# Longcat Flash Chat vs Mercury 2

> Longcat Flash Chat is the stronger model overall, scoring 41.5 to 38.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/longcat-flash-chat-vs-mercury-2
- Last updated: 2026-10-10
- Shared benchmarks: 11

## Summary

- They share 11 benchmarks with published results for both. Longcat Flash Chat scores higher in 6 categories and Mercury 2 in 1 category; 7 gaps are clear of the uncertainty.
- The widest gap is in coding, where Longcat Flash Chat leads 42.9 to 33.2.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| Provider | Meituan | Inception |
| Noometry Index | 41.5 | 38.8 |
| Rank | 121 | 167 |
| Context | — | 128K |
| Input $/M | — | $0.25 |
| Output $/M | — | $0.75 |
| Weights | Open | Proprietary |

## Coding

- Longcat Flash Chat: 42.9 (#85)
- Mercury 2: 33.2 (#250)

| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Coding | 1471 | 1391 |
| LMArena WebDev | — | 1170 |
| SciCode | — | 38.7% |
| WeirdML | — | 43.2% |
| ALE-Bench | — | 785.58 |

## Reasoning

- Longcat Flash Chat: 18.3 (#267)
- Mercury 2: 23.0 (#170)

| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Hard Prompts | 1440 | 1362 |
| Kagi LLM Benchmark | 43.9% | — |
| NYT Connections (extended) | 17.7% | — |
| CritPt | — | 0.8% |

## Math

- Longcat Flash Chat: 36.6 (#107)
- Mercury 2: —

| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Math | 1441 | — |

## Knowledge

- Longcat Flash Chat: 40.0 (#111)
- Mercury 2: 35.6 (#170)

| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Expert | 1454 | 1358 |
| Vectara Hallucination Rate | — | 12.3% |

## Multilingual

- Longcat Flash Chat: 52.1 (#95)
- Mercury 2: 46.8 (#153)

| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Non-English | 1404 | 1331 |
| LMArena Chinese | 1465 | 1416 |
| LMArena Russian | 1396 | 1303 |
| LMArena French | 1457 | — |
| LMArena German | 1409 | — |
| LMArena Japanese | 1373 | — |
| LMArena Korean | 1372 | — |
| LMArena Spanish | 1445 | — |

## Instruction Following

- Longcat Flash Chat: 74.6 (#92)
- Mercury 2: 70.4 (#161)

| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Instruction Following | 1411 | 1328 |

## Long Context

- Longcat Flash Chat: 43.5 (#89)
- Mercury 2: 40.4 (#149)

| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Longer Query | 1425 | 1329 |

## Writing & Preference

- Longcat Flash Chat: 61.2 (#88)
- Mercury 2: 54.0 (#151)

| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Text | 1427 | 1355 |
| LMArena Creative Writing | 1388 | 1289 |
| LMArena Multi-Turn | 1418 | 1358 |

## FAQ

### Is Longcat Flash Chat better than Mercury 2?

Longcat Flash Chat is the stronger model overall, scoring 41.5 to 38.8 on the Noometry Index.

### Is Longcat Flash Chat or Mercury 2 better for coding?

Longcat Flash Chat scores higher on coding benchmarks: 42.9 versus 33.2 in the Noometry coding category.

### How many benchmarks do Longcat Flash Chat and Mercury 2 share?

11 benchmarks have published results for both models. Longcat Flash Chat has 19 scored results on Noometry and Mercury 2 has 17.