Model comparison
Molmo 2 8b vs o3-pro
o3-pro is the stronger model overall, scoring 42.9 to 39.1 on the Noometry Index.
Last verified . 0 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- The widest gap is in writing & preference, where o3-pro leads 57.1 to 49.4.
- Molmo 2 8b has downloadable open weights; the other is API-only.
Side by side
| Molmo 2 8b | o3-pro | |
|---|---|---|
| Provider | Allen Institute for AI (Ai2) | OpenAI |
| Noometry Index | 39.1 | 42.9 |
| Released | — | 2025-06-10 |
| Weights | Open | Proprietary |
| Context window | — | 200K |
| Max output | — | 100K |
| Input $ / M tokens | — | $20 |
| Output $ / M tokens | — | $80 |
| Results tracked | 5 | 12 |
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Category by category
Coding Not comparable
Molmo 2 8b: —, o3-pro: 55.5 (#24)
| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| Aider Polyglot | — | 84.9% |
| WeirdML | — | 58.2% |
Reasoning Molmo 2 8b leads
Molmo 2 8b: 25.6 (#146), o3-pro: 23.8 (#171)
| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 72.1% |
| ARC-AGI-1 | — | 59.3% |
| LMArena Hard Prompts | 1287 | — |
| DTBench | — | 86.9% |
| LMCA | — | 38.5% |
| Epoch Capabilities Index | — | 147.42 |
Knowledge Not comparable
Molmo 2 8b: —, o3-pro: 29.5 (#238)
| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
Multimodal Not comparable
Molmo 2 8b: 30.2 (#112), o3-pro: —
| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| LMArena Vision | 1081 | — |
Multilingual Not comparable
Molmo 2 8b: 42.7 (#190), o3-pro: —
| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| LMArena Non-English | 1276 | — |
Instruction Following Not comparable
Molmo 2 8b: 67.0 (#201), o3-pro: —
| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1270 | — |
Long Context Not comparable
Molmo 2 8b: —, o3-pro: 72.2 (#1)
| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
Writing & Preference o3-pro leads
Molmo 2 8b: 49.4 (#191), o3-pro: 57.1 (#133)
| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| LMArena Text | 1288 | — |
| Short-Story Creative Writing | — | 84.4% |
Frequently asked questions
Is Molmo 2 8b better than o3-pro?
o3-pro is the stronger model overall, scoring 42.9 to 39.1 on the Noometry Index.
How many benchmarks do Molmo 2 8b and o3-pro share?
0 benchmarks have published results for both models. Molmo 2 8b has 5 scored results on Noometry and o3-pro has 12.