# Claude 3 Sonnet vs Longcat Flash Chat

> Longcat Flash Chat is the stronger model overall, scoring 42.1 to 29.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-sonnet-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Claude 3 Sonnet scores higher in 1 category and Longcat Flash Chat in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Longcat Flash Chat leads 39.4 to 10.7.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | Claude 3 Sonnet | Longcat Flash Chat |
|---|---|---|
| Provider | Anthropic | Meituan |
| Noometry Index | 29.0 | 42.1 |
| Rank | 319 | 120 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Open |

## Coding

- Claude 3 Sonnet: 29.6 (#302)
- Longcat Flash Chat: 43.5 (#87)

| Benchmark | Claude 3 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1223 | 1471 |
| WeirdML | 10.2% | — |
| BigCodeBench Instruct | 42.7% | — |
| BigCodeBench Complete | 53.8% | — |
| HumanEval+ | 64% | — |
| MBPP+ | 69.3% | — |

## Reasoning

- Claude 3 Sonnet: 20.5 (#237)
- Longcat Flash Chat: 19.0 (#272)

| Benchmark | Claude 3 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Hard Prompts | 1197 | 1440 |
| Kagi LLM Benchmark | — | 43.9% |
| NYT Connections (extended) | — | 17.7% |
| DTBench | 53.6% | — |
| Epoch Capabilities Index | 120.7 | — |
| WinoGrande | 75.1% | — |

## Math

- Claude 3 Sonnet: 10.7 (#310)
- Longcat Flash Chat: 39.4 (#107)

| Benchmark | Claude 3 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1213 | 1442 |
| OTIS Mock AIME 2024-2025 | 2.5% | — |
| MATH Level 5 | 18.2% | — |

## Knowledge

- Claude 3 Sonnet: 21.1 (#276)
- Longcat Flash Chat: 40.6 (#116)

| Benchmark | Claude 3 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1173 | 1454 |
| GPQA Diamond | 40.6% | — |
| MMLU | 75.9% | — |

## Multimodal

- Claude 3 Sonnet: 25.2 (#125)
- Longcat Flash Chat: —

| Benchmark | Claude 3 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Vision | 984 | — |

## Multilingual

- Claude 3 Sonnet: 37.8 (#234)
- Longcat Flash Chat: 51.9 (#101)

| Benchmark | Claude 3 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1205 | 1404 |
| LMArena Chinese | 1189 | 1465 |
| LMArena French | 1229 | 1456 |
| LMArena German | 1204 | 1408 |
| LMArena Japanese | 1131 | 1373 |
| LMArena Korean | 1128 | 1371 |
| LMArena Russian | 1227 | 1395 |
| LMArena Spanish | 1204 | 1445 |

## Instruction Following

- Claude 3 Sonnet: 62.8 (#235)
- Longcat Flash Chat: 74.4 (#96)

| Benchmark | Claude 3 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1199 | 1411 |

## Long Context

- Claude 3 Sonnet: 36.7 (#228)
- Longcat Flash Chat: 43.5 (#93)

| Benchmark | Claude 3 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1211 | 1425 |

## Writing & Preference

- Claude 3 Sonnet: 42.1 (#238)
- Longcat Flash Chat: 61.0 (#91)

| Benchmark | Claude 3 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1218 | 1427 |
| LMArena Creative Writing | 1186 | 1388 |
| LMArena Multi-Turn | 1227 | 1418 |

## FAQ

### Is Claude 3 Sonnet better than Longcat Flash Chat?

Longcat Flash Chat is the stronger model overall, scoring 42.1 to 29.0 on the Noometry Index.

### Is Claude 3 Sonnet or Longcat Flash Chat better for coding?

Longcat Flash Chat scores higher on coding benchmarks: 43.5 versus 29.6 in the Noometry coding category.

### How many benchmarks do Claude 3 Sonnet and Longcat Flash Chat share?

17 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and Longcat Flash Chat has 19.