# Claude 3.5 Sonnet vs Longcat Flash Chat

> Longcat Flash Chat is the stronger model overall, scoring 42.1 to 34.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-5-sonnet-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Claude 3.5 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 19.2.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | Claude 3.5 Sonnet | Longcat Flash Chat |
|---|---|---|
| Provider | Anthropic | Meituan |
| Noometry Index | 34.6 | 42.1 |
| Rank | 231 | 120 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Open |

## Coding

- Claude 3.5 Sonnet: 39.0 (#165)
- Longcat Flash Chat: 43.5 (#87)

| Benchmark | Claude 3.5 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1342 | 1471 |
| Aider Polyglot | 51.6% | — |
| GSO | 4.6% | — |
| WeirdML | 40% | — |
| BigCodeBench Instruct | 46.8% | — |
| LiveBench Coding | 67.1% | — |
| BigCodeBench Complete | 58.6% | — |
| CadEval | 48% | — |
| HumanEval+ | 81.7% | — |
| MBPP+ | 74.3% | — |

## Agentic & Tool Use

- Claude 3.5 Sonnet: 32.3 (#67)
- Longcat Flash Chat: —

| Benchmark | Claude 3.5 Sonnet | Longcat Flash Chat |
|---|---|---|
| TheAgentCompany | 24% | — |
| Cybench | 17.5% | — |
| BALROG | 32.6% | — |
| METR Time Horizons | 45.2% | — |

## Reasoning

- Claude 3.5 Sonnet: 23.1 (#183)
- Longcat Flash Chat: 19.0 (#272)

| Benchmark | Claude 3.5 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Hard Prompts | 1305 | 1440 |
| SimpleBench | 41.4% | — |
| Kagi LLM Benchmark | — | 43.9% |
| NYT Connections (extended) | — | 17.7% |
| EnigmaEval | 0.9% | — |
| LiveBench Reasoning | 56.7% | — |
| DTBench | 67.8% | — |
| LiveBench Data Analysis | 55% | — |
| Epoch Capabilities Index | 133.55 | — |
| ForecastBench | 60.7 | — |
| LiveBench | 59% | — |

## Math

- Claude 3.5 Sonnet: 19.2 (#288)
- Longcat Flash Chat: 39.4 (#107)

| Benchmark | Claude 3.5 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1307 | 1442 |
| OTIS Mock AIME 2024-2025 | 8.5% | — |
| Omni-MATH | 27.6% | — |
| LiveBench Math | 52.3% | — |
| MATH Level 5 | 56.9% | — |
| FrontierMath (Feb 2025 set) | 2.1% | — |
| FrontierMath Tier 4 (v1) | 0% | — |

## Knowledge

- Claude 3.5 Sonnet: 28.6 (#245)
- Longcat Flash Chat: 40.6 (#116)

| Benchmark | Claude 3.5 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1265 | 1454 |
| GPQA Diamond | 55.3% | — |
| Humanity's Last Exam | 4.1% | — |
| MMLU-Pro | 77.7% | — |
| Confabulations | 19.9% | — |
| GPQA (HELM) | 56.5% | — |
| MMLU | 87.3% | — |

## Multimodal

- Claude 3.5 Sonnet: 26.5 (#120)
- Longcat Flash Chat: —

| Benchmark | Claude 3.5 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Vision | 1125 | — |
| Video-MME | 60% | — |
| GeoBench | 62% | — |
| VPCT | 33% | — |

## Multilingual

- Claude 3.5 Sonnet: 43.2 (#185)
- Longcat Flash Chat: 51.9 (#101)

| Benchmark | Claude 3.5 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1283 | 1404 |
| LMArena Chinese | 1272 | 1465 |
| LMArena French | 1305 | 1456 |
| LMArena German | 1297 | 1408 |
| LMArena Japanese | 1234 | 1373 |
| LMArena Korean | 1200 | 1371 |
| LMArena Russian | 1306 | 1395 |
| LMArena Spanish | 1290 | 1445 |

## Instruction Following

- Claude 3.5 Sonnet: 68.8 (#182)
- Longcat Flash Chat: 74.4 (#96)

| Benchmark | Claude 3.5 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1297 | 1411 |
| LiveBench Instruction Following | 69.3% | — |
| IFEval | 85.5% | — |

## Long Context

- Claude 3.5 Sonnet: 39.9 (#167)
- Longcat Flash Chat: 43.5 (#93)

| Benchmark | Claude 3.5 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1311 | 1425 |

## Writing & Preference

- Claude 3.5 Sonnet: 52.9 (#164)
- Longcat Flash Chat: 61.0 (#91)

| Benchmark | Claude 3.5 Sonnet | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1298 | 1427 |
| LMArena Creative Writing | 1292 | 1388 |
| LMArena Multi-Turn | 1326 | 1418 |
| Short-Story Creative Writing | 80.3% | — |
| EQ-Bench Creative Writing | 1451 | — |
| WildBench | 79.2% | — |
| LiveBench Language | 53.8% | — |

## FAQ

### Is Claude 3.5 Sonnet better than Longcat Flash Chat?

Longcat Flash Chat is the stronger model overall, scoring 42.1 to 34.6 on the Noometry Index.

### Is Claude 3.5 Sonnet or Longcat Flash Chat better for coding?

Longcat Flash Chat scores higher on coding benchmarks: 43.5 versus 39.0 in the Noometry coding category.

### How many benchmarks do Claude 3.5 Sonnet and Longcat Flash Chat share?

17 benchmarks have published results for both models. Claude 3.5 Sonnet has 60 scored results on Noometry and Longcat Flash Chat has 19.