Model comparison
Kimi K2 (Jul 2025) vs Longcat Flash Chat
Kimi K2 (Jul 2025) and Longcat Flash Chat score almost the same on the Noometry Index (40.9 vs 41.5), so choose on price, context window or the category you care about most.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Kimi K2 (Jul 2025) scores higher in 4 categories and Longcat Flash Chat in 4 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K2 (Jul 2025) leads 22.7 to 18.3.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 64.4% for Kimi K2 (Jul 2025) and 43.9% for Longcat Flash Chat.
Side by side
| Kimi K2 (Jul 2025) | Longcat Flash Chat | |
|---|---|---|
| Provider | Moonshot AI | Meituan |
| Noometry Index | 40.9 | 41.5 |
| Released | 2025-07-12 | — |
| Weights | Open | Open |
| Context window | 262K | — |
| Max output | 262K | — |
| Input $ / M tokens | $0.57 | — |
| Output $ / M tokens | $2.30 | — |
| Results tracked | 42 | 19 |
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Category by category
Coding Too close to call
Kimi K2 (Jul 2025): 43.1 (#83), Longcat Flash Chat: 42.9 (#85)
| Benchmark | Kimi K2 (Jul 2025) | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1399 | 1471 |
| SWE-bench Verified (bash only) | 63.4% | — |
| Aider Polyglot | 59.1% | — |
| GSO | 4.9% | — |
| WeirdML | 42.8% | — |
| ALE-Bench | 597.5 | — |
Agentic & Tool Use Not comparable
Kimi K2 (Jul 2025): 32.2 (#59), Longcat Flash Chat: —
| Benchmark | Kimi K2 (Jul 2025) | Longcat Flash Chat |
|---|---|---|
| Terminal-Bench | 35.7% | — |
| Berkeley Function Calling Leaderboard | 59.1% | — |
| METR Time Horizons | 59.2% | — |
Reasoning Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 22.7 (#173), Longcat Flash Chat: 18.3 (#267)
| Benchmark | Kimi K2 (Jul 2025) | Longcat Flash Chat |
|---|---|---|
| Kagi LLM Benchmark | 64.4% | 43.9% |
| LMArena Hard Prompts | 1384 | 1440 |
| SimpleBench | 26.3% | — |
| NYT Connections (extended) | — | 17.7% |
| Epoch Capabilities Index | 146.02 | — |
| ForecastBench | 60.2 | — |
Math Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 40.1 (#81), Longcat Flash Chat: 36.6 (#107)
| Benchmark | Kimi K2 (Jul 2025) | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1396 | 1441 |
| Omni-MATH | 65.4% | — |
| FrontierMath (Feb 2025 set) | 21.4% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Longcat Flash Chat leads
Kimi K2 (Jul 2025): 36.9 (#153), Longcat Flash Chat: 40.0 (#111)
| Benchmark | Kimi K2 (Jul 2025) | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1363 | 1454 |
| MMLU-Pro | 81.9% | — |
| Confabulations | 20.4% | — |
| Vectara Hallucination Rate | 17.9% | — |
| GPQA (HELM) | 65.3% | — |
Multilingual Longcat Flash Chat leads
Kimi K2 (Jul 2025): 49.8 (#125), Longcat Flash Chat: 52.1 (#95)
| Benchmark | Kimi K2 (Jul 2025) | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1372 | 1404 |
| LMArena Chinese | 1416 | 1465 |
| LMArena French | 1379 | 1457 |
| LMArena German | 1386 | 1409 |
| LMArena Japanese | 1349 | 1373 |
| LMArena Korean | 1324 | 1372 |
| LMArena Russian | 1384 | 1396 |
| LMArena Spanish | 1383 | 1445 |
Instruction Following Longcat Flash Chat leads
Kimi K2 (Jul 2025): 71.3 (#151), Longcat Flash Chat: 74.6 (#92)
| Benchmark | Kimi K2 (Jul 2025) | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1347 | 1411 |
| IFEval | 85% | — |
Long Context Longcat Flash Chat leads
Kimi K2 (Jul 2025): 41.2 (#140), Longcat Flash Chat: 43.5 (#89)
| Benchmark | Kimi K2 (Jul 2025) | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1353 | 1425 |
| Fiction.LiveBench | 66.7% | — |
| CL-bench | 17.6% | — |
Writing & Preference Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 62.5 (#76), Longcat Flash Chat: 61.2 (#88)
| Benchmark | Kimi K2 (Jul 2025) | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1380 | 1427 |
| LMArena Creative Writing | 1349 | 1388 |
| LMArena Multi-Turn | 1371 | 1418 |
| Short-Story Creative Writing | 85.6% | — |
| EQ-Bench Creative Writing | 1666 | — |
| WildBench | 86.2% | — |
Frequently asked questions
Is Kimi K2 (Jul 2025) better than Longcat Flash Chat?
Kimi K2 (Jul 2025) and Longcat Flash Chat score almost the same on the Noometry Index (40.9 vs 41.5), so choose on price, context window or the category you care about most.
Is Kimi K2 (Jul 2025) or Longcat Flash Chat better for coding?
They score almost the same on coding (43.1 vs 42.9); test both on your own repository before choosing.
How many benchmarks do Kimi K2 (Jul 2025) and Longcat Flash Chat share?
18 benchmarks have published results for both models. Kimi K2 (Jul 2025) has 42 scored results on Noometry and Longcat Flash Chat has 19.