Model comparison
Step 1o Turbo 202506 vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 43.8 to 39.1 on the Noometry Index.
Last verified . 0 shared benchmarks.
StepFunSummary
- The widest gap is in reasoning, where Step 5 Preview leads 38.0 to 25.7.
Side by side
| Step 1o Turbo 202506 | Step 5 Preview | |
|---|---|---|
| Provider | StepFun | StepFun |
| Noometry Index | 39.1 | 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 | 14 | 3 |
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Category by category
Coding Step 5 Preview leads
Step 1o Turbo 202506: 38.6 (#158), Step 5 Preview: 50.6 (#40)
| Benchmark | Step 1o Turbo 202506 | Step 5 Preview |
|---|---|---|
| LMArena WebDev | — | 1569 |
| SciCode | — | 58.9% |
| LMArena Coding | 1339 | — |
Reasoning Step 5 Preview leads
Step 1o Turbo 202506: 25.7 (#127), Step 5 Preview: 38.0 (#58)
| Benchmark | Step 1o Turbo 202506 | Step 5 Preview |
|---|---|---|
| CritPt | — | 20.9% |
| LMArena Hard Prompts | 1336 | — |
Math Not comparable
Step 1o Turbo 202506: 33.9 (#163), Step 5 Preview: —
| Benchmark | Step 1o Turbo 202506 | Step 5 Preview |
|---|---|---|
| LMArena Math | 1318 | — |
Knowledge Not comparable
Step 1o Turbo 202506: 35.5 (#174), Step 5 Preview: —
| Benchmark | Step 1o Turbo 202506 | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1308 | — |
Multimodal Not comparable
Step 1o Turbo 202506: 35.4 (#75), Step 5 Preview: —
| Benchmark | Step 1o Turbo 202506 | Step 5 Preview |
|---|---|---|
| LMArena Vision | 1186 | — |
Multilingual Not comparable
Step 1o Turbo 202506: 45.5 (#168), Step 5 Preview: —
| Benchmark | Step 1o Turbo 202506 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1313 | — |
| LMArena Chinese | 1380 | — |
| LMArena German | 1315 | — |
| LMArena Russian | 1327 | — |
Instruction Following Not comparable
Step 1o Turbo 202506: 69.4 (#171), Step 5 Preview: —
| Benchmark | Step 1o Turbo 202506 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1311 | — |
Long Context Not comparable
Step 1o Turbo 202506: 41.1 (#141), Step 5 Preview: —
| Benchmark | Step 1o Turbo 202506 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1350 | — |
Writing & Preference Not comparable
Step 1o Turbo 202506: 53.4 (#154), Step 5 Preview: —
| Benchmark | Step 1o Turbo 202506 | Step 5 Preview |
|---|---|---|
| LMArena Text | 1336 | — |
| LMArena Creative Writing | 1308 | — |
| LMArena Multi-Turn | 1341 | — |
Frequently asked questions
Is Step 1o Turbo 202506 better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 43.8 to 39.1 on the Noometry Index.
Is Step 1o Turbo 202506 or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 50.6 versus 38.6 in the Noometry coding category.
How many benchmarks do Step 1o Turbo 202506 and Step 5 Preview share?
0 benchmarks have published results for both models. Step 1o Turbo 202506 has 14 scored results on Noometry and Step 5 Preview has 3.