Model comparison
GPT-5.5 Pro vs Molmo 2 8b
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 38.7 on the Noometry Index.
Last verified . 0 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.6 to 24.5.
- Molmo 2 8b has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Pro | Molmo 2 8b | |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 64.3 | 38.7 |
| Released | 2026-04-23 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $30 | — |
| Output $ / M tokens | $180 | — |
| Results tracked | 14 | 5 |
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Category by category
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.6 (#7), Molmo 2 8b: 24.5 (#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 | — | 1288 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.45 | — |
Math Not comparable
GPT-5.5 Pro: 83.8 (#8), 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 Not comparable
GPT-5.5 Pro: 64.2 (#17), Molmo 2 8b: —
| Benchmark | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| GPQA Diamond | 93.9% | — |
Multimodal Not comparable
GPT-5.5 Pro: —, Molmo 2 8b: 29.5 (#106)
| Benchmark | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| LMArena Vision | — | 1081 |
Multilingual Not comparable
GPT-5.5 Pro: —, Molmo 2 8b: 42.8 (#186)
| Benchmark | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | — | 1275 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Molmo 2 8b: 67.2 (#196)
| Benchmark | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | — | 1270 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Molmo 2 8b: 49.5 (#187)
| Benchmark | GPT-5.5 Pro | Molmo 2 8b |
|---|---|---|
| LMArena Text | — | 1288 |
Frequently asked questions
Is GPT-5.5 Pro better than Molmo 2 8b?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 38.7 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.