# GPT-5.4 nano vs Longcat Flash Chat

> GPT-5.4 nano and Longcat Flash Chat score almost the same on the Noometry Index (41.9 vs 41.5), so choose on price, context window or the category you care about most.

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

## Summary

- They share 18 benchmarks with published results for both. GPT-5.4 nano scores higher in 4 categories and Longcat Flash Chat in 4 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.4 nano leads 23.8 to 18.3.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| Provider | OpenAI | Meituan |
| Noometry Index | 41.9 | 41.5 |
| Rank | 111 | 121 |
| Context | 400K | — |
| Input $/M | $0.20 | — |
| Output $/M | $1.25 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.4 nano: 43.1 (#82)
- Longcat Flash Chat: 42.9 (#85)

| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1404 | 1471 |
| SciCode | 46.9% | — |
| WeirdML | 49.2% | — |
| ALE-Bench | 1,005 | — |

## Reasoning

- GPT-5.4 nano: 23.8 (#159)
- Longcat Flash Chat: 18.3 (#267)

| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| Kagi LLM Benchmark | 39.7% | 43.9% |
| LMArena Hard Prompts | 1380 | 1440 |
| ARC-AGI-2 | 5.7% | — |
| NYT Connections (extended) | — | 17.7% |
| ARC-AGI-1 | 51.5% | — |
| CritPt | 9.3% | — |
| Chess Puzzles | 30% | — |
| Mystery Game Puzzles | 9% | — |
| DTBench | 80.3% | — |
| LMCA | 36.9% | — |
| Epoch Capabilities Index | 145.78 | — |
| ForecastBench | 57.3 | — |

## Math

- GPT-5.4 nano: 40.7 (#76)
- Longcat Flash Chat: 36.6 (#107)

| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1406 | 1441 |
| FrontierMath (Tiers 1-3) | 44.9% | — |
| FrontierMath Tier 4 | 12.2% | — |
| OTIS Mock AIME 2024-2025 | 87.8% | — |
| ProofBench | 5% | — |
| FrontierMath (Feb 2025 set) | 25.9% | — |
| FrontierMath Tier 4 (v1) | 6.3% | — |

## Knowledge

- GPT-5.4 nano: 41.8 (#94)
- Longcat Flash Chat: 40.0 (#111)

| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1397 | 1454 |
| GPQA Diamond | 78.5% | — |
| SimpleQA Verified | 11.7% | — |
| Vectara Hallucination Rate | 3.1% | — |

## Multimodal

- GPT-5.4 nano: 36.0 (#73)
- Longcat Flash Chat: —

| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Vision | 1196 | — |

## Multilingual

- GPT-5.4 nano: 48.8 (#136)
- Longcat Flash Chat: 52.1 (#95)

| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1359 | 1404 |
| LMArena Chinese | 1391 | 1465 |
| LMArena French | 1396 | 1457 |
| LMArena German | 1368 | 1409 |
| LMArena Japanese | 1342 | 1373 |
| LMArena Korean | 1321 | 1372 |
| LMArena Russian | 1363 | 1396 |
| LMArena Spanish | 1368 | 1445 |

## Instruction Following

- GPT-5.4 nano: 72.1 (#139)
- Longcat Flash Chat: 74.6 (#92)

| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1362 | 1411 |

## Long Context

- GPT-5.4 nano: 41.6 (#131)
- Longcat Flash Chat: 43.5 (#89)

| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1365 | 1425 |

## Writing & Preference

- GPT-5.4 nano: 55.9 (#137)
- Longcat Flash Chat: 61.2 (#88)

| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1372 | 1427 |
| LMArena Creative Writing | 1313 | 1388 |
| LMArena Multi-Turn | 1382 | 1418 |

## FAQ

### Is GPT-5.4 nano better than Longcat Flash Chat?

GPT-5.4 nano and Longcat Flash Chat score almost the same on the Noometry Index (41.9 vs 41.5), so choose on price, context window or the category you care about most.

### Is GPT-5.4 nano or Longcat Flash Chat better for coding?

They score almost the same on coding (43.1 vs 42.9); test both on your own repository before choosing.

### How many benchmarks do GPT-5.4 nano and Longcat Flash Chat share?

18 benchmarks have published results for both models. GPT-5.4 nano has 40 scored results on Noometry and Longcat Flash Chat has 19.