# Solar Pro4 vs Step 3.7 Flash

> Solar Pro4 is the stronger model overall, scoring 41.5 to 36.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/solar-pro4-vs-step-3-7-flash
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where Solar Pro4 leads 27.3 to 20.9.
- Step 3.7 Flash is cheaper at $0.18 / $1.11 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
- Solar Pro4 accepts more context: 524K tokens versus 256K.
- Step 3.7 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| Provider | Upstage | StepFun |
| Noometry Index | 41.5 | 36.5 |
| Rank | 123 | 207 |
| Context | 524K | 256K |
| Input $/M | $0.30 | $0.18 |
| Output $/M | $1.20 | $1.11 |
| Weights | Proprietary | Open |

## Coding

- Solar Pro4: 39.9 (#135)
- Step 3.7 Flash: 39.4 (#147)

| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| LMArena WebDev | 1371 | — |
| SciCode | — | 40% |
| LMArena Coding | 1439 | — |
| ALE-Bench | — | 694.12 |

## Reasoning

- Solar Pro4: 27.3 (#107)
- Step 3.7 Flash: 20.9 (#211)

| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| NYT Connections (extended) | — | 39.7% |
| CritPt | — | 2.3% |
| LMArena Hard Prompts | 1398 | — |

## Math

- Solar Pro4: 36.1 (#129)
- Step 3.7 Flash: 40.9 (#74)

| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | — | 68.5% |
| LMArena Math | 1418 | — |

## Knowledge

- Solar Pro4: 39.0 (#128)
- Step 3.7 Flash: —

| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| LMArena Expert | 1421 | — |

## Multilingual

- Solar Pro4: 49.0 (#134)
- Step 3.7 Flash: —

| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| LMArena Non-English | 1362 | — |
| LMArena Chinese | 1417 | — |
| LMArena French | 1403 | — |
| LMArena German | 1351 | — |
| LMArena Japanese | 1300 | — |
| LMArena Korean | 1383 | — |
| LMArena Russian | 1360 | — |
| LMArena Spanish | 1408 | — |

## Instruction Following

- Solar Pro4: 72.8 (#128)
- Step 3.7 Flash: —

| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| LMArena Instruction Following | 1376 | — |

## Long Context

- Solar Pro4: 42.0 (#125)
- Step 3.7 Flash: —

| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| LMArena Longer Query | 1379 | — |

## Writing & Preference

- Solar Pro4: 56.7 (#133)
- Step 3.7 Flash: —

| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| LMArena Text | 1386 | — |
| LMArena Creative Writing | 1313 | — |
| LMArena Multi-Turn | 1391 | — |

## FAQ

### Is Solar Pro4 better than Step 3.7 Flash?

Solar Pro4 is the stronger model overall, scoring 41.5 to 36.5 on the Noometry Index.

### Which is cheaper, Solar Pro4 or Step 3.7 Flash?

Step 3.7 Flash is cheaper. It lists at $0.18 per million input tokens and $1.11 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.

### Is Solar Pro4 or Step 3.7 Flash better for coding?

They score almost the same on coding (39.9 vs 39.4); test both on your own repository before choosing.

### Which has the bigger context window?

Solar Pro4 does, with 524K tokens against 256K.

### How many benchmarks do Solar Pro4 and Step 3.7 Flash share?

0 benchmarks have published results for both models. Solar Pro4 has 18 scored results on Noometry and Step 3.7 Flash has 5.