# GPT-5.3 Chat vs Longcat Flash Chat

> GPT-5.3 Chat and Longcat Flash Chat score almost the same on the Noometry Index (42.8 vs 42.1), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-3-chat-vs-longcat-flash-chat
- Last updated: 2026-10-11
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 2 categories and Longcat Flash Chat in 6 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.3 Chat leads 28.5 to 19.0.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Chat | Longcat Flash Chat |
|---|---|---|
| Provider | OpenAI | Meituan |
| Noometry Index | 42.8 | 42.1 |
| Rank | 109 | 120 |
| Context | 128K | — |
| Input $/M | $1.75 | — |
| Output $/M | $14 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Chat: 41.4 (#124)
- Longcat Flash Chat: 43.5 (#87)

| Benchmark | GPT-5.3 Chat | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1408 | 1471 |

## Reasoning

- GPT-5.3 Chat: 28.5 (#102)
- Longcat Flash Chat: 19.0 (#272)

| Benchmark | GPT-5.3 Chat | Longcat Flash Chat |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1440 |
| Kagi LLM Benchmark | — | 43.9% |
| NYT Connections (extended) | — | 17.7% |

## Math

- GPT-5.3 Chat: 38.2 (#142)
- Longcat Flash Chat: 39.4 (#107)

| Benchmark | GPT-5.3 Chat | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1389 | 1442 |

## Knowledge

- GPT-5.3 Chat: 38.8 (#140)
- Longcat Flash Chat: 40.6 (#116)

| Benchmark | GPT-5.3 Chat | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1397 | 1454 |

## Multilingual

- GPT-5.3 Chat: 50.3 (#124)
- Longcat Flash Chat: 51.9 (#101)

| Benchmark | GPT-5.3 Chat | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1382 | 1404 |
| LMArena Chinese | 1432 | 1465 |
| LMArena French | 1397 | 1456 |
| LMArena German | 1384 | 1408 |
| LMArena Japanese | 1352 | 1373 |
| LMArena Korean | 1346 | 1371 |
| LMArena Russian | 1400 | 1395 |
| LMArena Spanish | 1371 | 1445 |

## Instruction Following

- GPT-5.3 Chat: 72.8 (#129)
- Longcat Flash Chat: 74.4 (#96)

| Benchmark | GPT-5.3 Chat | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1378 | 1411 |

## Long Context

- GPT-5.3 Chat: 42.6 (#120)
- Longcat Flash Chat: 43.5 (#93)

| Benchmark | GPT-5.3 Chat | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1396 | 1425 |

## Writing & Preference

- GPT-5.3 Chat: 63.1 (#68)
- Longcat Flash Chat: 61.0 (#91)

| Benchmark | GPT-5.3 Chat | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1389 | 1427 |
| LMArena Creative Writing | 1355 | 1388 |
| LMArena Multi-Turn | 1412 | 1418 |
| EQ-Bench Creative Writing | 1690 | — |

## FAQ

### Is GPT-5.3 Chat better than Longcat Flash Chat?

GPT-5.3 Chat and Longcat Flash Chat score almost the same on the Noometry Index (42.8 vs 42.1), so choose on price, context window or the category you care about most.

### Is GPT-5.3 Chat or Longcat Flash Chat better for coding?

Longcat Flash Chat scores higher on coding benchmarks: 43.5 versus 41.4 in the Noometry coding category.

### How many benchmarks do GPT-5.3 Chat and Longcat Flash Chat share?

17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Longcat Flash Chat has 19.