Model comparison
Hy4 preview vs Longcat Flash Chat
Hy4 preview is the stronger model overall, scoring 45.3 to 42.1 on the Noometry Index.
Last verified . 1 shared benchmarks.
TencentSummary
- They share 1 benchmark with published results for both. Hy4 preview scores higher in 3 categories and Longcat Flash Chat in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where Hy4 preview leads 55.7 to 39.4.
- The biggest single-benchmark swing is NYT Connections (extended): 68.2% for Hy4 preview and 17.7% for Longcat Flash Chat.
Side by side
| Hy4 preview | Longcat Flash Chat | |
|---|---|---|
| Provider | Tencent | Meituan |
| Noometry Index | 45.3 | 42.1 |
| Released | 2026-08-28 | — |
| Weights | Open | Open |
| Context window | 1.05M | — |
| Max output | 64K | — |
| Input $ / M tokens | $0.83 | — |
| Output $ / M tokens | $2.50 | — |
| Results tracked | 3 | 19 |
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Category by category
Coding Hy4 preview leads
Hy4 preview: 51.6 (#38), Longcat Flash Chat: 43.5 (#87)
| Benchmark | Hy4 preview | Longcat Flash Chat |
|---|---|---|
| LMArena WebDev | 1632 | — |
| LMArena Coding | — | 1471 |
Reasoning Hy4 preview leads
Hy4 preview: 31.9 (#79), Longcat Flash Chat: 19.0 (#272)
| Benchmark | Hy4 preview | Longcat Flash Chat |
|---|---|---|
| NYT Connections (extended) | 68.2% | 17.7% |
| Kagi LLM Benchmark | — | 43.9% |
| LMArena Hard Prompts | — | 1440 |
Math Hy4 preview leads
Hy4 preview: 55.7 (#42), Longcat Flash Chat: 39.4 (#107)
| Benchmark | Hy4 preview | Longcat Flash Chat |
|---|---|---|
| ProofBench | 75% | — |
| LMArena Math | — | 1442 |
Knowledge Not comparable
Hy4 preview: —, Longcat Flash Chat: 40.6 (#116)
| Benchmark | Hy4 preview | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | — | 1454 |
Multilingual Not comparable
Hy4 preview: —, Longcat Flash Chat: 51.9 (#101)
| Benchmark | Hy4 preview | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | — | 1404 |
| LMArena Chinese | — | 1465 |
| LMArena French | — | 1456 |
| LMArena German | — | 1408 |
| LMArena Japanese | — | 1373 |
| LMArena Korean | — | 1371 |
| LMArena Russian | — | 1395 |
| LMArena Spanish | — | 1445 |
Instruction Following Not comparable
Hy4 preview: —, Longcat Flash Chat: 74.4 (#96)
| Benchmark | Hy4 preview | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | — | 1411 |
Long Context Not comparable
Hy4 preview: —, Longcat Flash Chat: 43.5 (#93)
| Benchmark | Hy4 preview | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | — | 1425 |
Writing & Preference Not comparable
Hy4 preview: —, Longcat Flash Chat: 61.0 (#91)
| Benchmark | Hy4 preview | Longcat Flash Chat |
|---|---|---|
| LMArena Text | — | 1427 |
| LMArena Creative Writing | — | 1388 |
| LMArena Multi-Turn | — | 1418 |
Frequently asked questions
Is Hy4 preview better than Longcat Flash Chat?
Hy4 preview is the stronger model overall, scoring 45.3 to 42.1 on the Noometry Index.
Is Hy4 preview or Longcat Flash Chat better for coding?
Hy4 preview scores higher on coding benchmarks: 51.6 versus 43.5 in the Noometry coding category.
How many benchmarks do Hy4 preview and Longcat Flash Chat share?
1 benchmark has published results for both models. Hy4 preview has 3 scored results on Noometry and Longcat Flash Chat has 19.