# Claude Haiku 4.5 vs Longcat Flash Chat

> Longcat Flash Chat is the stronger model overall, scoring 41.5 to 39.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-haiku-4-5-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Claude Haiku 4.5 scores higher in 3 categories and Longcat Flash Chat in 5 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Haiku 4.5 leads 43.0 to 36.6.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Haiku 4.5 | Longcat Flash Chat |
|---|---|---|
| Provider | Anthropic | Meituan |
| Noometry Index | 39.3 | 41.5 |
| Rank | 155 | 121 |
| Context | 200K | — |
| Input $/M | $1 | — |
| Output $/M | $5 | — |
| Weights | Proprietary | Open |

## Coding

- Claude Haiku 4.5: 43.9 (#71)
- Longcat Flash Chat: 42.9 (#85)

| Benchmark | Claude Haiku 4.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1454 | 1471 |
| SWE-bench Verified (bash only) | 66.6% | — |
| LMArena WebDev | 1330 | — |
| SWE-bench Multilingual | 64.7% | — |
| SciCode | 43.3% | — |
| WeirdML | 45.4% | — |
| ALE-Bench | 653.48 | — |

## Agentic & Tool Use

- Claude Haiku 4.5: 33.5 (#50)
- Longcat Flash Chat: —

| Benchmark | Claude Haiku 4.5 | Longcat Flash Chat |
|---|---|---|
| Terminal-Bench | 35.5% | — |
| Berkeley Function Calling Leaderboard | 68.7% | — |
| DeepResearch Bench | 45.5% | — |
| BALROG | 31.2% | — |
| ExploitBench | 13.7% | — |
| Vending-Bench 2 | 458.89 | — |

## Reasoning

- Claude Haiku 4.5: 15.1 (#310)
- Longcat Flash Chat: 18.3 (#267)

| Benchmark | Claude Haiku 4.5 | Longcat Flash Chat |
|---|---|---|
| NYT Connections (extended) | 14.3% | 17.7% |
| LMArena Hard Prompts | 1420 | 1440 |
| ARC-AGI-2 | 4% | — |
| Kagi LLM Benchmark | — | 43.9% |
| ARC-AGI-1 | 47.7% | — |
| CritPt | 0% | — |
| Chess Puzzles | 8% | — |
| DTBench | 73.6% | — |
| LMCA | 30.9% | — |
| Epoch Capabilities Index | 142.42 | — |
| ForecastBench | 61.4 | — |

## Math

- Claude Haiku 4.5: 43.0 (#69)
- Longcat Flash Chat: 36.6 (#107)

| Benchmark | Claude Haiku 4.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1395 | 1441 |
| OTIS Mock AIME 2024-2025 | 66.7% | — |
| Omni-MATH | 56.1% | — |
| MATH Level 5 | 96.4% | — |
| FrontierMath (Feb 2025 set) | 5.9% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |

## Knowledge

- Claude Haiku 4.5: 37.6 (#146)
- Longcat Flash Chat: 40.0 (#111)

| Benchmark | Claude Haiku 4.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1443 | 1454 |
| GPQA Diamond | 71.2% | — |
| SimpleQA Verified | 13.2% | — |
| MMLU-Pro | 77.7% | — |
| Vectara Hallucination Rate | 9.8% | — |
| GPQA (HELM) | 60.5% | — |

## Multimodal

- Claude Haiku 4.5: 27.0 (#111)
- Longcat Flash Chat: —

| Benchmark | Claude Haiku 4.5 | Longcat Flash Chat |
|---|---|---|
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | 1420 | — |

## Multilingual

- Claude Haiku 4.5: 50.1 (#124)
- Longcat Flash Chat: 52.1 (#95)

| Benchmark | Claude Haiku 4.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1376 | 1404 |
| LMArena Chinese | 1415 | 1465 |
| LMArena French | 1408 | 1457 |
| LMArena German | 1377 | 1409 |
| LMArena Japanese | 1339 | 1373 |
| LMArena Korean | 1346 | 1372 |
| LMArena Russian | 1380 | 1396 |
| LMArena Spanish | 1420 | 1445 |

## Instruction Following

- Claude Haiku 4.5: 71.6 (#144)
- Longcat Flash Chat: 74.6 (#92)

| Benchmark | Claude Haiku 4.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1414 | 1411 |
| IFEval | 80.1% | — |

## Long Context

- Claude Haiku 4.5: 43.6 (#86)
- Longcat Flash Chat: 43.5 (#89)

| Benchmark | Claude Haiku 4.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1427 | 1425 |

## Writing & Preference

- Claude Haiku 4.5: 58.1 (#119)
- Longcat Flash Chat: 61.2 (#88)

| Benchmark | Claude Haiku 4.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1396 | 1427 |
| LMArena Creative Writing | 1371 | 1388 |
| LMArena Multi-Turn | 1409 | 1418 |
| WildBench | 83.9% | — |
| EQ-Bench 4 | 1064 | — |

## FAQ

### Is Claude Haiku 4.5 better than Longcat Flash Chat?

Longcat Flash Chat is the stronger model overall, scoring 41.5 to 39.3 on the Noometry Index.

### Is Claude Haiku 4.5 or Longcat Flash Chat better for coding?

They score almost the same on coding (43.9 vs 42.9); test both on your own repository before choosing.

### How many benchmarks do Claude Haiku 4.5 and Longcat Flash Chat share?

18 benchmarks have published results for both models. Claude Haiku 4.5 has 53 scored results on Noometry and Longcat Flash Chat has 19.