# Mercury 2.5 vs Solar Pro4

> Solar Pro4 is the stronger model overall, scoring 42.1 to 33.5 on the Noometry Index. Mercury 2.5 costs 7.8× less per token, which makes it the better buy when Solar Pro4's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/mercury-2-5-vs-solar-pro4
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where Solar Pro4 leads 38.8 to 23.3.
- Mercury 2.5 is cheaper at $0.04 / $0.15 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
- Solar Pro4 accepts more context: 524K tokens versus 260K.

## Snapshot

| | Mercury 2.5 | Solar Pro4 |
|---|---|---|
| Provider | Inception | Upstage |
| Noometry Index | 33.5 | 42.1 |
| Rank | 242 | 121 |
| Context | 260K | 524K |
| Input $/M | $0.04 | $0.30 |
| Output $/M | $0.15 | $1.20 |
| Weights | Proprietary | Proprietary |

## Coding

- Mercury 2.5: 39.5 (#156)
- Solar Pro4: 40.1 (#149)

| Benchmark | Mercury 2.5 | Solar Pro4 |
|---|---|---|
| LMArena WebDev | — | 1371 |
| SciCode | 38.5% | — |
| LMArena Coding | — | 1437 |
| ALE-Bench | 301.65 | — |

## Reasoning

- Mercury 2.5: 22.4 (#193)
- Solar Pro4: 28.5 (#104)

| Benchmark | Mercury 2.5 | Solar Pro4 |
|---|---|---|
| CritPt | 0% | — |
| LMArena Hard Prompts | — | 1399 |

## Math

- Mercury 2.5: 23.3 (#272)
- Solar Pro4: 38.8 (#128)

| Benchmark | Mercury 2.5 | Solar Pro4 |
|---|---|---|
| ProofBench | 3% | — |
| LMArena Math | — | 1416 |

## Knowledge

- Mercury 2.5: —
- Solar Pro4: 39.8 (#129)

| Benchmark | Mercury 2.5 | Solar Pro4 |
|---|---|---|
| LMArena Expert | — | 1427 |

## Multilingual

- Mercury 2.5: —
- Solar Pro4: 48.7 (#139)

| Benchmark | Mercury 2.5 | Solar Pro4 |
|---|---|---|
| LMArena Non-English | — | 1361 |
| LMArena Chinese | — | 1415 |
| LMArena French | — | 1397 |
| LMArena German | — | 1364 |
| LMArena Japanese | — | 1309 |
| LMArena Korean | — | 1382 |
| LMArena Russian | — | 1360 |
| LMArena Spanish | — | 1401 |

## Instruction Following

- Mercury 2.5: —
- Solar Pro4: 72.7 (#132)

| Benchmark | Mercury 2.5 | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | — | 1377 |

## Long Context

- Mercury 2.5: —
- Solar Pro4: 42.1 (#130)

| Benchmark | Mercury 2.5 | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | — | 1381 |

## Writing & Preference

- Mercury 2.5: —
- Solar Pro4: 56.5 (#138)

| Benchmark | Mercury 2.5 | Solar Pro4 |
|---|---|---|
| LMArena Text | — | 1386 |
| LMArena Creative Writing | — | 1316 |
| LMArena Multi-Turn | — | 1385 |

## FAQ

### Is Mercury 2.5 better than Solar Pro4?

Solar Pro4 is the stronger model overall, scoring 42.1 to 33.5 on the Noometry Index. Mercury 2.5 costs 7.8× less per token, which makes it the better buy when Solar Pro4's lead doesn't matter for your workload.

### Which is cheaper, Mercury 2.5 or Solar Pro4?

Mercury 2.5 is cheaper. It lists at $0.04 per million input tokens and $0.15 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.

### Is Mercury 2.5 or Solar Pro4 better for coding?

They score almost the same on coding (39.5 vs 40.1); test both on your own repository before choosing.

### Which has the bigger context window?

Solar Pro4 does, with 524K tokens against 260K.

### How many benchmarks do Mercury 2.5 and Solar Pro4 share?

0 benchmarks have published results for both models. Mercury 2.5 has 4 scored results on Noometry and Solar Pro4 has 18.