Model comparison
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.
Last verified . 17 shared benchmarks.
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.
Side by side
| GPT-5.3 Chat | Longcat Flash Chat | |
|---|---|---|
| Provider | OpenAI | Meituan |
| Noometry Index | 42.8 | 42.1 |
| Released | 2026-03-03 | — |
| Weights | Proprietary | Open |
| Context window | 128K | — |
| Max output | 16K | — |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 18 | 19 |
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Category by category
Coding Longcat Flash Chat leads
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 leads
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 Longcat Flash Chat leads
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 Longcat Flash Chat leads
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 Longcat Flash Chat leads
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 Longcat Flash Chat leads
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 Too close to call
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 leads
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 | — |
Frequently asked questions
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.