# Kimi K2.5 Instant vs Qwen3.5-Flash

> Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 42.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/kimi-k2-5-instant-vs-qwen3-5-flash
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 6 categories and Qwen3.5-Flash in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where Kimi K2.5 Instant leads 42.6 to 34.2.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.

## Snapshot

| | Kimi K2.5 Instant | Qwen3.5-Flash |
|---|---|---|
| Provider | Moonshot AI | Alibaba (Qwen) |
| Noometry Index | 43.6 | 42.5 |
| Rank | 89 | 112 |
| Context | — | 1M |
| Input $/M | — | $0.10 |
| Output $/M | — | $0.40 |
| Weights | Open | Proprietary |

## Coding

- Kimi K2.5 Instant: 42.6 (#97)
- Qwen3.5-Flash: 34.2 (#242)

| Benchmark | Kimi K2.5 Instant | Qwen3.5-Flash |
|---|---|---|
| LMArena WebDev | 1404 | 1244 |
| LMArena Coding | 1484 | 1412 |
| ALE-Bench | — | 221.8 |

## Agentic & Tool Use

- Kimi K2.5 Instant: —
- Qwen3.5-Flash: —

| Benchmark | Kimi K2.5 Instant | Qwen3.5-Flash |
|---|---|---|
| Vending-Bench 2 | — | 462.69 |

## Reasoning

- Kimi K2.5 Instant: 29.7 (#90)
- Qwen3.5-Flash: 33.7 (#72)

| Benchmark | Kimi K2.5 Instant | Qwen3.5-Flash |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1403 |
| Chess Puzzles | — | 21% |
| Mystery Game Puzzles | — | 20% |
| DTBench | — | 82.9% |
| LMCA | — | 29.1% |
| Epoch Capabilities Index | — | 143.98 |

## Math

- Kimi K2.5 Instant: 39.4 (#105)
- Qwen3.5-Flash: 37.4 (#158)

| Benchmark | Kimi K2.5 Instant | Qwen3.5-Flash |
|---|---|---|
| LMArena Math | 1442 | 1407 |
| FrontierMath (Tiers 1-3) | — | 18.2% |
| OTIS Mock AIME 2024-2025 | — | 84.4% |
| FrontierMath (Feb 2025 set) | — | 6.2% |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- Kimi K2.5 Instant: 40.2 (#123)
- Qwen3.5-Flash: 43.2 (#93)

| Benchmark | Kimi K2.5 Instant | Qwen3.5-Flash |
|---|---|---|
| LMArena Expert | 1440 | 1407 |
| GPQA Diamond | — | 82.3% |
| SimpleQA Verified | — | 20.3% |
| Vectara Hallucination Rate | — | 10.5% |

## Multimodal

- Kimi K2.5 Instant: 40.2 (#50)
- Qwen3.5-Flash: —

| Benchmark | Kimi K2.5 Instant | Qwen3.5-Flash |
|---|---|---|
| LMArena Vision | 1254 | — |

## Multilingual

- Kimi K2.5 Instant: 52.0 (#94)
- Qwen3.5-Flash: 50.5 (#121)

| Benchmark | Kimi K2.5 Instant | Qwen3.5-Flash |
|---|---|---|
| LMArena Non-English | 1406 | 1385 |
| LMArena Chinese | 1449 | 1446 |
| LMArena French | 1403 | 1412 |
| LMArena German | 1413 | 1390 |
| LMArena Korean | 1378 | 1344 |
| LMArena Russian | 1404 | 1379 |
| LMArena Spanish | 1447 | 1400 |
| LMArena Japanese | — | 1368 |

## Instruction Following

- Kimi K2.5 Instant: 75.3 (#65)
- Qwen3.5-Flash: 72.6 (#139)

| Benchmark | Kimi K2.5 Instant | Qwen3.5-Flash |
|---|---|---|
| LMArena Instruction Following | 1430 | 1374 |

## Long Context

- Kimi K2.5 Instant: 43.9 (#83)
- Qwen3.5-Flash: 42.4 (#124)

| Benchmark | Kimi K2.5 Instant | Qwen3.5-Flash |
|---|---|---|
| LMArena Longer Query | 1435 | 1392 |

## Writing & Preference

- Kimi K2.5 Instant: 60.6 (#95)
- Qwen3.5-Flash: 57.9 (#122)

| Benchmark | Kimi K2.5 Instant | Qwen3.5-Flash |
|---|---|---|
| LMArena Text | 1420 | 1397 |
| LMArena Creative Writing | 1381 | 1343 |
| LMArena Multi-Turn | 1427 | 1393 |

## FAQ

### Is Kimi K2.5 Instant better than Qwen3.5-Flash?

Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 42.5 on the Noometry Index.

### Is Kimi K2.5 Instant or Qwen3.5-Flash better for coding?

Kimi K2.5 Instant scores higher on coding benchmarks: 42.6 versus 34.2 in the Noometry coding category.

### How many benchmarks do Kimi K2.5 Instant and Qwen3.5-Flash share?

17 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Qwen3.5-Flash has 32.