Model comparison
Mercury 2 vs Solar Pro4
Solar Pro4 is the stronger model overall, scoring 42.1 to 39.1 on the Noometry Index.
Last verified . 12 shared benchmarks.
UpstageSummary
- 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 40.1 to 33.5.
- 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.
Side by side
| Mercury 2 | Solar Pro4 | |
|---|---|---|
| Provider | Inception | Upstage |
| Noometry Index | 39.1 | 42.1 |
| Released | 2026-02-20 | 2026-08-06 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | 524K |
| Max output | 50K | 131K |
| Input $ / M tokens | $0.25 | $0.30 |
| Output $ / M tokens | $0.75 | $1.20 |
| Results tracked | 17 | 18 |
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Category by category
Coding Solar Pro4 leads
Mercury 2: 33.5 (#255), Solar Pro4: 40.1 (#149)
| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1171 | 1371 |
| LMArena Coding | 1391 | 1437 |
| SciCode | 38.7% | — |
| WeirdML | 43.2% | — |
| ALE-Bench | 785.58 | — |
Reasoning Solar Pro4 leads
Mercury 2: 23.8 (#170), Solar Pro4: 28.5 (#104)
| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1362 | 1399 |
| CritPt | 0.8% | — |
Math Not comparable
Mercury 2: —, Solar Pro4: 38.8 (#128)
| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Math | — | 1416 |
Knowledge Solar Pro4 leads
Mercury 2: 36.2 (#172), Solar Pro4: 39.8 (#129)
| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1358 | 1427 |
| Vectara Hallucination Rate | 12.3% | — |
Multilingual Solar Pro4 leads
Mercury 2: 46.6 (#157), Solar Pro4: 48.7 (#139)
| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1331 | 1361 |
| LMArena Chinese | 1417 | 1415 |
| LMArena Russian | 1304 | 1360 |
| LMArena French | — | 1397 |
| LMArena German | — | 1364 |
| LMArena Japanese | — | 1309 |
| LMArena Korean | — | 1382 |
| LMArena Spanish | — | 1401 |
Instruction Following Solar Pro4 leads
Mercury 2: 70.2 (#165), Solar Pro4: 72.7 (#132)
| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1329 | 1377 |
Long Context Solar Pro4 leads
Mercury 2: 40.5 (#154), Solar Pro4: 42.1 (#130)
| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1330 | 1381 |
Writing & Preference Solar Pro4 leads
Mercury 2: 53.8 (#155), Solar Pro4: 56.5 (#138)
| Benchmark | Mercury 2 | Solar Pro4 |
|---|---|---|
| LMArena Text | 1355 | 1386 |
| LMArena Creative Writing | 1289 | 1316 |
| LMArena Multi-Turn | 1358 | 1385 |
Frequently asked questions
Is Mercury 2 better than Solar Pro4?
Solar Pro4 is the stronger model overall, scoring 42.1 to 39.1 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: 40.1 versus 33.5 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.