Model comparison
GPT-5.5 Instant vs Longcat Flash Chat
GPT-5.5 Instant and Longcat Flash Chat score almost the same on the Noometry Index (42.7 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-5.5 Instant scores higher in 5 categories and Longcat Flash Chat in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where Longcat Flash Chat leads 39.4 to 26.5.
- Longcat Flash Chat has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Instant | Longcat Flash Chat | |
|---|---|---|
| Provider | OpenAI | Meituan |
| Noometry Index | 42.7 | 42.1 |
| Released | 2026-05-05 | — |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 27 | 19 |
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Category by category
Coding Too close to call
GPT-5.5 Instant: 44.3 (#74), Longcat Flash Chat: 43.5 (#87)
| Benchmark | GPT-5.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1433 | 1471 |
| SciCode | 48.6% | — |
Reasoning GPT-5.5 Instant leads
GPT-5.5 Instant: 24.9 (#155), Longcat Flash Chat: 19.0 (#272)
| Benchmark | GPT-5.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Hard Prompts | 1426 | 1440 |
| Kagi LLM Benchmark | — | 43.9% |
| NYT Connections (extended) | — | 17.7% |
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| Epoch Capabilities Index | 142.52 | — |
Math Longcat Flash Chat leads
GPT-5.5 Instant: 26.5 (#259), Longcat Flash Chat: 39.4 (#107)
| Benchmark | GPT-5.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1420 | 1442 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
Knowledge GPT-5.5 Instant leads
GPT-5.5 Instant: 48.9 (#74), Longcat Flash Chat: 40.6 (#116)
| Benchmark | GPT-5.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1409 | 1454 |
| GPQA Diamond | 82.5% | — |
Multimodal Not comparable
GPT-5.5 Instant: 40.0 (#52), Longcat Flash Chat: —
| Benchmark | GPT-5.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |
Multilingual Too close to call
GPT-5.5 Instant: 52.8 (#80), Longcat Flash Chat: 51.9 (#101)
| Benchmark | GPT-5.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1417 | 1404 |
| LMArena Chinese | 1456 | 1465 |
| LMArena French | 1428 | 1456 |
| LMArena German | 1411 | 1408 |
| LMArena Japanese | 1408 | 1373 |
| LMArena Korean | 1392 | 1371 |
| LMArena Russian | 1431 | 1395 |
| LMArena Spanish | 1429 | 1445 |
Instruction Following Too close to call
GPT-5.5 Instant: 74.2 (#100), Longcat Flash Chat: 74.4 (#96)
| Benchmark | GPT-5.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1406 | 1411 |
Long Context Too close to call
GPT-5.5 Instant: 43.4 (#96), Longcat Flash Chat: 43.5 (#93)
| Benchmark | GPT-5.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1422 | 1425 |
Writing & Preference Too close to call
GPT-5.5 Instant: 61.8 (#85), Longcat Flash Chat: 61.0 (#91)
| Benchmark | GPT-5.5 Instant | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1419 | 1427 |
| LMArena Creative Writing | 1419 | 1388 |
| LMArena Multi-Turn | 1433 | 1418 |
Frequently asked questions
Is GPT-5.5 Instant better than Longcat Flash Chat?
GPT-5.5 Instant and Longcat Flash Chat score almost the same on the Noometry Index (42.7 vs 42.1), so choose on price, context window or the category you care about most.
Is GPT-5.5 Instant or Longcat Flash Chat better for coding?
They score almost the same on coding (44.3 vs 43.5); test both on your own repository before choosing.
How many benchmarks do GPT-5.5 Instant and Longcat Flash Chat share?
17 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Longcat Flash Chat has 19.