# Solar Pro4 vs Yi-34B

> Solar Pro4 is the stronger model overall, scoring 41.5 to 27.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/solar-pro4-vs-yi-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-34B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Solar Pro4 leads 39.0 to 7.5.
- Yi-34B has downloadable open weights; the other is API-only.

## Snapshot

| | Solar Pro4 | Yi-34B |
|---|---|---|
| Provider | Upstage | 01.AI |
| Noometry Index | 41.5 | 27.4 |
| Rank | 123 | 325 |
| Context | 524K | — |
| Input $/M | $0.30 | — |
| Output $/M | $1.20 | — |
| Weights | Proprietary | Open |

## Coding

- Solar Pro4: 39.9 (#135)
- Yi-34B: 31.8 (#269)

| Benchmark | Solar Pro4 | Yi-34B |
|---|---|---|
| LMArena Coding | 1439 | 1112 |
| LMArena WebDev | 1371 | — |

## Reasoning

- Solar Pro4: 27.3 (#107)
- Yi-34B: 20.3 (#222)

| Benchmark | Solar Pro4 | Yi-34B |
|---|---|---|
| LMArena Hard Prompts | 1398 | 1104 |
| BIG-Bench Hard | — | 71.7% |
| Epoch Capabilities Index | — | 117.28 |

## Math

- Solar Pro4: 36.1 (#129)
- Yi-34B: 19.8 (#277)

| Benchmark | Solar Pro4 | Yi-34B |
|---|---|---|
| LMArena Math | 1418 | 1114 |
| MATH Level 5 | — | 5.1% |
| GSM8K | — | 76% |

## Knowledge

- Solar Pro4: 39.0 (#128)
- Yi-34B: 7.5 (#304)

| Benchmark | Solar Pro4 | Yi-34B |
|---|---|---|
| LMArena Expert | 1421 | 1061 |
| GPQA Diamond | — | 14.7% |
| MMLU | — | 76.3% |

## Multilingual

- Solar Pro4: 49.0 (#134)
- Yi-34B: 29.9 (#259)

| Benchmark | Solar Pro4 | Yi-34B |
|---|---|---|
| LMArena Non-English | 1362 | 1079 |
| LMArena Chinese | 1417 | 1175 |
| LMArena French | 1403 | 1080 |
| LMArena German | 1351 | 1042 |
| LMArena Japanese | 1300 | 993 |
| LMArena Korean | 1383 | 959 |
| LMArena Russian | 1360 | 1050 |
| LMArena Spanish | 1408 | 1070 |

## Instruction Following

- Solar Pro4: 72.8 (#128)
- Yi-34B: 56.4 (#269)

| Benchmark | Solar Pro4 | Yi-34B |
|---|---|---|
| LMArena Instruction Following | 1376 | 1091 |

## Long Context

- Solar Pro4: 42.0 (#125)
- Yi-34B: 33.2 (#259)

| Benchmark | Solar Pro4 | Yi-34B |
|---|---|---|
| LMArena Longer Query | 1379 | 1094 |

## Writing & Preference

- Solar Pro4: 56.7 (#133)
- Yi-34B: 34.3 (#268)

| Benchmark | Solar Pro4 | Yi-34B |
|---|---|---|
| LMArena Text | 1386 | 1129 |
| LMArena Creative Writing | 1313 | 1108 |
| LMArena Multi-Turn | 1391 | 1113 |

## FAQ

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

Solar Pro4 is the stronger model overall, scoring 41.5 to 27.4 on the Noometry Index.

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

Solar Pro4 scores higher on coding benchmarks: 39.9 versus 31.8 in the Noometry coding category.

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

17 benchmarks have published results for both models. Solar Pro4 has 18 scored results on Noometry and Yi-34B has 23.