# GPT-5.5 Pro vs Molmo 2 8b

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 39.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-pro-vs-molmo-2-8b
- Last updated: 2026-10-12
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 25.6.
- Molmo 2 8b has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 64.3 | 39.1 |
| Rank | 8 | 174 |
| Context | 1.05M | — |
| Input $/M | $30 | — |
| Output $/M | $180 | — |
| Weights | Proprietary | Open |

## Reasoning

- GPT-5.5 Pro: 73.3 (#10)
- Molmo 2 8b: 25.6 (#146)

| Benchmark | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1287 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |

## Math

- GPT-5.5 Pro: 84.0 (#10)
- Molmo 2 8b: —

| Benchmark | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |

## Knowledge

- GPT-5.5 Pro: 64.1 (#19)
- Molmo 2 8b: —

| Benchmark | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| GPQA Diamond | 93.9% | — |

## Multimodal

- GPT-5.5 Pro: —
- Molmo 2 8b: 30.2 (#112)

| Benchmark | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| LMArena Vision | — | 1081 |

## Multilingual

- GPT-5.5 Pro: —
- Molmo 2 8b: 42.7 (#190)

| Benchmark | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | — | 1276 |

## Instruction Following

- GPT-5.5 Pro: —
- Molmo 2 8b: 67.0 (#201)

| Benchmark | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | — | 1270 |

## Writing & Preference

- GPT-5.5 Pro: —
- Molmo 2 8b: 49.4 (#191)

| Benchmark | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| LMArena Text | — | 1288 |

## FAQ

### Is GPT-5.5 Pro better than Molmo 2 8b?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 39.1 on the Noometry Index.

### How many benchmarks do GPT-5.5 Pro and Molmo 2 8b share?

0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Molmo 2 8b has 5.