# Molmo 2 8b vs o3-pro

> o3-pro is the stronger model overall, scoring 42.9 to 39.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/molmo-2-8b-vs-o3-pro
- Last updated: 2026-10-10
- Shared benchmarks: 0

## 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.

## Snapshot

| | Molmo 2 8b | o3-pro |
|---|---|---|
| Provider | Allen Institute for AI (Ai2) | OpenAI |
| Noometry Index | 39.1 | 42.9 |
| Rank | 174 | 105 |
| Context | — | 200K |
| Input $/M | — | $20 |
| Output $/M | — | $80 |
| Weights | Open | Proprietary |

## Coding

- 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: 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

- Molmo 2 8b: —
- o3-pro: 29.5 (#238)

| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |

## Multimodal

- Molmo 2 8b: 30.2 (#112)
- o3-pro: —

| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| LMArena Vision | 1081 | — |

## Multilingual

- Molmo 2 8b: 42.7 (#190)
- o3-pro: —

| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| LMArena Non-English | 1276 | — |

## Instruction Following

- Molmo 2 8b: 67.0 (#201)
- o3-pro: —

| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1270 | — |

## Long Context

- Molmo 2 8b: —
- o3-pro: 72.2 (#1)

| Benchmark | Molmo 2 8b | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |

## Writing & Preference

- 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% |

## FAQ

### 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.