Model comparison
Claude Sonnet 5.5 vs Molmo 2 8b
Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 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 Claude Sonnet 5.5 leads 52.4 to 24.5.
- Molmo 2 8b has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 5.5 | Molmo 2 8b | |
|---|---|---|
| Provider | Anthropic | Allen Institute for AI (Ai2) |
| Noometry Index | 60.5 | 38.7 |
| Released | 2026-09-28 | — |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 16 | 5 |
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Category by category
Coding Not comparable
Claude Sonnet 5.5: 65.5 (#6), Molmo 2 8b: —
| Benchmark | Claude Sonnet 5.5 | Molmo 2 8b |
|---|---|---|
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| ALE-Bench | 1,819 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 5.5: 44.9 (#14), Molmo 2 8b: —
| Benchmark | Claude Sonnet 5.5 | Molmo 2 8b |
|---|---|---|
| APEX-Agents | 75.5% | — |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 52.4 (#29), Molmo 2 8b: 24.5 (#146)
| Benchmark | Claude Sonnet 5.5 | Molmo 2 8b |
|---|---|---|
| CritPt | 31.4% | — |
| LMArena Hard Prompts | — | 1288 |
| Mystery Game Puzzles | 65% | — |
Math Not comparable
Claude Sonnet 5.5: 88.7 (#4), Molmo 2 8b: —
| Benchmark | Claude Sonnet 5.5 | Molmo 2 8b |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
Knowledge Not comparable
Claude Sonnet 5.5: 66.0 (#11), Molmo 2 8b: —
| Benchmark | Claude Sonnet 5.5 | Molmo 2 8b |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
Multimodal Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 53.2 (#5), Molmo 2 8b: 29.5 (#106)
| Benchmark | Claude Sonnet 5.5 | Molmo 2 8b |
|---|---|---|
| LMArena Vision | — | 1081 |
| Furniture Assembly | 75% | — |
Multilingual Not comparable
Claude Sonnet 5.5: —, Molmo 2 8b: 42.8 (#186)
| Benchmark | Claude Sonnet 5.5 | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | — | 1275 |
Instruction Following Not comparable
Claude Sonnet 5.5: —, Molmo 2 8b: 67.2 (#196)
| Benchmark | Claude Sonnet 5.5 | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | — | 1270 |
Writing & Preference Not comparable
Claude Sonnet 5.5: —, Molmo 2 8b: 49.5 (#187)
| Benchmark | Claude Sonnet 5.5 | Molmo 2 8b |
|---|---|---|
| LMArena Text | — | 1288 |
Frequently asked questions
Is Claude Sonnet 5.5 better than Molmo 2 8b?
Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 38.7 on the Noometry Index.
How many benchmarks do Claude Sonnet 5.5 and Molmo 2 8b share?
0 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and Molmo 2 8b has 5.