Model comparison
Longcat Flash Chat vs Step 2 16k Exp 202412
Longcat Flash Chat is the stronger model overall, scoring 41.5 to 38.6 on the Noometry Index.
Last verified . 12 shared benchmarks.
StepFunSummary
- They share 12 benchmarks with published results for both. Longcat Flash Chat scores higher in 7 categories and Step 2 16k Exp 202412 in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Longcat Flash Chat leads 61.2 to 52.5.
- Longcat Flash Chat has downloadable open weights; the other is API-only.
Side by side
| Longcat Flash Chat | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | Meituan | StepFun |
| Noometry Index | 41.5 | 38.6 |
| Released | — | — |
| Weights | Open | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 19 | 12 |
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Category by category
Coding Longcat Flash Chat leads
Longcat Flash Chat: 42.9 (#85), Step 2 16k Exp 202412: 37.9 (#170)
| Benchmark | Longcat Flash Chat | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1471 | 1316 |
Reasoning Step 2 16k Exp 202412 leads
Longcat Flash Chat: 18.3 (#267), Step 2 16k Exp 202412: 24.8 (#140)
| Benchmark | Longcat Flash Chat | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1440 | 1299 |
| Kagi LLM Benchmark | 43.9% | — |
| NYT Connections (extended) | 17.7% | — |
Math Longcat Flash Chat leads
Longcat Flash Chat: 36.6 (#107), Step 2 16k Exp 202412: 33.6 (#171)
| Benchmark | Longcat Flash Chat | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1441 | 1305 |
Knowledge Longcat Flash Chat leads
Longcat Flash Chat: 40.0 (#111), Step 2 16k Exp 202412: 34.6 (#187)
| Benchmark | Longcat Flash Chat | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1454 | 1279 |
Multilingual Longcat Flash Chat leads
Longcat Flash Chat: 52.1 (#95), Step 2 16k Exp 202412: 43.9 (#176)
| Benchmark | Longcat Flash Chat | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1404 | 1290 |
| LMArena Chinese | 1465 | 1331 |
| LMArena Russian | 1396 | 1324 |
| LMArena French | 1457 | — |
| LMArena German | 1409 | — |
| LMArena Japanese | 1373 | — |
| LMArena Korean | 1372 | — |
| LMArena Spanish | 1445 | — |
Instruction Following Longcat Flash Chat leads
Longcat Flash Chat: 74.6 (#92), Step 2 16k Exp 202412: 68.1 (#187)
| Benchmark | Longcat Flash Chat | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1411 | 1287 |
Long Context Longcat Flash Chat leads
Longcat Flash Chat: 43.5 (#89), Step 2 16k Exp 202412: 39.7 (#165)
| Benchmark | Longcat Flash Chat | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1425 | 1307 |
Writing & Preference Longcat Flash Chat leads
Longcat Flash Chat: 61.2 (#88), Step 2 16k Exp 202412: 52.5 (#168)
| Benchmark | Longcat Flash Chat | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1427 | 1321 |
| LMArena Creative Writing | 1388 | 1328 |
| LMArena Multi-Turn | 1418 | 1292 |
Frequently asked questions
Is Longcat Flash Chat better than Step 2 16k Exp 202412?
Longcat Flash Chat is the stronger model overall, scoring 41.5 to 38.6 on the Noometry Index.
Is Longcat Flash Chat or Step 2 16k Exp 202412 better for coding?
Longcat Flash Chat scores higher on coding benchmarks: 42.9 versus 37.9 in the Noometry coding category.
How many benchmarks do Longcat Flash Chat and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. Longcat Flash Chat has 19 scored results on Noometry and Step 2 16k Exp 202412 has 12.