# Claude Sonnet 4.6 vs Longcat Flash Chat

> Claude Sonnet 4.6 is the stronger model overall, scoring 50.3 to 42.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-4-6-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Claude Sonnet 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 Sonnet 4.6 leads 46.1 to 19.0.
- The biggest single-benchmark swing is NYT Connections (extended): 80.9% for Claude Sonnet 4.6 and 17.7% for Longcat Flash Chat.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Sonnet 4.6 | Longcat Flash Chat |
|---|---|---|
| Provider | Anthropic | Meituan |
| Noometry Index | 50.3 | 42.1 |
| Rank | 50 | 120 |
| Context | 1M | — |
| Input $/M | $3 | — |
| Output $/M | $15 | — |
| Weights | Proprietary | Open |

## Coding

- Claude Sonnet 4.6: 46.3 (#67)
- Longcat Flash Chat: 43.5 (#87)

| Benchmark | Claude Sonnet 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1504 | 1471 |
| SWE-bench Verified | 75.2% | — |
| DeepSWE | 29.9% | — |
| FrontierCode | 24.3% | — |
| LMArena WebDev | 1522 | — |
| SciCode | 46.8% | — |
| WeirdML | 66.1% | — |
| ALE-Bench | 1,327 | — |

## Agentic & Tool Use

- Claude Sonnet 4.6: 39.1 (#28)
- Longcat Flash Chat: —

| Benchmark | Claude Sonnet 4.6 | Longcat Flash Chat |
|---|---|---|
| Terminal-Bench | 53.4% | — |
| APEX-Agents | 43% | — |
| OSWorld 2.0 | 9.3% | — |
| DeepResearch Bench | 54.9% | — |
| OSWorld | 72.1% | — |
| ExploitBench | 23.6% | — |
| GBAEval | 48.8% | — |
| GDP.pdf | 18% | — |
| LMArena Search | 1221 | — |
| Vending-Bench 2 | 7,204 | — |

## Reasoning

- Claude Sonnet 4.6: 46.1 (#45)
- Longcat Flash Chat: 19.0 (#272)

| Benchmark | Claude Sonnet 4.6 | Longcat Flash Chat |
|---|---|---|
| NYT Connections (extended) | 80.9% | 17.7% |
| LMArena Hard Prompts | 1484 | 1440 |
| ARC-AGI-2 | 60.4% | — |
| Kagi LLM Benchmark | — | 43.9% |
| ARC-AGI-1 | 86.5% | — |
| CritPt | 3.1% | — |
| Chess Puzzles | 13% | — |
| Thematic Generalization | 76.3% | — |
| Mystery Game Puzzles | 16% | — |
| DTBench | 89.9% | — |
| LMCA | 46.5% | — |
| Epoch Capabilities Index | 152.24 | — |
| ForecastBench | 62 | — |

## Math

- Claude Sonnet 4.6: 52.9 (#49)
- Longcat Flash Chat: 39.4 (#107)

| Benchmark | Claude Sonnet 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1462 | 1442 |
| OTIS Mock AIME 2024-2025 | 85.8% | — |
| ProofBench | 45% | — |
| FrontierMath (Feb 2025 set) | 32.4% | — |
| FrontierMath Tier 4 (v1) | 8.3% | — |

## Knowledge

- Claude Sonnet 4.6: 51.7 (#65)
- Longcat Flash Chat: 40.6 (#116)

| Benchmark | Claude Sonnet 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1500 | 1454 |
| GPQA Diamond | 87.4% | — |
| SimpleQA Verified | 35.5% | — |
| Vectara Hallucination Rate | 10.6% | — |

## Multimodal

- Claude Sonnet 4.6: 38.0 (#68)
- Longcat Flash Chat: —

| Benchmark | Claude Sonnet 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Vision | 1283 | — |
| Blueprint-Bench 2 | 6.7% | — |
| LMArena Document | 1482 | — |

## Multilingual

- Claude Sonnet 4.6: 54.4 (#41)
- Longcat Flash Chat: 51.9 (#101)

| Benchmark | Claude Sonnet 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1440 | 1404 |
| LMArena Chinese | 1491 | 1465 |
| LMArena French | 1465 | 1456 |
| LMArena German | 1428 | 1408 |
| LMArena Japanese | 1420 | 1373 |
| LMArena Korean | 1411 | 1371 |
| LMArena Russian | 1440 | 1395 |
| LMArena Spanish | 1464 | 1445 |

## Instruction Following

- Claude Sonnet 4.6: 77.4 (#25)
- Longcat Flash Chat: 74.4 (#96)

| Benchmark | Claude Sonnet 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1475 | 1411 |

## Long Context

- Claude Sonnet 4.6: 45.3 (#44)
- Longcat Flash Chat: 43.5 (#93)

| Benchmark | Claude Sonnet 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1479 | 1425 |

## Writing & Preference

- Claude Sonnet 4.6: 70.2 (#22)
- Longcat Flash Chat: 61.0 (#91)

| Benchmark | Claude Sonnet 4.6 | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1458 | 1427 |
| LMArena Creative Writing | 1435 | 1388 |
| LMArena Multi-Turn | 1464 | 1418 |
| EQ-Bench Creative Writing | 1810 | — |
| EQ-Bench 4 | 1207 | — |

## FAQ

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

Claude Sonnet 4.6 is the stronger model overall, scoring 50.3 to 42.1 on the Noometry Index.

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

Claude Sonnet 4.6 scores higher on coding benchmarks: 46.3 versus 43.5 in the Noometry coding category.

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

18 benchmarks have published results for both models. Claude Sonnet 4.6 has 57 scored results on Noometry and Longcat Flash Chat has 19.