Model comparison
Mercury 2.5 vs Molmo 2 8b
Molmo 2 8b is the stronger model overall, scoring 39.1 to 33.5 on the Noometry Index.
Last verified . 0 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- The widest gap is in reasoning, where Molmo 2 8b leads 25.6 to 22.4.
- Molmo 2 8b has downloadable open weights; the other is API-only.
Side by side
| Mercury 2.5 | Molmo 2 8b | |
|---|---|---|
| Provider | Inception | Allen Institute for AI (Ai2) |
| Noometry Index | 33.5 | 39.1 |
| Released | 2026-09-08 | — |
| Weights | Proprietary | Open |
| Context window | 260K | — |
| Max output | 66K | — |
| Input $ / M tokens | $0.04 | — |
| Output $ / M tokens | $0.15 | — |
| Results tracked | 4 | 5 |
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Category by category
Coding Not comparable
Mercury 2.5: 39.5 (#156), Molmo 2 8b: —
Reasoning Molmo 2 8b leads
Mercury 2.5: 22.4 (#193), Molmo 2 8b: 25.6 (#146)
| Benchmark | Mercury 2.5 | Molmo 2 8b |
|---|---|---|
| CritPt | 0% | — |
| LMArena Hard Prompts | — | 1287 |
Math Not comparable
Mercury 2.5: 23.3 (#272), Molmo 2 8b: —
| Benchmark | Mercury 2.5 | Molmo 2 8b |
|---|---|---|
| ProofBench | 3% | — |
Multimodal Not comparable
Mercury 2.5: —, Molmo 2 8b: 30.2 (#112)
| Benchmark | Mercury 2.5 | Molmo 2 8b |
|---|---|---|
| LMArena Vision | — | 1081 |
Multilingual Not comparable
Mercury 2.5: —, Molmo 2 8b: 42.7 (#190)
| Benchmark | Mercury 2.5 | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | — | 1276 |
Instruction Following Not comparable
Mercury 2.5: —, Molmo 2 8b: 67.0 (#201)
| Benchmark | Mercury 2.5 | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | — | 1270 |
Writing & Preference Not comparable
Mercury 2.5: —, Molmo 2 8b: 49.4 (#191)
| Benchmark | Mercury 2.5 | Molmo 2 8b |
|---|---|---|
| LMArena Text | — | 1288 |
Frequently asked questions
Is Mercury 2.5 better than Molmo 2 8b?
Molmo 2 8b is the stronger model overall, scoring 39.1 to 33.5 on the Noometry Index.
How many benchmarks do Mercury 2.5 and Molmo 2 8b share?
0 benchmarks have published results for both models. Mercury 2.5 has 4 scored results on Noometry and Molmo 2 8b has 5.