# Claude Opus 4.1 vs Longcat Flash Chat

> Claude Opus 4.1 and Longcat Flash Chat score almost the same on the Noometry Index (40.8 vs 41.5), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/claude-opus-4-1-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 17

## 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; 6 gaps are clear of the uncertainty.
- The widest gap is in math, where Longcat Flash Chat leads 36.6 to 22.0.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| Provider | Anthropic | Meituan |
| Noometry Index | 40.8 | 41.5 |
| Rank | 136 | 121 |
| Context | 200K | — |
| Input $/M | $15 | — |
| Output $/M | $75 | — |
| Weights | Proprietary | Open |

## Coding

- Claude Opus 4.1: 44.3 (#69)
- Longcat Flash Chat: 42.9 (#85)

| 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

- Claude Opus 4.1: 34.8 (#38)
- 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: 31.6 (#70)
- Longcat Flash Chat: 18.3 (#267)

| 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 | 144.11 | — |
| ForecastBench | 62 | — |

## Math

- Claude Opus 4.1: 22.0 (#267)
- Longcat Flash Chat: 36.6 (#107)

| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1430 | 1441 |
| 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: 41.9 (#93)
- Longcat Flash Chat: 40.0 (#111)

| 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

- Claude Opus 4.1: 26.2 (#114)
- Longcat Flash Chat: —

| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| VPCT | 35% | — |

## Multilingual

- Claude Opus 4.1: 52.1 (#90)
- Longcat Flash Chat: 52.1 (#95)

| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1405 | 1404 |
| LMArena Chinese | 1427 | 1465 |
| LMArena French | 1432 | 1457 |
| LMArena German | 1412 | 1409 |
| LMArena Japanese | 1378 | 1373 |
| LMArena Korean | 1381 | 1372 |
| LMArena Russian | 1421 | 1396 |
| LMArena Spanish | 1448 | 1445 |

## Instruction Following

- Claude Opus 4.1: 75.8 (#53)
- Longcat Flash Chat: 74.6 (#92)

| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1436 | 1411 |

## Long Context

- Claude Opus 4.1: 44.5 (#60)
- Longcat Flash Chat: 43.5 (#89)

| Benchmark | Claude Opus 4.1 | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1455 | 1425 |

## Writing & Preference

- Claude Opus 4.1: 62.6 (#70)
- Longcat Flash Chat: 61.2 (#88)

| 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% | — |

## FAQ

### Is Claude Opus 4.1 better than Longcat Flash Chat?

Claude Opus 4.1 and Longcat Flash Chat score almost the same on the Noometry Index (40.8 vs 41.5), so choose on price, context window or the category you care about most.

### Is Claude Opus 4.1 or Longcat Flash Chat better for coding?

Claude Opus 4.1 scores higher on coding benchmarks: 44.3 versus 42.9 in the Noometry coding category.

### 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.