Model comparison
Longcat Flash Chat vs Step 3.5 Flash
Longcat Flash Chat and Step 3.5 Flash score almost the same on the Noometry Index (42.1 vs 42.3), so choose on price, context window or the category you care about most.
Last verified . 18 shared benchmarks.
StepFunSummary
- They share 18 benchmarks with published results for both. Longcat Flash Chat scores higher in 6 categories and Step 3.5 Flash in 2 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where Step 3.5 Flash leads 42.6 to 39.4.
- The biggest single-benchmark swing is NYT Connections (extended): 17.7% for Longcat Flash Chat and 28.4% for Step 3.5 Flash.
Side by side
| Longcat Flash Chat | Step 3.5 Flash | |
|---|---|---|
| Provider | Meituan | StepFun |
| Noometry Index | 42.1 | 42.3 |
| Released | — | 2026-01-29 |
| Weights | Open | Open |
| Context window | — | 256K |
| Max output | — | 256K |
| Input $ / M tokens | — | $0.10 |
| Output $ / M tokens | — | $0.30 |
| Results tracked | 19 | 19 |
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Category by category
Coding Longcat Flash Chat leads
Longcat Flash Chat: 43.5 (#87), Step 3.5 Flash: 42.4 (#105)
| Benchmark | Longcat Flash Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1471 | 1436 |
Reasoning Step 3.5 Flash leads
Longcat Flash Chat: 19.0 (#272), Step 3.5 Flash: 22.2 (#202)
| Benchmark | Longcat Flash Chat | Step 3.5 Flash |
|---|---|---|
| NYT Connections (extended) | 17.7% | 28.4% |
| LMArena Hard Prompts | 1440 | 1411 |
| Kagi LLM Benchmark | 43.9% | — |
Math Step 3.5 Flash leads
Longcat Flash Chat: 39.4 (#107), Step 3.5 Flash: 42.6 (#84)
| Benchmark | Longcat Flash Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1442 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |
Knowledge Longcat Flash Chat leads
Longcat Flash Chat: 40.6 (#116), Step 3.5 Flash: 39.6 (#132)
| Benchmark | Longcat Flash Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1454 | 1421 |
Multilingual Longcat Flash Chat leads
Longcat Flash Chat: 51.9 (#101), Step 3.5 Flash: 50.5 (#119)
| Benchmark | Longcat Flash Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1404 | 1385 |
| LMArena Chinese | 1465 | 1447 |
| LMArena French | 1456 | 1421 |
| LMArena German | 1408 | 1405 |
| LMArena Japanese | 1373 | 1354 |
| LMArena Korean | 1371 | 1352 |
| LMArena Russian | 1395 | 1385 |
| LMArena Spanish | 1445 | 1419 |
Instruction Following Longcat Flash Chat leads
Longcat Flash Chat: 74.4 (#96), Step 3.5 Flash: 73.1 (#124)
| Benchmark | Longcat Flash Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1411 | 1385 |
Long Context Too close to call
Longcat Flash Chat: 43.5 (#93), Step 3.5 Flash: 42.8 (#117)
| Benchmark | Longcat Flash Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1425 | 1402 |
Writing & Preference Longcat Flash Chat leads
Longcat Flash Chat: 61.0 (#91), Step 3.5 Flash: 58.8 (#113)
| Benchmark | Longcat Flash Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1427 | 1403 |
| LMArena Creative Writing | 1388 | 1357 |
| LMArena Multi-Turn | 1418 | 1405 |
Frequently asked questions
Is Longcat Flash Chat better than Step 3.5 Flash?
Longcat Flash Chat and Step 3.5 Flash score almost the same on the Noometry Index (42.1 vs 42.3), so choose on price, context window or the category you care about most.
Is Longcat Flash Chat or Step 3.5 Flash better for coding?
Longcat Flash Chat scores higher on coding benchmarks: 43.5 versus 42.4 in the Noometry coding category.
How many benchmarks do Longcat Flash Chat and Step 3.5 Flash share?
18 benchmarks have published results for both models. Longcat Flash Chat has 19 scored results on Noometry and Step 3.5 Flash has 19.