# Kimi K2.5 vs Qwen3.5 Plus

> Kimi K2.5 is the stronger model overall, scoring 47.8 to 42.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/kimi-k2-5-vs-qwen3-5-plus
- Last updated: 2026-10-10
- Shared benchmarks: 12

## Summary

- They share 12 benchmarks with published results for both. Kimi K2.5 scores higher in 3 categories and Qwen3.5 Plus in 1 category; 3 gaps are clear of the uncertainty.
- The widest gap is in long context, where Kimi K2.5 leads 52.1 to 42.9.
- The biggest single-benchmark swing is Chess Puzzles: 12% for Kimi K2.5 and 22% for Qwen3.5 Plus.
- Both cost about the same: $0.45 input and $2.25 output per million tokens.
- Qwen3.5 Plus accepts more context: 1M tokens versus 262K.
- Kimi K2.5 has downloadable open weights; the other is API-only.

## Snapshot

| | Kimi K2.5 | Qwen3.5 Plus |
|---|---|---|
| Provider | Moonshot AI | Alibaba (Qwen) |
| Noometry Index | 47.8 | 42.3 |
| Rank | 50 | 103 |
| Context | 262K | 1M |
| Input $/M | $0.45 | $0.40 |
| Output $/M | $2.25 | $2.40 |
| Weights | Open | Proprietary |

## Coding

- Kimi K2.5: 48.7 (#48)
- Qwen3.5 Plus: —

| Benchmark | Kimi K2.5 | Qwen3.5 Plus |
|---|---|---|
| ALE-Bench | 821.65 | 621.92 |
| SWE-bench Verified | 73.8% | — |
| SWE-bench Verified (bash only) | 70.8% | — |
| LMArena WebDev | 1436 | — |
| SWE-bench Multilingual | 67.3% | — |
| SciCode | 49% | — |
| WeirdML | 45.6% | — |
| LMArena Coding | 1474 | — |

## Agentic & Tool Use

- Kimi K2.5: 34.0 (#44)
- Qwen3.5 Plus: —

| Benchmark | Kimi K2.5 | Qwen3.5 Plus |
|---|---|---|
| Vending-Bench 2 | 1,198 | 0.54 |
| Terminal-Bench | 43.2% | — |
| OSWorld | 63.3% | — |

## Reasoning

- Kimi K2.5: 31.2 (#74)
- Qwen3.5 Plus: 32.0 (#67)

| Benchmark | Kimi K2.5 | Qwen3.5 Plus |
|---|---|---|
| Chess Puzzles | 12% | 22% |
| Epoch Capabilities Index | 148.05 | 146.79 |
| ARC-AGI-2 | 11.8% | — |
| SimpleBench | 46.8% | — |
| Kagi LLM Benchmark | 78.5% | — |
| NYT Connections (extended) | 69.9% | — |
| ARC-AGI-1 | 65.3% | — |
| CritPt | 3.1% | — |
| EnigmaEval | 3.4% | — |
| Thematic Generalization | 69.4% | — |
| LMArena Hard Prompts | 1454 | — |
| Mystery Game Puzzles | — | 17% |
| DTBench | — | 80.5% |
| LMCA | — | 36.4% |

## Math

- Kimi K2.5: 50.3 (#46)
- Qwen3.5 Plus: 47.9 (#55)

| Benchmark | Kimi K2.5 | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 92.2% | 86.7% |
| FrontierMath (Feb 2025 set) | 27.9% | 21% |
| FrontierMath Tier 4 (v1) | 4.2% | 2.1% |
| MathArena Final-Answer Competitions | 62.3% | — |
| LMArena Math | 1470 | — |

## Knowledge

- Kimi K2.5: 53.6 (#52)
- Qwen3.5 Plus: 46.0 (#78)

| Benchmark | Kimi K2.5 | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | 87.6% | 84.8% |
| SimpleQA Verified | 34.3% | 25.4% |
| Vectara Hallucination Rate | 14.2% | 10.7% |
| Humanity's Last Exam | 24.4% | — |
| LMArena Expert | 1466 | — |

## Multimodal

- Kimi K2.5: 40.4 (#37)
- Qwen3.5 Plus: —

| Benchmark | Kimi K2.5 | Qwen3.5 Plus |
|---|---|---|
| LMArena Vision | 1269 | — |
| LMArena Document | 1430 | — |

## Multilingual

- Kimi K2.5: 54.1 (#50)
- Qwen3.5 Plus: —

| Benchmark | Kimi K2.5 | Qwen3.5 Plus |
|---|---|---|
| LMArena Non-English | 1433 | — |
| LMArena Chinese | 1495 | — |
| LMArena French | 1454 | — |
| LMArena German | 1441 | — |
| LMArena Japanese | 1422 | — |
| LMArena Korean | 1412 | — |
| LMArena Russian | 1436 | — |
| LMArena Spanish | 1450 | — |

## Instruction Following

- Kimi K2.5: 75.5 (#60)
- Qwen3.5 Plus: —

| Benchmark | Kimi K2.5 | Qwen3.5 Plus |
|---|---|---|
| LMArena Instruction Following | 1431 | — |

## Long Context

- Kimi K2.5: 52.1 (#7)
- Qwen3.5 Plus: 42.9 (#109)

| Benchmark | Kimi K2.5 | Qwen3.5 Plus |
|---|---|---|
| CL-bench | 19.3% | 19.8% |
| CL-bench Life | 13.2% | 12.4% |
| Fiction.LiveBench | 86.1% | — |
| LMArena Longer Query | 1445 | — |

## Writing & Preference

- Kimi K2.5: 65.3 (#51)
- Qwen3.5 Plus: —

| Benchmark | Kimi K2.5 | Qwen3.5 Plus |
|---|---|---|
| LMArena Text | 1445 | — |
| LMArena Creative Writing | 1423 | — |
| EQ-Bench Creative Writing | 1579 | — |
| LMArena Multi-Turn | 1444 | — |

## FAQ

### Is Kimi K2.5 better than Qwen3.5 Plus?

Kimi K2.5 is the stronger model overall, scoring 47.8 to 42.3 on the Noometry Index.

### Which is cheaper, Kimi K2.5 or Qwen3.5 Plus?

Qwen3.5 Plus is cheaper. It lists at $0.40 per million input tokens and $2.40 per million output tokens; Kimi K2.5 lists at $0.45 and $2.25.

### Which has the bigger context window?

Qwen3.5 Plus does, with 1M tokens against 262K.

### How many benchmarks do Kimi K2.5 and Qwen3.5 Plus share?

12 benchmarks have published results for both models. Kimi K2.5 has 51 scored results on Noometry and Qwen3.5 Plus has 15.