Model comparison
Claude Opus 4.1 vs Longcat Flash Chat
Longcat Flash Chat is the stronger model overall, scoring 42.1 to 41.0 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. Claude Opus 4.1 scores higher in 7 categories and Longcat Flash Chat in 1 category; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where Longcat Flash Chat leads 39.4 to 22.3.
- Longcat Flash Chat has downloadable open weights; the other is API-only.
Side by side
| Claude Opus 4.1 | Longcat Flash Chat | |
|---|---|---|
| Provider | Anthropic | Meituan |
| Noometry Index | 41.0 | 42.1 |
| Released | 2025-08-05 | — |
| Weights | Proprietary | Open |
| Context window | 200K | — |
| Max output | 32K | — |
| Input $ / M tokens | $15 | — |
| Output $ / M tokens | $75 | — |
| Results tracked | 48 | 19 |
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Category by category
Coding Too close to call
Claude Opus 4.1: 44.4 (#73), Longcat Flash Chat: 43.5 (#87)
| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1479 | 1471 |
| SWE-bench Verified | 73.3% | — |
| LMArena WebDev | 1390 | — |
| WeirdML | 45.9% | — |
| ALE-Bench | 674.77 | — |
| AlgoTune | 1.34 | — |
Agentic & Tool Use Not comparable
Claude Opus 4.1: 35.0 (#41), Longcat Flash Chat: —
| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| Terminal-Bench | 38% | — |
| GDPval | 43.6% | — |
| Cybench | 42% | — |
| DeepResearch Bench | 48.3% | — |
| LMArena Search | 1148 | — |
| METR Time Horizons | 66.8% | — |
Reasoning Claude Opus 4.1 leads
Claude Opus 4.1: 32.2 (#76), Longcat Flash Chat: 19.0 (#272)
| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1440 |
| SimpleBench | 60% | — |
| Kagi LLM Benchmark | — | 43.9% |
| NYT Connections (extended) | — | 17.7% |
| Chess Puzzles | 7% | — |
| EnigmaEval | 7.2% | — |
| EBR-Bench | 7.9% | — |
| Mystery Game Puzzles | 21% | — |
| DTBench | 80% | — |
| LMCA | 37.1% | — |
| Epoch Capabilities Index | 144.12 | — |
| ForecastBench | 62 | — |
Math Longcat Flash Chat leads
Claude Opus 4.1: 22.3 (#277), Longcat Flash Chat: 39.4 (#107)
| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1431 | 1442 |
| FrontierMath (Tiers 1-3) | 12.6% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.9% | — |
| FrontierMath (Feb 2025 set) | 7.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Opus 4.1 leads
Claude Opus 4.1: 42.0 (#101), Longcat Flash Chat: 40.6 (#116)
| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1439 | 1454 |
| GPQA Diamond | 77.3% | — |
| Humanity's Last Exam | 11.5% | — |
| Confabulations | 17.1% | — |
| Vectara Hallucination Rate | 11.8% | — |
Multimodal Not comparable
Claude Opus 4.1: 26.8 (#119), Longcat Flash Chat: —
| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| VPCT | 35% | — |
Multilingual Too close to call
Claude Opus 4.1: 52.0 (#95), Longcat Flash Chat: 51.9 (#101)
| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1405 | 1404 |
| LMArena Chinese | 1427 | 1465 |
| LMArena French | 1431 | 1456 |
| LMArena German | 1413 | 1408 |
| LMArena Japanese | 1378 | 1373 |
| LMArena Korean | 1380 | 1371 |
| LMArena Russian | 1422 | 1395 |
| LMArena Spanish | 1448 | 1445 |
Instruction Following Claude Opus 4.1 leads
Claude Opus 4.1: 75.6 (#58), Longcat Flash Chat: 74.4 (#96)
| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1435 | 1411 |
Long Context Too close to call
Claude Opus 4.1: 44.5 (#63), Longcat Flash Chat: 43.5 (#93)
| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1455 | 1425 |
Writing & Preference Claude Opus 4.1 leads
Claude Opus 4.1: 62.4 (#74), Longcat Flash Chat: 61.0 (#91)
| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1419 | 1427 |
| LMArena Creative Writing | 1412 | 1388 |
| LMArena Multi-Turn | 1444 | 1418 |
| Short-Story Creative Writing | 84.7% | — |
Frequently asked questions
Is Claude Opus 4.1 better than Longcat Flash Chat?
Longcat Flash Chat is the stronger model overall, scoring 42.1 to 41.0 on the Noometry Index.
Is Claude Opus 4.1 or Longcat Flash Chat better for coding?
They score almost the same on coding (44.4 vs 43.5); test both on your own repository before choosing.
How many benchmarks do Claude Opus 4.1 and Longcat Flash Chat share?
17 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and Longcat Flash Chat has 19.