# Step 5 Preview vs Yi-Lightning

> Step 5 Preview is the stronger model overall, scoring 47.9 to 37.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/step-5-preview-vs-yi-lightning
- Last updated: 2026-10-12
- Shared benchmarks: 13

## Summary

- They share 13 benchmarks with published results for both. Step 5 Preview scores higher in 8 categories and Yi-Lightning in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where Step 5 Preview leads 51.8 to 27.4.

## Snapshot

| | Step 5 Preview | Yi-Lightning |
|---|---|---|
| Provider | StepFun | 01.AI |
| Noometry Index | 47.9 | 37.1 |
| Rank | 58 | 209 |
| Context | 1.02M | — |
| Input $/M | $1 | — |
| Output $/M | $2.70 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Step 5 Preview: 51.8 (#36)
- Yi-Lightning: 27.4 (#320)

| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Coding | 1480 | 1312 |
| Aider Polyglot | — | 12.9% |
| LMArena WebDev | 1564 | — |
| SciCode | 58.9% | — |

## Reasoning

- Step 5 Preview: 40.0 (#57)
- Yi-Lightning: 25.9 (#139)

| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | 1465 | 1302 |
| CritPt | 20.9% | — |

## Math

- Step 5 Preview: 46.1 (#72)
- Yi-Lightning: 36.2 (#172)

| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Math | 1470 | 1300 |
| ProofBench | 42% | — |

## Knowledge

- Step 5 Preview: 41.2 (#112)
- Yi-Lightning: 35.4 (#185)

| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Expert | 1470 | 1286 |

## Multimodal

- Step 5 Preview: 41.0 (#41)
- Yi-Lightning: —

| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Vision | 1267 | — |

## Multilingual

- Step 5 Preview: 53.8 (#54)
- Yi-Lightning: 42.2 (#196)

| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Non-English | 1432 | 1269 |
| LMArena Chinese | 1519 | 1320 |
| LMArena Russian | 1436 | 1255 |
| LMArena Spanish | 1439 | 1315 |
| LMArena French | — | 1305 |
| LMArena German | — | 1267 |
| LMArena Japanese | — | 1228 |
| LMArena Korean | — | 1192 |

## Instruction Following

- Step 5 Preview: 76.0 (#50)
- Yi-Lightning: 67.4 (#196)

| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | 1444 | 1278 |

## Long Context

- Step 5 Preview: 44.5 (#64)
- Yi-Lightning: 39.4 (#181)

| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | 1455 | 1297 |

## Writing & Preference

- Step 5 Preview: 62.8 (#71)
- Yi-Lightning: 50.2 (#184)

| Benchmark | Step 5 Preview | Yi-Lightning |
|---|---|---|
| LMArena Text | 1442 | 1302 |
| LMArena Creative Writing | 1410 | 1280 |
| LMArena Multi-Turn | 1447 | 1311 |

## FAQ

### Is Step 5 Preview better than Yi-Lightning?

Step 5 Preview is the stronger model overall, scoring 47.9 to 37.1 on the Noometry Index.

### Is Step 5 Preview or Yi-Lightning better for coding?

Step 5 Preview scores higher on coding benchmarks: 51.8 versus 27.4 in the Noometry coding category.

### How many benchmarks do Step 5 Preview and Yi-Lightning share?

13 benchmarks have published results for both models. Step 5 Preview has 18 scored results on Noometry and Yi-Lightning has 18.