# Grok 4.1 Fast vs Longcat Flash Chat

> Grok 4.1 Fast and Longcat Flash Chat score almost the same on the Noometry Index (40.9 vs 41.5), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Grok 4.1 Fast scores higher in 1 category and Longcat Flash Chat in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 18.3.
- The biggest single-benchmark swing is NYT Connections (extended): 87.4% for Grok 4.1 Fast and 17.7% for Longcat Flash Chat.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 Fast | Longcat Flash Chat |
|---|---|---|
| Provider | xAI | Meituan |
| Noometry Index | 40.9 | 41.5 |
| Rank | 131 | 121 |
| Context | 128K | — |
| Input $/M | $0.20 | — |
| Output $/M | $0.50 | — |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1 Fast: 33.8 (#236)
- Longcat Flash Chat: 42.9 (#85)

| Benchmark | Grok 4.1 Fast | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1411 | 1471 |
| LMArena WebDev | 1241 | — |
| ALE-Bench | 394.93 | — |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.1 (#35)
- Longcat Flash Chat: —

| Benchmark | Grok 4.1 Fast | Longcat Flash Chat |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |

## Reasoning

- Grok 4.1 Fast: 42.3 (#45)
- Longcat Flash Chat: 18.3 (#267)

| Benchmark | Grok 4.1 Fast | Longcat Flash Chat |
|---|---|---|
| NYT Connections (extended) | 87.4% | 17.7% |
| LMArena Hard Prompts | 1407 | 1440 |
| SimpleBench | 56% | — |
| Kagi LLM Benchmark | — | 43.9% |
| DTBench | 87.7% | — |
| ForecastBench | 61 | — |

## Math

- Grok 4.1 Fast: 30.9 (#201)
- Longcat Flash Chat: 36.6 (#107)

| Benchmark | Grok 4.1 Fast | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1408 | 1441 |
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |

## Knowledge

- Grok 4.1 Fast: 32.6 (#203)
- Longcat Flash Chat: 40.0 (#111)

| Benchmark | Grok 4.1 Fast | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1398 | 1454 |
| Vectara Hallucination Rate | 17.8% | — |

## Multimodal

- Grok 4.1 Fast: 36.3 (#71)
- Longcat Flash Chat: —

| Benchmark | Grok 4.1 Fast | Longcat Flash Chat |
|---|---|---|
| LMArena Vision | 1201 | — |

## Multilingual

- Grok 4.1 Fast: 51.1 (#110)
- Longcat Flash Chat: 52.1 (#95)

| Benchmark | Grok 4.1 Fast | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1391 | 1404 |
| LMArena Chinese | 1441 | 1465 |
| LMArena French | 1416 | 1457 |
| LMArena German | 1404 | 1409 |
| LMArena Japanese | 1347 | 1373 |
| LMArena Korean | 1361 | 1372 |
| LMArena Russian | 1387 | 1396 |
| LMArena Spanish | 1411 | 1445 |

## Instruction Following

- Grok 4.1 Fast: 72.8 (#127)
- Longcat Flash Chat: 74.6 (#92)

| Benchmark | Grok 4.1 Fast | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1376 | 1411 |

## Long Context

- Grok 4.1 Fast: 42.4 (#121)
- Longcat Flash Chat: 43.5 (#89)

| Benchmark | Grok 4.1 Fast | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1390 | 1425 |

## Writing & Preference

- Grok 4.1 Fast: 57.4 (#126)
- Longcat Flash Chat: 61.2 (#88)

| Benchmark | Grok 4.1 Fast | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1408 | 1427 |
| LMArena Creative Writing | 1394 | 1388 |
| LMArena Multi-Turn | 1389 | 1418 |
| EQ-Bench Creative Writing | 1327 | — |

## FAQ

### Is Grok 4.1 Fast better than Longcat Flash Chat?

Grok 4.1 Fast and Longcat Flash Chat score almost the same on the Noometry Index (40.9 vs 41.5), so choose on price, context window or the category you care about most.

### Is Grok 4.1 Fast or Longcat Flash Chat better for coding?

Longcat Flash Chat scores higher on coding benchmarks: 42.9 versus 33.8 in the Noometry coding category.

### How many benchmarks do Grok 4.1 Fast and Longcat Flash Chat share?

18 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Longcat Flash Chat has 19.