# DeepSeek-V2.5 (Sep 2024) vs Longcat Flash Chat

> Longcat Flash Chat is the stronger model overall, scoring 42.1 to 37.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/deepseek-v2-5-vs-longcat-flash-chat
- Last updated: 2026-10-11
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. DeepSeek-V2.5 (Sep 2024) scores higher in 1 category and Longcat Flash Chat in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where Longcat Flash Chat leads 43.5 to 31.7.

## Snapshot

| | DeepSeek-V2.5 (Sep 2024) | Longcat Flash Chat |
|---|---|---|
| Provider | DeepSeek | Meituan |
| Noometry Index | 37.6 | 42.1 |
| Rank | 200 | 120 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Open | Open |

## Coding

- DeepSeek-V2.5 (Sep 2024): 31.7 (#281)
- Longcat Flash Chat: 43.5 (#87)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1309 | 1471 |
| Aider Polyglot | 17.8% | — |
| BigCodeBench Instruct | 48.6% | — |
| BigCodeBench Complete | 53.2% | — |
| HumanEval+ | 83.5% | — |
| MBPP+ | 74.1% | — |

## Reasoning

- DeepSeek-V2.5 (Sep 2024): 25.6 (#145)
- Longcat Flash Chat: 19.0 (#272)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Longcat Flash Chat |
|---|---|---|
| LMArena Hard Prompts | 1289 | 1440 |
| Kagi LLM Benchmark | — | 43.9% |
| NYT Connections (extended) | — | 17.7% |

## Math

- DeepSeek-V2.5 (Sep 2024): 35.9 (#177)
- Longcat Flash Chat: 39.4 (#107)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1288 | 1442 |

## Knowledge

- DeepSeek-V2.5 (Sep 2024): 34.8 (#193)
- Longcat Flash Chat: 40.6 (#116)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1266 | 1454 |

## Multilingual

- DeepSeek-V2.5 (Sep 2024): 42.5 (#193)
- Longcat Flash Chat: 51.9 (#101)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1273 | 1404 |
| LMArena Chinese | 1318 | 1465 |
| LMArena French | 1289 | 1456 |
| LMArena German | 1258 | 1408 |
| LMArena Japanese | 1228 | 1373 |
| LMArena Korean | 1209 | 1371 |
| LMArena Russian | 1289 | 1395 |
| LMArena Spanish | 1248 | 1445 |

## Instruction Following

- DeepSeek-V2.5 (Sep 2024): 67.5 (#194)
- Longcat Flash Chat: 74.4 (#96)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1280 | 1411 |

## Long Context

- DeepSeek-V2.5 (Sep 2024): 39.5 (#174)
- Longcat Flash Chat: 43.5 (#93)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1301 | 1425 |

## Writing & Preference

- DeepSeek-V2.5 (Sep 2024): 49.8 (#187)
- Longcat Flash Chat: 61.0 (#91)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1294 | 1427 |
| LMArena Creative Writing | 1285 | 1388 |
| LMArena Multi-Turn | 1297 | 1418 |

## FAQ

### Is DeepSeek-V2.5 (Sep 2024) better than Longcat Flash Chat?

Longcat Flash Chat is the stronger model overall, scoring 42.1 to 37.6 on the Noometry Index.

### Is DeepSeek-V2.5 (Sep 2024) or Longcat Flash Chat better for coding?

Longcat Flash Chat scores higher on coding benchmarks: 43.5 versus 31.7 in the Noometry coding category.

### How many benchmarks do DeepSeek-V2.5 (Sep 2024) and Longcat Flash Chat share?

17 benchmarks have published results for both models. DeepSeek-V2.5 (Sep 2024) has 22 scored results on Noometry and Longcat Flash Chat has 19.