# Longcat Flash Chat vs Mercury

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

- Canonical page: https://noometry.com/compare/longcat-flash-chat-vs-mercury
- Last updated: 2026-10-11
- Shared benchmarks: 9

## Summary

- They share 9 benchmarks with published results for both. Longcat Flash Chat scores higher in 6 categories and Mercury in 0 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Longcat Flash Chat leads 61.0 to 46.2.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 43.9% for Longcat Flash Chat and 21.6% for Mercury.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | Longcat Flash Chat | Mercury |
|---|---|---|
| Provider | Meituan | Inception |
| Noometry Index | 42.1 | 37.6 |
| Rank | 120 | 199 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Open | Proprietary |

## Coding

- Longcat Flash Chat: 43.5 (#87)
- Mercury: 38.7 (#170)

| Benchmark | Longcat Flash Chat | Mercury |
|---|---|---|
| LMArena Coding | 1471 | 1322 |

## Reasoning

- Longcat Flash Chat: 19.0 (#272)
- Mercury: 17.5 (#293)

| Benchmark | Longcat Flash Chat | Mercury |
|---|---|---|
| Kagi LLM Benchmark | 43.9% | 21.6% |
| LMArena Hard Prompts | 1440 | 1285 |
| NYT Connections (extended) | 17.7% | — |

## Math

- Longcat Flash Chat: 39.4 (#107)
- Mercury: —

| Benchmark | Longcat Flash Chat | Mercury |
|---|---|---|
| LMArena Math | 1442 | — |

## Knowledge

- Longcat Flash Chat: 40.6 (#116)
- Mercury: —

| Benchmark | Longcat Flash Chat | Mercury |
|---|---|---|
| LMArena Expert | 1454 | — |

## Multilingual

- Longcat Flash Chat: 51.9 (#101)
- Mercury: 41.6 (#206)

| Benchmark | Longcat Flash Chat | Mercury |
|---|---|---|
| LMArena Non-English | 1404 | 1260 |
| LMArena Chinese | 1465 | — |
| LMArena French | 1456 | — |
| LMArena German | 1408 | — |
| LMArena Japanese | 1373 | — |
| LMArena Korean | 1371 | — |
| LMArena Russian | 1395 | — |
| LMArena Spanish | 1445 | — |

## Instruction Following

- Longcat Flash Chat: 74.4 (#96)
- Mercury: 65.2 (#224)

| Benchmark | Longcat Flash Chat | Mercury |
|---|---|---|
| LMArena Instruction Following | 1411 | 1239 |

## Long Context

- Longcat Flash Chat: 43.5 (#93)
- Mercury: 38.4 (#198)

| Benchmark | Longcat Flash Chat | Mercury |
|---|---|---|
| LMArena Longer Query | 1425 | 1266 |

## Writing & Preference

- Longcat Flash Chat: 61.0 (#91)
- Mercury: 46.2 (#221)

| Benchmark | Longcat Flash Chat | Mercury |
|---|---|---|
| LMArena Text | 1427 | 1282 |
| LMArena Creative Writing | 1388 | 1191 |
| LMArena Multi-Turn | 1418 | 1282 |

## FAQ

### Is Longcat Flash Chat better than Mercury?

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

### Is Longcat Flash Chat or Mercury better for coding?

Longcat Flash Chat scores higher on coding benchmarks: 43.5 versus 38.7 in the Noometry coding category.

### How many benchmarks do Longcat Flash Chat and Mercury share?

9 benchmarks have published results for both models. Longcat Flash Chat has 19 scored results on Noometry and Mercury has 9.