Model comparison
Step 5 Preview vs Yi-Lightning
Step 5 Preview is the stronger model overall, scoring 43.8 to 36.5 on the Noometry Index.
Last verified . 0 shared benchmarks.
StepFunSummary
- The widest gap is in coding, where Step 5 Preview leads 50.6 to 27.0.
Side by side
| Step 5 Preview | Yi-Lightning | |
|---|---|---|
| Provider | StepFun | 01.AI |
| Noometry Index | 43.8 | 36.5 |
| Released | 2026-09-16 | 2024-12-02 |
| Weights | Proprietary | Proprietary |
| Context window | 1.02M | — |
| Max output | 66K | — |
| Input $ / M tokens | $1 | — |
| Output $ / M tokens | $2.70 | — |
| Results tracked | 3 | 18 |
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Category by category
Coding Step 5 Preview leads
Step 5 Preview: 50.6 (#40), Yi-Lightning: 27.0 (#315)
| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| Aider Polyglot | — | 12.9% |
| LMArena WebDev | 1569 | — |
| SciCode | 58.9% | — |
| LMArena Coding | — | 1313 |
Reasoning Step 5 Preview leads
Step 5 Preview: 38.0 (#58), Yi-Lightning: 24.9 (#137)
| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| CritPt | 20.9% | — |
| LMArena Hard Prompts | — | 1302 |
Math Not comparable
Step 5 Preview: —, Yi-Lightning: 33.5 (#173)
| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Math | — | 1300 |
Knowledge Not comparable
Step 5 Preview: —, Yi-Lightning: 34.8 (#182)
| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Expert | — | 1286 |
Multilingual Not comparable
Step 5 Preview: —, Yi-Lightning: 42.4 (#191)
| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Non-English | — | 1269 |
| LMArena Chinese | — | 1320 |
| LMArena French | — | 1304 |
| LMArena German | — | 1267 |
| LMArena Japanese | — | 1228 |
| LMArena Korean | — | 1192 |
| LMArena Russian | — | 1255 |
| LMArena Spanish | — | 1315 |
Instruction Following Not comparable
Step 5 Preview: —, Yi-Lightning: 67.6 (#191)
| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | — | 1278 |
Long Context Not comparable
Step 5 Preview: —, Yi-Lightning: 39.4 (#176)
| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | — | 1297 |
Writing & Preference Not comparable
Step 5 Preview: —, Yi-Lightning: 50.4 (#178)
| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Text | — | 1302 |
| LMArena Creative Writing | — | 1280 |
| LMArena Multi-Turn | — | 1311 |
Frequently asked questions
Is Step 5 Preview better than Yi-Lightning?
Step 5 Preview is the stronger model overall, scoring 43.8 to 36.5 on the Noometry Index.
Is Step 5 Preview or Yi-Lightning better for coding?
Step 5 Preview scores higher on coding benchmarks: 50.6 versus 27.0 in the Noometry coding category.
How many benchmarks do Step 5 Preview and Yi-Lightning share?
0 benchmarks have published results for both models. Step 5 Preview has 3 scored results on Noometry and Yi-Lightning has 18.