# Mercury 2 vs Solar Pro4

> Solar Pro4 is the stronger model overall, scoring 41.5 to 38.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/mercury-2-vs-solar-pro4
- Last updated: 2026-10-10
- Shared benchmarks: 12

## Summary

- They share 12 benchmarks with published results for both. Mercury 2 scores higher in 0 categories and Solar Pro4 in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in coding, where Solar Pro4 leads 39.9 to 33.2.
- Mercury 2 is cheaper at $0.25 / $0.75 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
- Solar Pro4 accepts more context: 524K tokens versus 128K.

## Snapshot

| | Mercury 2 | Solar Pro4 |
|---|---|---|
| Provider | Inception | Upstage |
| Noometry Index | 38.8 | 41.5 |
| Rank | 167 | 123 |
| Context | 128K | 524K |
| Input $/M | $0.25 | $0.30 |
| Output $/M | $0.75 | $1.20 |
| Weights | Proprietary | Proprietary |

## Coding

- Mercury 2: 33.2 (#250)
- Solar Pro4: 39.9 (#135)

| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1170 | 1371 |
| LMArena Coding | 1391 | 1439 |
| SciCode | 38.7% | — |
| WeirdML | 43.2% | — |
| ALE-Bench | 785.58 | — |

## Reasoning

- Mercury 2: 23.0 (#170)
- Solar Pro4: 27.3 (#107)

| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1362 | 1398 |
| CritPt | 0.8% | — |

## Math

- Mercury 2: —
- Solar Pro4: 36.1 (#129)

| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Math | — | 1418 |

## Knowledge

- Mercury 2: 35.6 (#170)
- Solar Pro4: 39.0 (#128)

| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1358 | 1421 |
| Vectara Hallucination Rate | 12.3% | — |

## Multilingual

- Mercury 2: 46.8 (#153)
- Solar Pro4: 49.0 (#134)

| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1331 | 1362 |
| LMArena Chinese | 1416 | 1417 |
| LMArena Russian | 1303 | 1360 |
| LMArena French | — | 1403 |
| LMArena German | — | 1351 |
| LMArena Japanese | — | 1300 |
| LMArena Korean | — | 1383 |
| LMArena Spanish | — | 1408 |

## Instruction Following

- Mercury 2: 70.4 (#161)
- Solar Pro4: 72.8 (#128)

| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1328 | 1376 |

## Long Context

- Mercury 2: 40.4 (#149)
- Solar Pro4: 42.0 (#125)

| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1329 | 1379 |

## Writing & Preference

- Mercury 2: 54.0 (#151)
- Solar Pro4: 56.7 (#133)

| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Text | 1355 | 1386 |
| LMArena Creative Writing | 1289 | 1313 |
| LMArena Multi-Turn | 1358 | 1391 |

## FAQ

### Is Mercury 2 better than Solar Pro4?

Solar Pro4 is the stronger model overall, scoring 41.5 to 38.8 on the Noometry Index.

### Which is cheaper, Mercury 2 or Solar Pro4?

Mercury 2 is cheaper. It lists at $0.25 per million input tokens and $0.75 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.

### Is Mercury 2 or Solar Pro4 better for coding?

Solar Pro4 scores higher on coding benchmarks: 39.9 versus 33.2 in the Noometry coding category.

### Which has the bigger context window?

Solar Pro4 does, with 524K tokens against 128K.

### How many benchmarks do Mercury 2 and Solar Pro4 share?

12 benchmarks have published results for both models. Mercury 2 has 17 scored results on Noometry and Solar Pro4 has 18.