# Step 2 16k Exp 202412 vs Yi-Lightning

> Step 2 16k Exp 202412 is the stronger model overall, scoring 39.2 to 37.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/step-2-16k-exp-202412-vs-yi-lightning
- Last updated: 2026-10-12
- Shared benchmarks: 12

## Summary

- They share 12 benchmarks with published results for both. Step 2 16k Exp 202412 scores higher in 6 categories and Yi-Lightning in 2 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in coding, where Step 2 16k Exp 202412 leads 38.5 to 27.4.

## Snapshot

| | Step 2 16k Exp 202412 | Yi-Lightning |
|---|---|---|
| Provider | StepFun | 01.AI |
| Noometry Index | 39.2 | 37.1 |
| Rank | 171 | 209 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- Step 2 16k Exp 202412: 38.5 (#174)
- Yi-Lightning: 27.4 (#320)

| Benchmark | Step 2 16k Exp 202412 | Yi-Lightning |
|---|---|---|
| LMArena Coding | 1316 | 1312 |
| Aider Polyglot | — | 12.9% |

## Reasoning

- Step 2 16k Exp 202412: 25.9 (#142)
- Yi-Lightning: 25.9 (#139)

| Benchmark | Step 2 16k Exp 202412 | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | 1299 | 1302 |

## Math

- Step 2 16k Exp 202412: 36.3 (#169)
- Yi-Lightning: 36.2 (#172)

| Benchmark | Step 2 16k Exp 202412 | Yi-Lightning |
|---|---|---|
| LMArena Math | 1304 | 1300 |

## Knowledge

- Step 2 16k Exp 202412: 35.2 (#187)
- Yi-Lightning: 35.4 (#185)

| Benchmark | Step 2 16k Exp 202412 | Yi-Lightning |
|---|---|---|
| LMArena Expert | 1279 | 1286 |

## Multilingual

- Step 2 16k Exp 202412: 43.7 (#181)
- Yi-Lightning: 42.2 (#196)

| Benchmark | Step 2 16k Exp 202412 | Yi-Lightning |
|---|---|---|
| LMArena Non-English | 1290 | 1269 |
| LMArena Chinese | 1331 | 1320 |
| LMArena Russian | 1324 | 1255 |
| LMArena French | — | 1305 |
| LMArena German | — | 1267 |
| LMArena Japanese | — | 1228 |
| LMArena Korean | — | 1192 |
| LMArena Spanish | — | 1315 |

## Instruction Following

- Step 2 16k Exp 202412: 67.9 (#192)
- Yi-Lightning: 67.4 (#196)

| Benchmark | Step 2 16k Exp 202412 | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | 1287 | 1278 |

## Long Context

- Step 2 16k Exp 202412: 39.7 (#170)
- Yi-Lightning: 39.4 (#181)

| Benchmark | Step 2 16k Exp 202412 | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | 1307 | 1297 |

## Writing & Preference

- Step 2 16k Exp 202412: 52.3 (#173)
- Yi-Lightning: 50.2 (#184)

| Benchmark | Step 2 16k Exp 202412 | Yi-Lightning |
|---|---|---|
| LMArena Text | 1321 | 1302 |
| LMArena Creative Writing | 1328 | 1280 |
| LMArena Multi-Turn | 1292 | 1311 |

## FAQ

### Is Step 2 16k Exp 202412 better than Yi-Lightning?

Step 2 16k Exp 202412 is the stronger model overall, scoring 39.2 to 37.1 on the Noometry Index.

### Is Step 2 16k Exp 202412 or Yi-Lightning better for coding?

Step 2 16k Exp 202412 scores higher on coding benchmarks: 38.5 versus 27.4 in the Noometry coding category.

### How many benchmarks do Step 2 16k Exp 202412 and Yi-Lightning share?

12 benchmarks have published results for both models. Step 2 16k Exp 202412 has 12 scored results on Noometry and Yi-Lightning has 18.