# Solar Pro4 vs Yi-1.5-34B

> Solar Pro4 is the stronger model overall, scoring 42.1 to 30.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/solar-pro4-vs-yi-1-5-34b
- 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-1.5-34B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Solar Pro4 leads 39.8 to 14.8.
- Yi-1.5-34B has downloadable open weights; the other is API-only.

## Snapshot

| | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| Provider | Upstage | 01.AI |
| Noometry Index | 42.1 | 30.6 |
| Rank | 121 | 289 |
| Context | 524K | — |
| Input $/M | $0.30 | — |
| Output $/M | $1.20 | — |
| Weights | Proprietary | Open |

## Coding

- Solar Pro4: 40.1 (#149)
- Yi-1.5-34B: 32.4 (#272)

| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Coding | 1437 | 1169 |
| LMArena WebDev | 1371 | — |
| BigCodeBench Instruct | — | 33.9% |
| BigCodeBench Complete | — | 43.8% |

## Reasoning

- Solar Pro4: 28.5 (#104)
- Yi-1.5-34B: 22.5 (#191)

| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1160 |

## Math

- Solar Pro4: 38.8 (#128)
- Yi-1.5-34B: 27.5 (#249)

| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Math | 1416 | 1182 |
| MATH Level 5 | — | 25.5% |

## Knowledge

- Solar Pro4: 39.8 (#129)
- Yi-1.5-34B: 14.8 (#295)

| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Expert | 1427 | 1144 |
| GPQA Diamond | — | 32% |

## Multilingual

- Solar Pro4: 48.7 (#139)
- Yi-1.5-34B: 32.3 (#256)

| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Non-English | 1361 | 1121 |
| LMArena Chinese | 1415 | 1213 |
| LMArena French | 1397 | 1156 |
| LMArena German | 1364 | 1111 |
| LMArena Japanese | 1309 | 1021 |
| LMArena Korean | 1382 | 1005 |
| LMArena Russian | 1360 | 1091 |
| LMArena Spanish | 1401 | 1121 |

## Instruction Following

- Solar Pro4: 72.7 (#132)
- Yi-1.5-34B: 59.2 (#257)

| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Instruction Following | 1377 | 1139 |

## Long Context

- Solar Pro4: 42.1 (#130)
- Yi-1.5-34B: 34.6 (#248)

| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Longer Query | 1381 | 1143 |

## Writing & Preference

- Solar Pro4: 56.5 (#138)
- Yi-1.5-34B: 37.4 (#257)

| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Text | 1386 | 1173 |
| LMArena Creative Writing | 1316 | 1135 |
| LMArena Multi-Turn | 1385 | 1153 |

## FAQ

### Is Solar Pro4 better than Yi-1.5-34B?

Solar Pro4 is the stronger model overall, scoring 42.1 to 30.6 on the Noometry Index.

### Is Solar Pro4 or Yi-1.5-34B better for coding?

Solar Pro4 scores higher on coding benchmarks: 40.1 versus 32.4 in the Noometry coding category.

### How many benchmarks do Solar Pro4 and Yi-1.5-34B share?

17 benchmarks have published results for both models. Solar Pro4 has 18 scored results on Noometry and Yi-1.5-34B has 21.