Model comparison
Kimi K2.5 Instant vs Longcat Flash Chat
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 42.1 on the Noometry Index.
Last verified . 16 shared benchmarks.
Summary
- They share 16 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 5 categories and Longcat Flash Chat in 3 categories; one gap is clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K2.5 Instant leads 29.7 to 19.0.
Side by side
| Kimi K2.5 Instant | Longcat Flash Chat | |
|---|---|---|
| Provider | Moonshot AI | Meituan |
| Noometry Index | 43.6 | 42.1 |
| Released | — | — |
| Weights | Open | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 18 | 19 |
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Category by category
Coding Too close to call
Kimi K2.5 Instant: 42.6 (#97), Longcat Flash Chat: 43.5 (#87)
| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1484 | 1471 |
| LMArena WebDev | 1404 | — |
Reasoning Kimi K2.5 Instant leads
Kimi K2.5 Instant: 29.7 (#90), Longcat Flash Chat: 19.0 (#272)
| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1440 |
| Kagi LLM Benchmark | — | 43.9% |
| NYT Connections (extended) | — | 17.7% |
Math Too close to call
Kimi K2.5 Instant: 39.4 (#105), Longcat Flash Chat: 39.4 (#107)
| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1442 | 1442 |
Knowledge Too close to call
Kimi K2.5 Instant: 40.2 (#123), Longcat Flash Chat: 40.6 (#116)
| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1440 | 1454 |
Multimodal Not comparable
Kimi K2.5 Instant: 40.2 (#50), Longcat Flash Chat: —
| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Vision | 1254 | — |
Multilingual Too close to call
Kimi K2.5 Instant: 52.0 (#94), Longcat Flash Chat: 51.9 (#101)
| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1406 | 1404 |
| LMArena Chinese | 1449 | 1465 |
| LMArena French | 1403 | 1456 |
| LMArena German | 1413 | 1408 |
| LMArena Korean | 1378 | 1371 |
| LMArena Russian | 1404 | 1395 |
| LMArena Spanish | 1447 | 1445 |
| LMArena Japanese | — | 1373 |
Instruction Following Too close to call
Kimi K2.5 Instant: 75.3 (#65), Longcat Flash Chat: 74.4 (#96)
| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1430 | 1411 |
Long Context Too close to call
Kimi K2.5 Instant: 43.9 (#83), Longcat Flash Chat: 43.5 (#93)
| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1435 | 1425 |
Writing & Preference Too close to call
Kimi K2.5 Instant: 60.6 (#95), Longcat Flash Chat: 61.0 (#91)
| Benchmark | Kimi K2.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1420 | 1427 |
| LMArena Creative Writing | 1381 | 1388 |
| LMArena Multi-Turn | 1427 | 1418 |
Frequently asked questions
Is Kimi K2.5 Instant better than Longcat Flash Chat?
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 42.1 on the Noometry Index.
Is Kimi K2.5 Instant or Longcat Flash Chat better for coding?
They score almost the same on coding (42.6 vs 43.5); test both on your own repository before choosing.
How many benchmarks do Kimi K2.5 Instant and Longcat Flash Chat share?
16 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Longcat Flash Chat has 19.