# GPT-5.4 Pro vs Longcat Flash Chat

> GPT-5.4 Pro is the stronger model overall, scoring 58.8 to 41.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-4-pro-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where GPT-5.4 Pro leads 71.0 to 18.3.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.4 Pro | Longcat Flash Chat |
|---|---|---|
| Provider | OpenAI | Meituan |
| Noometry Index | 58.8 | 41.5 |
| Rank | 16 | 121 |
| Context | 1.05M | — |
| Input $/M | $30 | — |
| Output $/M | $180 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.4 Pro: 42.6 (#89)
- Longcat Flash Chat: 42.9 (#85)

| Benchmark | GPT-5.4 Pro | Longcat Flash Chat |
|---|---|---|
| WeirdML | 57.4% | — |
| LMArena Coding | — | 1471 |

## Reasoning

- GPT-5.4 Pro: 71.0 (#10)
- Longcat Flash Chat: 18.3 (#267)

| Benchmark | GPT-5.4 Pro | Longcat Flash Chat |
|---|---|---|
| ARC-AGI-2 | 83.3% | — |
| SimpleBench | 74.1% | — |
| Kagi LLM Benchmark | — | 43.9% |
| NYT Connections (extended) | — | 17.7% |
| ARC-AGI-1 | 94.5% | — |
| CritPt | 30% | — |
| Chess Puzzles | 58.6% | — |
| EnigmaEval | 23.8% | — |
| LMArena Hard Prompts | — | 1440 |
| Epoch Capabilities Index | 159.12 | — |

## Math

- GPT-5.4 Pro: 72.0 (#17)
- Longcat Flash Chat: 36.6 (#107)

| Benchmark | GPT-5.4 Pro | Longcat Flash Chat |
|---|---|---|
| FrontierMath (Tiers 1-3) | 82.5% | — |
| FrontierMath Tier 4 | 58.5% | — |
| LMArena Math | — | 1441 |
| FrontierMath (Feb 2025 set) | 50% | — |
| FrontierMath Tier 4 (v1) | 37.5% | — |

## Knowledge

- GPT-5.4 Pro: 68.3 (#6)
- Longcat Flash Chat: 40.0 (#111)

| Benchmark | GPT-5.4 Pro | Longcat Flash Chat |
|---|---|---|
| GPQA Diamond | 94.6% | — |
| Humanity's Last Exam | 44.3% | — |
| SimpleQA Verified | 46.3% | — |
| Vectara Hallucination Rate | 8.3% | — |
| LMArena Expert | — | 1454 |

## Multilingual

- GPT-5.4 Pro: —
- Longcat Flash Chat: 52.1 (#95)

| Benchmark | GPT-5.4 Pro | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | — | 1404 |
| LMArena Chinese | — | 1465 |
| LMArena French | — | 1457 |
| LMArena German | — | 1409 |
| LMArena Japanese | — | 1373 |
| LMArena Korean | — | 1372 |
| LMArena Russian | — | 1396 |
| LMArena Spanish | — | 1445 |

## Instruction Following

- GPT-5.4 Pro: —
- Longcat Flash Chat: 74.6 (#92)

| Benchmark | GPT-5.4 Pro | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | — | 1411 |

## Long Context

- GPT-5.4 Pro: —
- Longcat Flash Chat: 43.5 (#89)

| Benchmark | GPT-5.4 Pro | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | — | 1425 |

## Writing & Preference

- GPT-5.4 Pro: —
- Longcat Flash Chat: 61.2 (#88)

| Benchmark | GPT-5.4 Pro | Longcat Flash Chat |
|---|---|---|
| LMArena Text | — | 1427 |
| LMArena Creative Writing | — | 1388 |
| LMArena Multi-Turn | — | 1418 |

## FAQ

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

GPT-5.4 Pro is the stronger model overall, scoring 58.8 to 41.5 on the Noometry Index.

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

They score almost the same on coding (42.6 vs 42.9); test both on your own repository before choosing.

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

0 benchmarks have published results for both models. GPT-5.4 Pro has 16 scored results on Noometry and Longcat Flash Chat has 19.