Model comparison
Step 2 16k Exp 202412 vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 43.8 to 38.6 on the Noometry Index.
Last verified . 0 shared benchmarks.
StepFunSummary
- The widest gap is in reasoning, where Step 5 Preview leads 38.0 to 24.8.
Side by side
| Step 2 16k Exp 202412 | Step 5 Preview | |
|---|---|---|
| Provider | StepFun | StepFun |
| Noometry Index | 38.6 | 43.8 |
| Released | — | 2026-09-16 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.02M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1 |
| Output $ / M tokens | — | $2.70 |
| Results tracked | 12 | 3 |
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Category by category
Coding Step 5 Preview leads
Step 2 16k Exp 202412: 37.9 (#170), Step 5 Preview: 50.6 (#40)
| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena WebDev | — | 1569 |
| SciCode | — | 58.9% |
| LMArena Coding | 1316 | — |
Reasoning Step 5 Preview leads
Step 2 16k Exp 202412: 24.8 (#140), Step 5 Preview: 38.0 (#58)
| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| CritPt | — | 20.9% |
| LMArena Hard Prompts | 1299 | — |
Math Not comparable
Step 2 16k Exp 202412: 33.6 (#171), Step 5 Preview: —
| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena Math | 1305 | — |
Knowledge Not comparable
Step 2 16k Exp 202412: 34.6 (#187), Step 5 Preview: —
| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1279 | — |
Multilingual Not comparable
Step 2 16k Exp 202412: 43.9 (#176), Step 5 Preview: —
| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1290 | — |
| LMArena Chinese | 1331 | — |
| LMArena Russian | 1324 | — |
Instruction Following Not comparable
Step 2 16k Exp 202412: 68.1 (#187), Step 5 Preview: —
| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1287 | — |
Long Context Not comparable
Step 2 16k Exp 202412: 39.7 (#165), Step 5 Preview: —
| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1307 | — |
Writing & Preference Not comparable
Step 2 16k Exp 202412: 52.5 (#168), Step 5 Preview: —
| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena Text | 1321 | — |
| LMArena Creative Writing | 1328 | — |
| LMArena Multi-Turn | 1292 | — |
Frequently asked questions
Is Step 2 16k Exp 202412 better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 43.8 to 38.6 on the Noometry Index.
Is Step 2 16k Exp 202412 or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 50.6 versus 37.9 in the Noometry coding category.
How many benchmarks do Step 2 16k Exp 202412 and Step 5 Preview share?
0 benchmarks have published results for both models. Step 2 16k Exp 202412 has 12 scored results on Noometry and Step 5 Preview has 3.