Model comparison
Longcat Flash Chat vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 47.9 to 42.1 on the Noometry Index.
Last verified . 13 shared benchmarks.
StepFunSummary
- They share 13 benchmarks with published results for both. Longcat Flash Chat scores higher in 0 categories and Step 5 Preview in 8 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Step 5 Preview leads 40.0 to 19.0.
- Longcat Flash Chat has downloadable open weights; the other is API-only.
Side by side
| Longcat Flash Chat | Step 5 Preview | |
|---|---|---|
| Provider | Meituan | StepFun |
| Noometry Index | 42.1 | 47.9 |
| Released | — | 2026-09-16 |
| Weights | Open | Proprietary |
| Context window | — | 1.02M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1 |
| Output $ / M tokens | — | $2.70 |
| Results tracked | 19 | 18 |
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Category by category
Coding Step 5 Preview leads
Longcat Flash Chat: 43.5 (#87), Step 5 Preview: 51.8 (#36)
| Benchmark | Longcat Flash Chat | Step 5 Preview |
|---|---|---|
| LMArena Coding | 1471 | 1480 |
| LMArena WebDev | — | 1564 |
| SciCode | — | 58.9% |
Reasoning Step 5 Preview leads
Longcat Flash Chat: 19.0 (#272), Step 5 Preview: 40.0 (#57)
| Benchmark | Longcat Flash Chat | Step 5 Preview |
|---|---|---|
| LMArena Hard Prompts | 1440 | 1465 |
| Kagi LLM Benchmark | 43.9% | — |
| NYT Connections (extended) | 17.7% | — |
| CritPt | — | 20.9% |
Math Step 5 Preview leads
Longcat Flash Chat: 39.4 (#107), Step 5 Preview: 46.1 (#72)
| Benchmark | Longcat Flash Chat | Step 5 Preview |
|---|---|---|
| LMArena Math | 1442 | 1470 |
| ProofBench | — | 42% |
Knowledge Too close to call
Longcat Flash Chat: 40.6 (#116), Step 5 Preview: 41.2 (#112)
| Benchmark | Longcat Flash Chat | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1454 | 1470 |
Multimodal Not comparable
Longcat Flash Chat: —, Step 5 Preview: 41.0 (#41)
| Benchmark | Longcat Flash Chat | Step 5 Preview |
|---|---|---|
| LMArena Vision | — | 1267 |
Multilingual Step 5 Preview leads
Longcat Flash Chat: 51.9 (#101), Step 5 Preview: 53.8 (#54)
| Benchmark | Longcat Flash Chat | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1404 | 1432 |
| LMArena Chinese | 1465 | 1519 |
| LMArena Russian | 1395 | 1436 |
| LMArena Spanish | 1445 | 1439 |
| LMArena French | 1456 | — |
| LMArena German | 1408 | — |
| LMArena Japanese | 1373 | — |
| LMArena Korean | 1371 | — |
Instruction Following Step 5 Preview leads
Longcat Flash Chat: 74.4 (#96), Step 5 Preview: 76.0 (#50)
| Benchmark | Longcat Flash Chat | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1411 | 1444 |
Long Context Too close to call
Longcat Flash Chat: 43.5 (#93), Step 5 Preview: 44.5 (#64)
| Benchmark | Longcat Flash Chat | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1425 | 1455 |
Writing & Preference Step 5 Preview leads
Longcat Flash Chat: 61.0 (#91), Step 5 Preview: 62.8 (#71)
| Benchmark | Longcat Flash Chat | Step 5 Preview |
|---|---|---|
| LMArena Text | 1427 | 1442 |
| LMArena Creative Writing | 1388 | 1410 |
| LMArena Multi-Turn | 1418 | 1447 |
Frequently asked questions
Is Longcat Flash Chat better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 47.9 to 42.1 on the Noometry Index.
Is Longcat Flash Chat or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 43.5 in the Noometry coding category.
How many benchmarks do Longcat Flash Chat and Step 5 Preview share?
13 benchmarks have published results for both models. Longcat Flash Chat has 19 scored results on Noometry and Step 5 Preview has 18.