Model comparison
Kimi K3 vs Longcat Flash Chat
Kimi K3 is the stronger model overall, scoring 59.5 to 42.1 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Kimi K3 scores higher in 8 categories and Longcat Flash Chat in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K3 leads 63.0 to 19.0.
- The biggest single-benchmark swing is NYT Connections (extended): 93.6% for Kimi K3 and 17.7% for Longcat Flash Chat.
Side by side
| Kimi K3 | Longcat Flash Chat | |
|---|---|---|
| Provider | Moonshot AI | Meituan |
| Noometry Index | 59.5 | 42.1 |
| Released | 2026-07-16 | — |
| Weights | Open | Open |
| Context window | 1.05M | — |
| Max output | 1.05M | — |
| Input $ / M tokens | $3 | — |
| Output $ / M tokens | $15 | — |
| Results tracked | 53 | 19 |
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Category by category
Coding Kimi K3 leads
Kimi K3: 61.0 (#10), Longcat Flash Chat: 43.5 (#87)
| Benchmark | Kimi K3 | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1508 | 1471 |
| DeepSWE | 68.5% | — |
| FrontierCode | 44.2% | — |
| LMArena WebDev | 1654 | — |
| FrontierSWE | 25.9% | — |
| SciCode | 59.5% | — |
| WeirdML | 82.6% | — |
| ALE-Bench | 1,524 | — |
Agentic & Tool Use Not comparable
Kimi K3: 41.8 (#20), Longcat Flash Chat: —
| Benchmark | Kimi K3 | Longcat Flash Chat |
|---|---|---|
| APEX-Agents | 50.6% | — |
| τ²-bench Banking | 37.1% | — |
| PostTrainBench | 32% | — |
| GBAEval | 48.3% | — |
| GDP.pdf | 19% | — |
| Vending-Bench 2 | 5,165 | — |
Reasoning Kimi K3 leads
Kimi K3: 63.0 (#17), Longcat Flash Chat: 19.0 (#272)
| Benchmark | Kimi K3 | Longcat Flash Chat |
|---|---|---|
| NYT Connections (extended) | 93.6% | 17.7% |
| LMArena Hard Prompts | 1496 | 1440 |
| ARC-AGI-2 | 60.4% | — |
| SimpleBench | 60.7% | — |
| Kagi LLM Benchmark | — | 43.9% |
| ARC-AGI-1 | 94.5% | — |
| CritPt | 23.4% | — |
| Chess Puzzles | 39% | — |
| Mystery Game Puzzles | 26% | — |
| DTBench | 91.2% | — |
| LMCA | 52.7% | — |
| Surface Evolver Bench | 95% | — |
| Epoch Capabilities Index | 157.45 | — |
| ForecastBench | 61.1 | — |
Math Kimi K3 leads
Kimi K3: 74.2 (#16), Longcat Flash Chat: 39.4 (#107)
| Benchmark | Kimi K3 | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1491 | 1442 |
| FrontierMath (Tiers 1-3) | 72.2% | — |
| FrontierMath Tier 4 | 39% | — |
| MathArena Final-Answer Competitions | 87.8% | — |
| OTIS Mock AIME 2024-2025 | 97.2% | — |
| ProofBench | 87% | — |
Knowledge Kimi K3 leads
Kimi K3: 63.2 (#21), Longcat Flash Chat: 40.6 (#116)
| Benchmark | Kimi K3 | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1521 | 1454 |
| GPQA Diamond | 93.1% | — |
| SimpleQA Verified | 50.6% | — |
Multimodal Not comparable
Kimi K3: 37.8 (#70), Longcat Flash Chat: —
| Benchmark | Kimi K3 | Longcat Flash Chat |
|---|---|---|
| Blueprint-Bench 2 | 29.5% | — |
| Furniture Assembly | 34.2% | — |
Multilingual Kimi K3 leads
Kimi K3: 56.3 (#21), Longcat Flash Chat: 51.9 (#101)
| Benchmark | Kimi K3 | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1466 | 1404 |
| LMArena Chinese | 1529 | 1465 |
| LMArena French | 1491 | 1456 |
| LMArena German | 1488 | 1408 |
| LMArena Japanese | 1487 | 1373 |
| LMArena Korean | 1458 | 1371 |
| LMArena Russian | 1482 | 1395 |
| LMArena Spanish | 1472 | 1445 |
Instruction Following Kimi K3 leads
Kimi K3: 77.7 (#14), Longcat Flash Chat: 74.4 (#96)
| Benchmark | Kimi K3 | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1483 | 1411 |
Long Context Kimi K3 leads
Kimi K3: 45.8 (#29), Longcat Flash Chat: 43.5 (#93)
| Benchmark | Kimi K3 | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1494 | 1425 |
Writing & Preference Kimi K3 leads
Kimi K3: 76.6 (#4), Longcat Flash Chat: 61.0 (#91)
| Benchmark | Kimi K3 | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1476 | 1427 |
| LMArena Creative Writing | 1454 | 1388 |
| LMArena Multi-Turn | 1488 | 1418 |
| EQ-Bench Creative Writing | 2082 | — |
| EQ-Bench 4 | 1339 | — |
Frequently asked questions
Is Kimi K3 better than Longcat Flash Chat?
Kimi K3 is the stronger model overall, scoring 59.5 to 42.1 on the Noometry Index.
Is Kimi K3 or Longcat Flash Chat better for coding?
Kimi K3 scores higher on coding benchmarks: 61.0 versus 43.5 in the Noometry coding category.
How many benchmarks do Kimi K3 and Longcat Flash Chat share?
18 benchmarks have published results for both models. Kimi K3 has 53 scored results on Noometry and Longcat Flash Chat has 19.