# DeepSeek V4 Flash vs Longcat Flash Chat

> DeepSeek V4 Flash is the stronger model overall, scoring 53.6 to 41.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/deepseek-v4-flash-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. DeepSeek V4 Flash scores higher in 8 categories and Longcat Flash Chat in 0 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where DeepSeek V4 Flash leads 53.7 to 18.3.
- The biggest single-benchmark swing is NYT Connections (extended): 89.6% for DeepSeek V4 Flash and 17.7% for Longcat Flash Chat.

## Snapshot

| | DeepSeek V4 Flash | Longcat Flash Chat |
|---|---|---|
| Provider | DeepSeek | Meituan |
| Noometry Index | 53.6 | 41.5 |
| Rank | 32 | 121 |
| Context | 1M | — |
| Input $/M | $0.15 | — |
| Output $/M | $0.60 | — |
| Weights | Open | Open |

## Coding

- DeepSeek V4 Flash: 47.6 (#56)
- Longcat Flash Chat: 42.9 (#85)

| Benchmark | DeepSeek V4 Flash | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1457 | 1471 |
| FrontierCode | 18.8% | — |
| LMArena WebDev | 1581 | — |
| SciCode | 49.9% | — |
| WeirdML | 63% | — |
| ALE-Bench | 1,306 | — |

## Reasoning

- DeepSeek V4 Flash: 53.7 (#25)
- Longcat Flash Chat: 18.3 (#267)

| Benchmark | DeepSeek V4 Flash | Longcat Flash Chat |
|---|---|---|
| Kagi LLM Benchmark | 52.2% | 43.9% |
| NYT Connections (extended) | 89.6% | 17.7% |
| LMArena Hard Prompts | 1443 | 1440 |
| ARC-AGI-2 | 61.4% | — |
| SimpleBench | 61.1% | — |
| ARC-AGI-1 | 89% | — |
| CritPt | 16.6% | — |
| Chess Puzzles | 33% | — |
| Mystery Game Puzzles | 34% | — |
| DTBench | 90.9% | — |
| LMCA | 41.7% | — |
| Epoch Capabilities Index | 154.51 | — |

## Math

- DeepSeek V4 Flash: 60.0 (#31)
- Longcat Flash Chat: 36.6 (#107)

| Benchmark | DeepSeek V4 Flash | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1427 | 1441 |
| FrontierMath (Tiers 1-3) | 57.5% | — |
| FrontierMath Tier 4 | 24.4% | — |
| MathArena Final-Answer Competitions | 76.5% | — |
| OTIS Mock AIME 2024-2025 | 94.4% | — |
| ProofBench | 56% | — |

## Knowledge

- DeepSeek V4 Flash: 55.5 (#43)
- Longcat Flash Chat: 40.0 (#111)

| Benchmark | DeepSeek V4 Flash | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1441 | 1454 |
| GPQA Diamond | 91% | — |
| SimpleQA Verified | 33.6% | — |

## Multilingual

- DeepSeek V4 Flash: 53.2 (#71)
- Longcat Flash Chat: 52.1 (#95)

| Benchmark | DeepSeek V4 Flash | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1420 | 1404 |
| LMArena Chinese | 1467 | 1465 |
| LMArena French | 1438 | 1457 |
| LMArena German | 1418 | 1409 |
| LMArena Japanese | 1403 | 1373 |
| LMArena Korean | 1383 | 1372 |
| LMArena Russian | 1428 | 1396 |
| LMArena Spanish | 1437 | 1445 |

## Instruction Following

- DeepSeek V4 Flash: 75.1 (#76)
- Longcat Flash Chat: 74.6 (#92)

| Benchmark | DeepSeek V4 Flash | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1421 | 1411 |

## Long Context

- DeepSeek V4 Flash: 43.8 (#81)
- Longcat Flash Chat: 43.5 (#89)

| Benchmark | DeepSeek V4 Flash | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1435 | 1425 |

## Writing & Preference

- DeepSeek V4 Flash: 64.0 (#59)
- Longcat Flash Chat: 61.2 (#88)

| Benchmark | DeepSeek V4 Flash | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1432 | 1427 |
| LMArena Creative Writing | 1403 | 1388 |
| LMArena Multi-Turn | 1449 | 1418 |
| EQ-Bench Creative Writing | 1559 | — |

## FAQ

### Is DeepSeek V4 Flash better than Longcat Flash Chat?

DeepSeek V4 Flash is the stronger model overall, scoring 53.6 to 41.5 on the Noometry Index.

### Is DeepSeek V4 Flash or Longcat Flash Chat better for coding?

DeepSeek V4 Flash scores higher on coding benchmarks: 47.6 versus 42.9 in the Noometry coding category.

### How many benchmarks do DeepSeek V4 Flash and Longcat Flash Chat share?

19 benchmarks have published results for both models. DeepSeek V4 Flash has 41 scored results on Noometry and Longcat Flash Chat has 19.