Model comparison
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 42.1), so choose on price, context window or the category you care about most.
Last verified . 18 shared benchmarks.
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 writing & preference, where Longcat Flash Chat leads 61.0 to 55.7.
- Longcat Flash Chat has downloadable open weights; the other is API-only.
Side by side
| GPT-5.4 nano | Longcat Flash Chat | |
|---|---|---|
| Provider | OpenAI | Meituan |
| Noometry Index | 41.9 | 42.1 |
| Released | 2026-03-17 | — |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.20 | — |
| Output $ / M tokens | $1.25 | — |
| Results tracked | 40 | 19 |
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Category by category
Coding Too close to call
GPT-5.4 nano: 43.6 (#84), Longcat Flash Chat: 43.5 (#87)
| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1405 | 1471 |
| SciCode | 46.9% | — |
| WeirdML | 49.2% | — |
| ALE-Bench | 1,005 | — |
Reasoning GPT-5.4 nano leads
GPT-5.4 nano: 23.7 (#173), Longcat Flash Chat: 19.0 (#272)
| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| Kagi LLM Benchmark | 39.7% | 43.9% |
| LMArena Hard Prompts | 1381 | 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 | 145.81 | — |
| ForecastBench | 57.3 | — |
Math GPT-5.4 nano leads
GPT-5.4 nano: 40.9 (#88), Longcat Flash Chat: 39.4 (#107)
| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1406 | 1442 |
| 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 leads
GPT-5.4 nano: 41.9 (#103), Longcat Flash Chat: 40.6 (#116)
| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1396 | 1454 |
| GPQA Diamond | 78.5% | — |
| SimpleQA Verified | 11.7% | — |
| Vectara Hallucination Rate | 3.1% | — |
Multimodal Not comparable
GPT-5.4 nano: 36.7 (#78), Longcat Flash Chat: —
| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Vision | 1196 | — |
Multilingual Longcat Flash Chat leads
GPT-5.4 nano: 48.6 (#140), Longcat Flash Chat: 51.9 (#101)
| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1359 | 1404 |
| LMArena Chinese | 1392 | 1465 |
| LMArena French | 1396 | 1456 |
| LMArena German | 1367 | 1408 |
| LMArena Japanese | 1343 | 1373 |
| LMArena Korean | 1320 | 1371 |
| LMArena Russian | 1363 | 1395 |
| LMArena Spanish | 1371 | 1445 |
Instruction Following Longcat Flash Chat leads
GPT-5.4 nano: 71.9 (#144), Longcat Flash Chat: 74.4 (#96)
| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1362 | 1411 |
Long Context Longcat Flash Chat leads
GPT-5.4 nano: 41.6 (#137), Longcat Flash Chat: 43.5 (#93)
| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1366 | 1425 |
Writing & Preference Longcat Flash Chat leads
GPT-5.4 nano: 55.7 (#142), Longcat Flash Chat: 61.0 (#91)
| Benchmark | GPT-5.4 nano | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1372 | 1427 |
| LMArena Creative Writing | 1314 | 1388 |
| LMArena Multi-Turn | 1382 | 1418 |
Frequently asked questions
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 42.1), 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 (43.6 vs 43.5); 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.