Model comparison
Longcat Flash Chat vs Mercury 2
Longcat Flash Chat is the stronger model overall, scoring 42.1 to 39.1 on the Noometry Index.
Last verified . 11 shared benchmarks.
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 43.5 to 33.5.
- Longcat Flash Chat has downloadable open weights; the other is API-only.
Side by side
| Longcat Flash Chat | Mercury 2 | |
|---|---|---|
| Provider | Meituan | Inception |
| Noometry Index | 42.1 | 39.1 |
| Released | — | 2026-02-20 |
| Weights | Open | Proprietary |
| Context window | — | 128K |
| Max output | — | 50K |
| Input $ / M tokens | — | $0.25 |
| Output $ / M tokens | — | $0.75 |
| Results tracked | 19 | 17 |
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Category by category
Coding Longcat Flash Chat leads
Longcat Flash Chat: 43.5 (#87), Mercury 2: 33.5 (#255)
| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Coding | 1471 | 1391 |
| LMArena WebDev | — | 1171 |
| SciCode | — | 38.7% |
| WeirdML | — | 43.2% |
| ALE-Bench | — | 785.58 |
Reasoning Mercury 2 leads
Longcat Flash Chat: 19.0 (#272), Mercury 2: 23.8 (#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 Not comparable
Longcat Flash Chat: 39.4 (#107), Mercury 2: —
| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Math | 1442 | — |
Knowledge Longcat Flash Chat leads
Longcat Flash Chat: 40.6 (#116), Mercury 2: 36.2 (#172)
| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Expert | 1454 | 1358 |
| Vectara Hallucination Rate | — | 12.3% |
Multilingual Longcat Flash Chat leads
Longcat Flash Chat: 51.9 (#101), Mercury 2: 46.6 (#157)
| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Non-English | 1404 | 1331 |
| LMArena Chinese | 1465 | 1417 |
| LMArena Russian | 1395 | 1304 |
| LMArena French | 1456 | — |
| LMArena German | 1408 | — |
| LMArena Japanese | 1373 | — |
| LMArena Korean | 1371 | — |
| LMArena Spanish | 1445 | — |
Instruction Following Longcat Flash Chat leads
Longcat Flash Chat: 74.4 (#96), Mercury 2: 70.2 (#165)
| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Instruction Following | 1411 | 1329 |
Long Context Longcat Flash Chat leads
Longcat Flash Chat: 43.5 (#93), Mercury 2: 40.5 (#154)
| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Longer Query | 1425 | 1330 |
Writing & Preference Longcat Flash Chat leads
Longcat Flash Chat: 61.0 (#91), Mercury 2: 53.8 (#155)
| Benchmark | Longcat Flash Chat | Mercury 2 |
|---|---|---|
| LMArena Text | 1427 | 1355 |
| LMArena Creative Writing | 1388 | 1289 |
| LMArena Multi-Turn | 1418 | 1358 |
Frequently asked questions
Is Longcat Flash Chat better than Mercury 2?
Longcat Flash Chat is the stronger model overall, scoring 42.1 to 39.1 on the Noometry Index.
Is Longcat Flash Chat or Mercury 2 better for coding?
Longcat Flash Chat scores higher on coding benchmarks: 43.5 versus 33.5 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.