# Kimi K2.5 Instant vs Longcat Flash Chat

> Kimi K2.5 Instant is the stronger model overall, scoring 42.9 to 41.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/kimi-k2-5-instant-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 16

## Summary

- They share 16 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 5 categories and Longcat Flash Chat in 3 categories; one gap is clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K2.5 Instant leads 28.5 to 18.3.

## Snapshot

| | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| Provider | Moonshot AI | Meituan |
| Noometry Index | 42.9 | 41.5 |
| Rank | 92 | 121 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Open | Open |

## Coding

- Kimi K2.5 Instant: 42.3 (#95)
- Longcat Flash Chat: 42.9 (#85)

| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1483 | 1471 |
| LMArena WebDev | 1404 | — |

## Reasoning

- Kimi K2.5 Instant: 28.5 (#88)
- Longcat Flash Chat: 18.3 (#267)

| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1440 |
| Kagi LLM Benchmark | — | 43.9% |
| NYT Connections (extended) | — | 17.7% |

## Math

- Kimi K2.5 Instant: 36.6 (#105)
- Longcat Flash Chat: 36.6 (#107)

| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1443 | 1441 |

## Knowledge

- Kimi K2.5 Instant: 39.5 (#121)
- Longcat Flash Chat: 40.0 (#111)

| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1438 | 1454 |

## Multimodal

- Kimi K2.5 Instant: 39.5 (#47)
- Longcat Flash Chat: —

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

## Multilingual

- Kimi K2.5 Instant: 52.2 (#89)
- Longcat Flash Chat: 52.1 (#95)

| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1406 | 1404 |
| LMArena Chinese | 1450 | 1465 |
| LMArena French | 1403 | 1457 |
| LMArena German | 1413 | 1409 |
| LMArena Korean | 1378 | 1372 |
| LMArena Russian | 1404 | 1396 |
| LMArena Spanish | 1448 | 1445 |
| LMArena Japanese | — | 1373 |

## Instruction Following

- Kimi K2.5 Instant: 75.5 (#61)
- Longcat Flash Chat: 74.6 (#92)

| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1430 | 1411 |

## Long Context

- Kimi K2.5 Instant: 43.8 (#82)
- Longcat Flash Chat: 43.5 (#89)

| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1435 | 1425 |

## Writing & Preference

- Kimi K2.5 Instant: 60.8 (#91)
- Longcat Flash Chat: 61.2 (#88)

| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1420 | 1427 |
| LMArena Creative Writing | 1379 | 1388 |
| LMArena Multi-Turn | 1427 | 1418 |

## FAQ

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

Kimi K2.5 Instant is the stronger model overall, scoring 42.9 to 41.5 on the Noometry Index.

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

They score almost the same on coding (42.3 vs 42.9); test both on your own repository before choosing.

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

16 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Longcat Flash Chat has 19.