# Solar Pro4 vs Yi-Lightning

> Solar Pro4 is the stronger model overall, scoring 42.1 to 37.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/solar-pro4-vs-yi-lightning
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Solar Pro4 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 Solar Pro4 leads 40.1 to 27.4.

## Snapshot

| | Solar Pro4 | Yi-Lightning |
|---|---|---|
| Provider | Upstage | 01.AI |
| Noometry Index | 42.1 | 37.1 |
| Rank | 121 | 209 |
| Context | 524K | — |
| Input $/M | $0.30 | — |
| Output $/M | $1.20 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Solar Pro4: 40.1 (#149)
- Yi-Lightning: 27.4 (#320)

| Benchmark | Solar Pro4 | Yi-Lightning |
|---|---|---|
| LMArena Coding | 1437 | 1312 |
| Aider Polyglot | — | 12.9% |
| LMArena WebDev | 1371 | — |

## Reasoning

- Solar Pro4: 28.5 (#104)
- Yi-Lightning: 25.9 (#139)

| Benchmark | Solar Pro4 | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1302 |

## Math

- Solar Pro4: 38.8 (#128)
- Yi-Lightning: 36.2 (#172)

| Benchmark | Solar Pro4 | Yi-Lightning |
|---|---|---|
| LMArena Math | 1416 | 1300 |

## Knowledge

- Solar Pro4: 39.8 (#129)
- Yi-Lightning: 35.4 (#185)

| Benchmark | Solar Pro4 | Yi-Lightning |
|---|---|---|
| LMArena Expert | 1427 | 1286 |

## Multilingual

- Solar Pro4: 48.7 (#139)
- Yi-Lightning: 42.2 (#196)

| Benchmark | Solar Pro4 | Yi-Lightning |
|---|---|---|
| LMArena Non-English | 1361 | 1269 |
| LMArena Chinese | 1415 | 1320 |
| LMArena French | 1397 | 1305 |
| LMArena German | 1364 | 1267 |
| LMArena Japanese | 1309 | 1228 |
| LMArena Korean | 1382 | 1192 |
| LMArena Russian | 1360 | 1255 |
| LMArena Spanish | 1401 | 1315 |

## Instruction Following

- Solar Pro4: 72.7 (#132)
- Yi-Lightning: 67.4 (#196)

| Benchmark | Solar Pro4 | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | 1377 | 1278 |

## Long Context

- Solar Pro4: 42.1 (#130)
- Yi-Lightning: 39.4 (#181)

| Benchmark | Solar Pro4 | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | 1381 | 1297 |

## Writing & Preference

- Solar Pro4: 56.5 (#138)
- Yi-Lightning: 50.2 (#184)

| Benchmark | Solar Pro4 | Yi-Lightning |
|---|---|---|
| LMArena Text | 1386 | 1302 |
| LMArena Creative Writing | 1316 | 1280 |
| LMArena Multi-Turn | 1385 | 1311 |

## FAQ

### Is Solar Pro4 better than Yi-Lightning?

Solar Pro4 is the stronger model overall, scoring 42.1 to 37.1 on the Noometry Index.

### Is Solar Pro4 or Yi-Lightning better for coding?

Solar Pro4 scores higher on coding benchmarks: 40.1 versus 27.4 in the Noometry coding category.

### How many benchmarks do Solar Pro4 and Yi-Lightning share?

17 benchmarks have published results for both models. Solar Pro4 has 18 scored results on Noometry and Yi-Lightning has 18.