# Kimi K2.5 vs Longcat Flash Chat

> Kimi K2.5 is the stronger model overall, scoring 47.8 to 41.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/kimi-k2-5-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Kimi K2.5 scores higher in 8 categories and Longcat Flash Chat in 0 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K2.5 leads 50.3 to 36.6.
- The biggest single-benchmark swing is NYT Connections (extended): 69.9% for Kimi K2.5 and 17.7% for Longcat Flash Chat.

## Snapshot

| | Kimi K2.5 | Longcat Flash Chat |
|---|---|---|
| Provider | Moonshot AI | Meituan |
| Noometry Index | 47.8 | 41.5 |
| Rank | 50 | 121 |
| Context | 262K | — |
| Input $/M | $0.45 | — |
| Output $/M | $2.25 | — |
| Weights | Open | Open |

## Coding

- Kimi K2.5: 48.7 (#48)
- Longcat Flash Chat: 42.9 (#85)

| Benchmark | Kimi K2.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1474 | 1471 |
| 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% | — |
| ALE-Bench | 821.65 | — |

## Agentic & Tool Use

- Kimi K2.5: 34.0 (#44)
- Longcat Flash Chat: —

| Benchmark | Kimi K2.5 | Longcat Flash Chat |
|---|---|---|
| Terminal-Bench | 43.2% | — |
| OSWorld | 63.3% | — |
| Vending-Bench 2 | 1,198 | — |

## Reasoning

- Kimi K2.5: 31.2 (#74)
- Longcat Flash Chat: 18.3 (#267)

| Benchmark | Kimi K2.5 | Longcat Flash Chat |
|---|---|---|
| Kagi LLM Benchmark | 78.5% | 43.9% |
| NYT Connections (extended) | 69.9% | 17.7% |
| LMArena Hard Prompts | 1454 | 1440 |
| ARC-AGI-2 | 11.8% | — |
| SimpleBench | 46.8% | — |
| ARC-AGI-1 | 65.3% | — |
| CritPt | 3.1% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 3.4% | — |
| Thematic Generalization | 69.4% | — |
| Epoch Capabilities Index | 148.05 | — |

## Math

- Kimi K2.5: 50.3 (#46)
- Longcat Flash Chat: 36.6 (#107)

| Benchmark | Kimi K2.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1470 | 1441 |
| MathArena Final-Answer Competitions | 62.3% | — |
| OTIS Mock AIME 2024-2025 | 92.2% | — |
| FrontierMath (Feb 2025 set) | 27.9% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Kimi K2.5: 53.6 (#52)
- Longcat Flash Chat: 40.0 (#111)

| Benchmark | Kimi K2.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1466 | 1454 |
| GPQA Diamond | 87.6% | — |
| Humanity's Last Exam | 24.4% | — |
| SimpleQA Verified | 34.3% | — |
| Vectara Hallucination Rate | 14.2% | — |

## Multimodal

- Kimi K2.5: 40.4 (#37)
- Longcat Flash Chat: —

| Benchmark | Kimi K2.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Vision | 1269 | — |
| LMArena Document | 1430 | — |

## Multilingual

- Kimi K2.5: 54.1 (#50)
- Longcat Flash Chat: 52.1 (#95)

| Benchmark | Kimi K2.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1433 | 1404 |
| LMArena Chinese | 1495 | 1465 |
| LMArena French | 1454 | 1457 |
| LMArena German | 1441 | 1409 |
| LMArena Japanese | 1422 | 1373 |
| LMArena Korean | 1412 | 1372 |
| LMArena Russian | 1436 | 1396 |
| LMArena Spanish | 1450 | 1445 |

## Instruction Following

- Kimi K2.5: 75.5 (#60)
- Longcat Flash Chat: 74.6 (#92)

| Benchmark | Kimi K2.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1431 | 1411 |

## Long Context

- Kimi K2.5: 52.1 (#7)
- Longcat Flash Chat: 43.5 (#89)

| Benchmark | Kimi K2.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1445 | 1425 |
| Fiction.LiveBench | 86.1% | — |
| CL-bench | 19.3% | — |
| CL-bench Life | 13.2% | — |

## Writing & Preference

- Kimi K2.5: 65.3 (#51)
- Longcat Flash Chat: 61.2 (#88)

| Benchmark | Kimi K2.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1445 | 1427 |
| LMArena Creative Writing | 1423 | 1388 |
| LMArena Multi-Turn | 1444 | 1418 |
| EQ-Bench Creative Writing | 1579 | — |

## FAQ

### Is Kimi K2.5 better than Longcat Flash Chat?

Kimi K2.5 is the stronger model overall, scoring 47.8 to 41.5 on the Noometry Index.

### Is Kimi K2.5 or Longcat Flash Chat better for coding?

Kimi K2.5 scores higher on coding benchmarks: 48.7 versus 42.9 in the Noometry coding category.

### How many benchmarks do Kimi K2.5 and Longcat Flash Chat share?

19 benchmarks have published results for both models. Kimi K2.5 has 51 scored results on Noometry and Longcat Flash Chat has 19.