# Longcat Flash Chat vs Qwen3.5 Plus

> Longcat Flash Chat and Qwen3.5 Plus score almost the same on the Noometry Index (42.1 vs 42.9), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/longcat-flash-chat-vs-qwen3-5-plus
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where Qwen3.5 Plus leads 32.8 to 19.0.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | Longcat Flash Chat | Qwen3.5 Plus |
|---|---|---|
| Provider | Meituan | Alibaba (Qwen) |
| Noometry Index | 42.1 | 42.9 |
| Rank | 120 | 106 |
| Context | — | 1M |
| Input $/M | — | $0.40 |
| Output $/M | — | $2.40 |
| Weights | Open | Proprietary |

## Coding

- Longcat Flash Chat: 43.5 (#87)
- Qwen3.5 Plus: —

| Benchmark | Longcat Flash Chat | Qwen3.5 Plus |
|---|---|---|
| LMArena Coding | 1471 | — |
| ALE-Bench | — | 621.92 |

## Agentic & Tool Use

- Longcat Flash Chat: —
- Qwen3.5 Plus: —

| Benchmark | Longcat Flash Chat | Qwen3.5 Plus |
|---|---|---|
| Vending-Bench 2 | — | 0.54 |

## Reasoning

- Longcat Flash Chat: 19.0 (#272)
- Qwen3.5 Plus: 32.8 (#74)

| Benchmark | Longcat Flash Chat | Qwen3.5 Plus |
|---|---|---|
| Kagi LLM Benchmark | 43.9% | — |
| NYT Connections (extended) | 17.7% | — |
| Chess Puzzles | — | 22% |
| LMArena Hard Prompts | 1440 | — |
| Mystery Game Puzzles | — | 17% |
| DTBench | — | 80.5% |
| LMCA | — | 36.4% |
| Epoch Capabilities Index | — | 146.78 |

## Math

- Longcat Flash Chat: 39.4 (#107)
- Qwen3.5 Plus: 49.6 (#61)

| Benchmark | Longcat Flash Chat | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 86.7% |
| LMArena Math | 1442 | — |
| FrontierMath (Feb 2025 set) | — | 21% |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- Longcat Flash Chat: 40.6 (#116)
- Qwen3.5 Plus: 46.0 (#83)

| Benchmark | Longcat Flash Chat | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | — | 84.8% |
| SimpleQA Verified | — | 25.4% |
| Vectara Hallucination Rate | — | 10.7% |
| LMArena Expert | 1454 | — |

## Multilingual

- Longcat Flash Chat: 51.9 (#101)
- Qwen3.5 Plus: —

| Benchmark | Longcat Flash Chat | Qwen3.5 Plus |
|---|---|---|
| LMArena Non-English | 1404 | — |
| LMArena Chinese | 1465 | — |
| LMArena French | 1456 | — |
| LMArena German | 1408 | — |
| LMArena Japanese | 1373 | — |
| LMArena Korean | 1371 | — |
| LMArena Russian | 1395 | — |
| LMArena Spanish | 1445 | — |

## Instruction Following

- Longcat Flash Chat: 74.4 (#96)
- Qwen3.5 Plus: —

| Benchmark | Longcat Flash Chat | Qwen3.5 Plus |
|---|---|---|
| LMArena Instruction Following | 1411 | — |

## Long Context

- Longcat Flash Chat: 43.5 (#93)
- Qwen3.5 Plus: 43.0 (#113)

| Benchmark | Longcat Flash Chat | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
| LMArena Longer Query | 1425 | — |

## Writing & Preference

- Longcat Flash Chat: 61.0 (#91)
- Qwen3.5 Plus: —

| Benchmark | Longcat Flash Chat | Qwen3.5 Plus |
|---|---|---|
| LMArena Text | 1427 | — |
| LMArena Creative Writing | 1388 | — |
| LMArena Multi-Turn | 1418 | — |

## FAQ

### Is Longcat Flash Chat better than Qwen3.5 Plus?

Longcat Flash Chat and Qwen3.5 Plus score almost the same on the Noometry Index (42.1 vs 42.9), so choose on price, context window or the category you care about most.

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

0 benchmarks have published results for both models. Longcat Flash Chat has 19 scored results on Noometry and Qwen3.5 Plus has 15.