40 | $0.10 |
| Output $/M | $1.20 | $0.40 |
| Weights | Proprietary | Proprietary |

## Coding

- Qwen Plus: 38.9 (#167)
- Qwen3.5-Flash: 34.2 (#242)

| Benchmark | Qwen Plus | Qwen3.5-Flash |
|---|---|---|
| LMArena Coding | 1328 | 1412 |
| LMArena WebDev | — | 1244 |
| ALE-Bench | — | 221.8 |

## Agentic & Tool Use

- Qwen Plus: —
- Qwen3.5-Flash: —

| Benchmark | Qwen Plus | Qwen3.5-Flash |
|---|---|---|
| Vending-Bench 2 | — | 462.69 |

## Reasoning

- Qwen Plus: 28.4 (#107)
- Qwen3.5-Flash: 33.7 (#72)

| Benchmark | Qwen Plus | Qwen3.5-Flash |
|---|---|---|
| LMArena Hard Prompts | 1317 | 1403 |
| DTBench | 81.1% | 82.9% |
| LMCA | 24% | 29.1% |
| Kagi LLM Benchmark | 63.3% | — |
| Chess Puzzles | — | 21% |
| Mystery Game Puzzles | — | 20% |
| Epoch Capabilities Index | — | 143.98 |

## Math

- Qwen Plus: 23.3 (#271)
- Qwen3.5-Flash: 37.4 (#158)

| Benchmark | Qwen Plus | Qwen3.5-Flash |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 17.8% | 84.4% |
| LMArena Math | 1326 | 1407 |
| FrontierMath (Feb 2025 set) | 1.7% | 6.2% |
| FrontierMath (Tiers 1-3) | — | 18.2% |
| MATH Level 5 | 65.3% | — |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- Qwen Plus: 27.4 (#251)
- Qwen3.5-Flash: 43.2 (#93)

| Benchmark | Qwen Plus | Qwen3.5-Flash |
|---|---|---|
| GPQA Diamond | 48.1% | 82.3% |
| LMArena Expert | 1328 | 1407 |
| SimpleQA Verified | — | 20.3% |
| Vectara Hallucination Rate | — | 10.5% |

## Multilingual

- Qwen Plus: 45.1 (#175)
- Qwen3.5-Flash: 50.5 (#121)

| Benchmark | Qwen Plus | Qwen3.5-Flash |
|---|---|---|
| LMArena Non-English | 1310 | 1385 |
| LMArena Chinese | 1347 | 1446 |
| LMArena Japanese | 1251 | 1368 |
| LMArena Russian | 1323 | 1379 |
| LMArena French | — | 1412 |
| LMArena German | — | 1390 |
| LMArena Korean | — | 1344 |
| LMArena Spanish | — | 1400 |

## Instruction Following

- Qwen Plus: 68.8 (#181)
- Qwen3.5-Flash: 72.6 (#139)

| Benchmark | Qwen Plus | Qwen3.5-Flash |
|---|---|---|
| LMArena Instruction Following | 1303 | 1374 |

## Long Context

- Qwen Plus: 40.3 (#158)
- Qwen3.5-Flash: 42.4 (#124)

| Benchmark | Qwen Plus | Qwen3.5-Flash |
|---|---|---|
| LMArena Longer Query | 1324 | 1392 |

## Writing & Preference

- Qwen Plus: 52.2 (#176)
- Qwen3.5-Flash: 57.9 (#122)

| Benchmark | Qwen Plus | Qwen3.5-Flash |
|---|---|---|
| LMArena Text | 1326 | 1397 |
| LMArena Creative Writing | 1293 | 1343 |
| LMArena Multi-Turn | 1336 | 1393 |

## FAQ

### Is Qwen Plus better than Qwen3.5-Flash?

Qwen3.5-Flash is the stronger model overall, scoring 42.5 to 37.1 on the Noometry Index.

### Which is cheaper, Qwen Plus or Qwen3.5-Flash?

Qwen3.5-Flash is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; Qwen Plus lists at $0.40 and $1.20.

### Is Qwen Plus or Qwen3.5-Flash better for coding?

Qwen Plus scores higher on coding benchmarks: 38.9 versus 34.2 in the Noometry coding category.

### Which has the bigger context window?

Both accept 1M tokens.

### How many benchmarks do Qwen Plus and Qwen3.5-Flash share?

18 benchmarks have published results for both models. Qwen Plus has 20 scored results on Noometry and Qwen3.5-Flash has 32.