# Solar Pro4 vs Step 3

> Solar Pro4 is the stronger model overall, scoring 42.1 to 40.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/solar-pro4-vs-step-3
- Last updated: 2026-10-10
- Shared benchmarks: 15

## Summary

- They share 15 benchmarks with published results for both. Solar Pro4 scores higher in 7 categories and Step 3 in 1 category; 6 gaps are clear of the uncertainty.
- Step 3 has downloadable open weights; the other is API-only.

## Snapshot

| | Solar Pro4 | Step 3 |
|---|---|---|
| Provider | Upstage | StepFun |
| Noometry Index | 42.1 | 40.5 |
| Rank | 121 | 149 |
| Context | 524K | — |
| Input $/M | $0.30 | — |
| Output $/M | $1.20 | — |
| Weights | Proprietary | Open |

## Coding

- Solar Pro4: 40.1 (#149)
- Step 3: 40.1 (#147)

| Benchmark | Solar Pro4 | Step 3 |
|---|---|---|
| LMArena Coding | 1437 | 1367 |
| LMArena WebDev | 1371 | — |

## Reasoning

- Solar Pro4: 28.5 (#104)
- Step 3: 28.4 (#105)

| Benchmark | Solar Pro4 | Step 3 |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1355 |
| Kagi LLM Benchmark | — | 62.3% |

## Math

- Solar Pro4: 38.8 (#128)
- Step 3: 37.6 (#148)

| Benchmark | Solar Pro4 | Step 3 |
|---|---|---|
| LMArena Math | 1416 | 1366 |

## Knowledge

- Solar Pro4: 39.8 (#129)
- Step 3: 36.8 (#164)

| Benchmark | Solar Pro4 | Step 3 |
|---|---|---|
| LMArena Expert | 1427 | 1333 |

## Multimodal

- Solar Pro4: —
- Step 3: 35.5 (#86)

| Benchmark | Solar Pro4 | Step 3 |
|---|---|---|
| LMArena Vision | — | 1177 |

## Multilingual

- Solar Pro4: 48.7 (#139)
- Step 3: 46.3 (#159)

| Benchmark | Solar Pro4 | Step 3 |
|---|---|---|
| LMArena Non-English | 1361 | 1327 |
| LMArena Chinese | 1415 | 1397 |
| LMArena German | 1364 | 1371 |
| LMArena Korean | 1382 | 1269 |
| LMArena Russian | 1360 | 1331 |
| LMArena Spanish | 1401 | 1371 |
| LMArena French | 1397 | — |
| LMArena Japanese | 1309 | — |

## Instruction Following

- Solar Pro4: 72.7 (#132)
- Step 3: 70.4 (#164)

| Benchmark | Solar Pro4 | Step 3 |
|---|---|---|
| LMArena Instruction Following | 1377 | 1332 |

## Long Context

- Solar Pro4: 42.1 (#130)
- Step 3: 40.3 (#157)

| Benchmark | Solar Pro4 | Step 3 |
|---|---|---|
| LMArena Longer Query | 1381 | 1326 |

## Writing & Preference

- Solar Pro4: 56.5 (#138)
- Step 3: 54.3 (#151)

| Benchmark | Solar Pro4 | Step 3 |
|---|---|---|
| LMArena Text | 1386 | 1350 |
| LMArena Creative Writing | 1316 | 1321 |
| LMArena Multi-Turn | 1385 | 1341 |

## FAQ

### Is Solar Pro4 better than Step 3?

Solar Pro4 is the stronger model overall, scoring 42.1 to 40.5 on the Noometry Index.

### Is Solar Pro4 or Step 3 better for coding?

They score almost the same on coding (40.1 vs 40.1); test both on your own repository before choosing.

### How many benchmarks do Solar Pro4 and Step 3 share?

15 benchmarks have published results for both models. Solar Pro4 has 18 scored results on Noometry and Step 3 has 17.