Model comparison
Molmo 2 8b vs Solar Pro4
Solar Pro4 is the stronger model overall, scoring 41.5 to 38.7 on the Noometry Index.
Last verified . 4 shared benchmarks.
Allen Institute for AI (Ai2)
UpstageSummary
- They share 4 benchmarks with published results for both. Molmo 2 8b scores higher in 0 categories and Solar Pro4 in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Solar Pro4 leads 56.7 to 49.5.
- Molmo 2 8b has downloadable open weights; the other is API-only.
Side by side
| Molmo 2 8b | Solar Pro4 | |
|---|---|---|
| Provider | Allen Institute for AI (Ai2) | Upstage |
| Noometry Index | 38.7 | 41.5 |
| Released | — | 2026-08-06 |
| Weights | Open | Proprietary |
| Context window | — | 524K |
| Max output | — | 131K |
| Input $ / M tokens | — | $0.30 |
| Output $ / M tokens | — | $1.20 |
| Results tracked | 5 | 18 |
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Category by category
Coding Not comparable
Molmo 2 8b: —, Solar Pro4: 39.9 (#135)
| Benchmark | Molmo 2 8b | Solar Pro4 |
|---|---|---|
| LMArena WebDev | — | 1371 |
| LMArena Coding | — | 1439 |
Reasoning Solar Pro4 leads
Molmo 2 8b: 24.5 (#146), Solar Pro4: 27.3 (#107)
| Benchmark | Molmo 2 8b | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1288 | 1398 |
Math Not comparable
Molmo 2 8b: —, Solar Pro4: 36.1 (#129)
| Benchmark | Molmo 2 8b | Solar Pro4 |
|---|---|---|
| LMArena Math | — | 1418 |
Knowledge Not comparable
Molmo 2 8b: —, Solar Pro4: 39.0 (#128)
| Benchmark | Molmo 2 8b | Solar Pro4 |
|---|---|---|
| LMArena Expert | — | 1421 |
Multimodal Not comparable
Molmo 2 8b: 29.5 (#106), Solar Pro4: —
| Benchmark | Molmo 2 8b | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1081 | — |
Multilingual Solar Pro4 leads
Molmo 2 8b: 42.8 (#186), Solar Pro4: 49.0 (#134)
| Benchmark | Molmo 2 8b | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1275 | 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 leads
Molmo 2 8b: 67.2 (#196), Solar Pro4: 72.8 (#128)
| Benchmark | Molmo 2 8b | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1270 | 1376 |
Long Context Not comparable
Molmo 2 8b: —, Solar Pro4: 42.0 (#125)
| Benchmark | Molmo 2 8b | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | — | 1379 |
Writing & Preference Solar Pro4 leads
Molmo 2 8b: 49.5 (#187), Solar Pro4: 56.7 (#133)
| Benchmark | Molmo 2 8b | Solar Pro4 |
|---|---|---|
| LMArena Text | 1288 | 1386 |
| LMArena Creative Writing | — | 1313 |
| LMArena Multi-Turn | — | 1391 |
Frequently asked questions
Is Molmo 2 8b better than Solar Pro4?
Solar Pro4 is the stronger model overall, scoring 41.5 to 38.7 on the Noometry Index.
How many benchmarks do Molmo 2 8b and Solar Pro4 share?
4 benchmarks have published results for both models. Molmo 2 8b has 5 scored results on Noometry and Solar Pro4 has 18.