# Qwen3.5-Flash vs Qwen3.5 Plus

> Qwen3.5-Flash and Qwen3.5 Plus score almost the same on the Noometry Index (42.5 vs 42.9), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/qwen3-5-flash-vs-qwen3-5-plus
- Last updated: 2026-10-12
- Shared benchmarks: 13

## Summary

- They share 13 benchmarks with published results for both. Qwen3.5-Flash scores higher in 1 category and Qwen3.5 Plus in 3 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in math, where Qwen3.5 Plus leads 49.6 to 37.4.
- The biggest single-benchmark swing is LMCA: 29.1% for Qwen3.5-Flash and 36.4% for Qwen3.5 Plus.
- Qwen3.5-Flash is cheaper at $0.10 / $0.40 per million input/output tokens, against $0.40 / $2.40 for Qwen3.5 Plus.

## Snapshot

| | Qwen3.5-Flash | Qwen3.5 Plus |
|---|---|---|
| Provider | Alibaba (Qwen) | Alibaba (Qwen) |
| Noometry Index | 42.5 | 42.9 |
| Rank | 112 | 106 |
| Context | 1M | 1M |
| Input $/M | $0.10 | $0.40 |
| Output $/M | $0.40 | $2.40 |
| Weights | Proprietary | Proprietary |

## Coding

- Qwen3.5-Flash: 34.2 (#242)
- Qwen3.5 Plus: —

| Benchmark | Qwen3.5-Flash | Qwen3.5 Plus |
|---|---|---|
| ALE-Bench | 221.8 | 621.92 |
| LMArena WebDev | 1244 | — |
| LMArena Coding | 1412 | — |

## Agentic & Tool Use

- Qwen3.5-Flash: —
- Qwen3.5 Plus: —

| Benchmark | Qwen3.5-Flash | Qwen3.5 Plus |
|---|---|---|
| Vending-Bench 2 | 462.69 | 0.54 |

## Reasoning

- Qwen3.5-Flash: 33.7 (#72)
- Qwen3.5 Plus: 32.8 (#74)

| Benchmark | Qwen3.5-Flash | Qwen3.5 Plus |
|---|---|---|
| Chess Puzzles | 21% | 22% |
| Mystery Game Puzzles | 20% | 17% |
| DTBench | 82.9% | 80.5% |
| LMCA | 29.1% | 36.4% |
| Epoch Capabilities Index | 143.98 | 146.78 |
| LMArena Hard Prompts | 1403 | — |

## Math

- Qwen3.5-Flash: 37.4 (#158)
- Qwen3.5 Plus: 49.6 (#61)

| Benchmark | Qwen3.5-Flash | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 84.4% | 86.7% |
| FrontierMath (Feb 2025 set) | 6.2% | 21% |
| FrontierMath Tier 4 (v1) | 0% | 2.1% |
| FrontierMath (Tiers 1-3) | 18.2% | — |
| LMArena Math | 1407 | — |

## Knowledge

- Qwen3.5-Flash: 43.2 (#93)
- Qwen3.5 Plus: 46.0 (#83)

| Benchmark | Qwen3.5-Flash | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | 82.3% | 84.8% |
| SimpleQA Verified | 20.3% | 25.4% |
| Vectara Hallucination Rate | 10.5% | 10.7% |
| LMArena Expert | 1407 | — |

## Multilingual

- Qwen3.5-Flash: 50.5 (#121)
- Qwen3.5 Plus: —

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

## Instruction Following

- Qwen3.5-Flash: 72.6 (#139)
- Qwen3.5 Plus: —

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

## Long Context

- Qwen3.5-Flash: 42.4 (#124)
- Qwen3.5 Plus: 43.0 (#113)

| Benchmark | Qwen3.5-Flash | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
| LMArena Longer Query | 1392 | — |

## Writing & Preference

- Qwen3.5-Flash: 57.9 (#122)
- Qwen3.5 Plus: —

| Benchmark | Qwen3.5-Flash | Qwen3.5 Plus |
|---|---|---|
| LMArena Text | 1397 | — |
| LMArena Creative Writing | 1343 | — |
| LMArena Multi-Turn | 1393 | — |

## FAQ

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

Qwen3.5-Flash and Qwen3.5 Plus score almost the same on the Noometry Index (42.5 vs 42.9), so choose on price, context window or the category you care about most.

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

Qwen3.5-Flash is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; Qwen3.5 Plus lists at $0.40 and $2.40.

### Which has the bigger context window?

Both accept 1M tokens.

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

13 benchmarks have published results for both models. Qwen3.5-Flash has 32 scored results on Noometry and Qwen3.5 Plus has 15.