# Claude Opus 4.6 vs Longcat Flash Chat

> Claude Opus 4.6 is the stronger model overall, scoring 58.2 to 42.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-4-6-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Claude Opus 4.6 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 Claude Opus 4.6 leads 57.8 to 19.0.
- The biggest single-benchmark swing is NYT Connections (extended): 92.1% for Claude Opus 4.6 and 17.7% for Longcat Flash Chat.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Opus 4.6 | Longcat Flash Chat |
|---|---|---|
| Provider | Anthropic | Meituan |
| Noometry Index | 58.2 | 42.1 |
| Rank | 20 | 120 |
| Context | 1M | — |
| Input $/M | $5 | — |
| Output $/M | $25 | — |
| Weights | Proprietary | Open |

## Coding

- Claude Opus 4.6: 57.2 (#20)
- Longcat Flash Chat: 43.5 (#87)

| Benchmark | Claude Opus 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1536 | 1471 |
| SWE-bench Verified | 78.7% | — |
| FrontierCode | 26.6% | — |
| SWE-bench Verified (bash only) | 75.6% | — |
| LMArena WebDev | 1547 | — |
| SWE-bench Multilingual | 72% | — |
| GSO | 41.2% | — |
| WeirdML | 78% | — |
| ALE-Bench | 996.5 | — |
| AlgoTune | 1.47 | — |

## Agentic & Tool Use

- Claude Opus 4.6: 51.1 (#4)
- Longcat Flash Chat: —

| Benchmark | Claude Opus 4.6 | Longcat Flash Chat |
|---|---|---|
| Terminal-Bench | 79.8% | — |
| APEX-Agents | 46.3% | — |
| Remote Labor Index | 4.2% | — |
| τ²-bench Banking | 27.3% | — |
| Cybench | 93% | — |
| DeepResearch Bench | 55.3% | — |
| GBAEval | 44.1% | — |
| LMArena Search | 1253 | — |
| METR Time Horizons | 78.9% | — |
| Vending-Bench 2 | 8,018 | — |

## Reasoning

- Claude Opus 4.6: 57.8 (#23)
- Longcat Flash Chat: 19.0 (#272)

| Benchmark | Claude Opus 4.6 | Longcat Flash Chat |
|---|---|---|
| Kagi LLM Benchmark | 83.6% | 43.9% |
| NYT Connections (extended) | 92.1% | 17.7% |
| LMArena Hard Prompts | 1527 | 1440 |
| ARC-AGI-2 | 69.2% | — |
| SimpleBench | 67.6% | — |
| ARC-AGI-1 | 94% | — |
| Chess Puzzles | 17% | — |
| EnigmaEval | 7.6% | — |
| Thematic Generalization | 80.6% | — |
| EBR-Bench | 12.7% | — |
| Mystery Game Puzzles | 25% | — |
| DTBench | 91.2% | — |
| LMCA | 55.8% | — |
| Epoch Capabilities Index | 155.24 | — |
| ForecastBench | 60 | — |

## Math

- Claude Opus 4.6: 63.0 (#31)
- Longcat Flash Chat: 39.4 (#107)

| Benchmark | Claude Opus 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1519 | 1442 |
| FrontierMath (Tiers 1-3) | 66% | — |
| FrontierMath Tier 4 | 26.8% | — |
| MathArena Final-Answer Competitions | 78.5% | — |
| OTIS Mock AIME 2024-2025 | 94.4% | — |
| ProofBench | 50% | — |
| FrontierMath (Feb 2025 set) | 40.7% | — |
| FrontierMath Tier 4 (v1) | 22.9% | — |

## Knowledge

- Claude Opus 4.6: 61.9 (#26)
- Longcat Flash Chat: 40.6 (#116)

| Benchmark | Claude Opus 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1546 | 1454 |
| GPQA Diamond | 90.5% | — |
| Humanity's Last Exam | 34.4% | — |
| SimpleQA Verified | 47% | — |
| Vectara Hallucination Rate | 12.2% | — |

## Multimodal

- Claude Opus 4.6: 37.3 (#74)
- Longcat Flash Chat: —

| Benchmark | Claude Opus 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Vision | 1316 | — |
| Furniture Assembly | 28.3% | — |
| LMArena Document | 1507 | — |

## Multilingual

- Claude Opus 4.6: 57.9 (#6)
- Longcat Flash Chat: 51.9 (#101)

| Benchmark | Claude Opus 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1489 | 1404 |
| LMArena Chinese | 1551 | 1465 |
| LMArena French | 1513 | 1456 |
| LMArena German | 1502 | 1408 |
| LMArena Japanese | 1484 | 1373 |
| LMArena Korean | 1464 | 1371 |
| LMArena Russian | 1497 | 1395 |
| LMArena Spanish | 1510 | 1445 |

## Instruction Following

- Claude Opus 4.6: 79.5 (#4)
- Longcat Flash Chat: 74.4 (#96)

| Benchmark | Claude Opus 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1523 | 1411 |

## Long Context

- Claude Opus 4.6: 48.1 (#13)
- Longcat Flash Chat: 43.5 (#93)

| Benchmark | Claude Opus 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1520 | 1425 |
| CL-bench | 20.7% | — |
| CL-bench Life | 17% | — |

## Writing & Preference

- Claude Opus 4.6: 73.5 (#10)
- Longcat Flash Chat: 61.0 (#91)

| Benchmark | Claude Opus 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1503 | 1427 |
| LMArena Creative Writing | 1505 | 1388 |
| LMArena Multi-Turn | 1513 | 1418 |
| EQ-Bench Creative Writing | 1809 | — |
| EQ-Bench 4 | 1223 | — |

## FAQ

### Is Claude Opus 4.6 better than Longcat Flash Chat?

Claude Opus 4.6 is the stronger model overall, scoring 58.2 to 42.1 on the Noometry Index.

### Is Claude Opus 4.6 or Longcat Flash Chat better for coding?

Claude Opus 4.6 scores higher on coding benchmarks: 57.2 versus 43.5 in the Noometry coding category.

### How many benchmarks do Claude Opus 4.6 and Longcat Flash Chat share?

19 benchmarks have published results for both models. Claude Opus 4.6 has 68 scored results on Noometry and Longcat Flash Chat has 19.