Model comparison
Claude Sonnet 5 vs Molmo 2 8b
Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 39.1 on the Noometry Index.
Last verified . 5 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- They share 5 benchmarks with published results for both. Claude Sonnet 5 scores higher in 5 categories and Molmo 2 8b in 0 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Sonnet 5 leads 49.1 to 25.6.
- Molmo 2 8b has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 5 | Molmo 2 8b | |
|---|---|---|
| Provider | Anthropic | Allen Institute for AI (Ai2) |
| Noometry Index | 54.6 | 39.1 |
| Released | 2026-06-29 | — |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 51 | 5 |
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Category by category
Coding Not comparable
Claude Sonnet 5: 55.5 (#26), Molmo 2 8b: —
| Benchmark | Claude Sonnet 5 | Molmo 2 8b |
|---|---|---|
| DeepSWE | 53.8% | — |
| FrontierCode | 42.7% | — |
| CursorBench | 34.1% | — |
| LMArena WebDev | 1541 | — |
| SciCode | 54.3% | — |
| GSO | 37.3% | — |
| WeirdML | 68.8% | — |
| LMArena Coding | 1483 | — |
| ALE-Bench | 1,463 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 5: 42.8 (#18), Molmo 2 8b: —
| Benchmark | Claude Sonnet 5 | Molmo 2 8b |
|---|---|---|
| APEX-Agents | 54.5% | — |
| GBAEval | 65.3% | — |
| LMArena Search | 1194 | — |
| Vending-Bench 2 | 6,378 | — |
Reasoning Claude Sonnet 5 leads
Claude Sonnet 5: 49.1 (#39), Molmo 2 8b: 25.6 (#146)
| Benchmark | Claude Sonnet 5 | Molmo 2 8b |
|---|---|---|
| LMArena Hard Prompts | 1461 | 1287 |
| SimpleBench | 60.6% | — |
| NYT Connections (extended) | 75.1% | — |
| CritPt | 16.9% | — |
| Chess Puzzles | 35% | — |
| Mystery Game Puzzles | 35% | — |
| DTBench | 92.5% | — |
| LMCA | 50% | — |
| Surface Evolver Bench | 60% | — |
| Bench to the Future 3 | 0.14 | — |
| Epoch Capabilities Index | 156.21 | — |
| ForecastBench | 61.1 | — |
Math Not comparable
Claude Sonnet 5: 66.2 (#27), Molmo 2 8b: —
| Benchmark | Claude Sonnet 5 | Molmo 2 8b |
|---|---|---|
| FrontierMath (Tiers 1-3) | 65.6% | — |
| FrontierMath Tier 4 | 29.3% | — |
| OTIS Mock AIME 2024-2025 | 94.7% | — |
| ProofBench | 77% | — |
| LMArena Math | 1467 | — |
Knowledge Not comparable
Claude Sonnet 5: 55.6 (#47), Molmo 2 8b: —
| Benchmark | Claude Sonnet 5 | Molmo 2 8b |
|---|---|---|
| GPQA Diamond | 90.5% | — |
| SimpleQA Verified | 33.7% | — |
| LMArena Expert | 1490 | — |
Multimodal Claude Sonnet 5 leads
Claude Sonnet 5: 42.4 (#31), Molmo 2 8b: 30.2 (#112)
| Benchmark | Claude Sonnet 5 | Molmo 2 8b |
|---|---|---|
| LMArena Vision | 1274 | 1081 |
| Blueprint-Bench 2 | 24.9% | — |
| LMArena Document | 1466 | — |
Multilingual Claude Sonnet 5 leads
Claude Sonnet 5: 53.8 (#55), Molmo 2 8b: 42.7 (#190)
| Benchmark | Claude Sonnet 5 | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | 1431 | 1276 |
| LMArena Chinese | 1477 | — |
| LMArena French | 1460 | — |
| LMArena German | 1440 | — |
| LMArena Japanese | 1422 | — |
| LMArena Korean | 1411 | — |
| LMArena Russian | 1451 | — |
| LMArena Spanish | 1437 | — |
Instruction Following Claude Sonnet 5 leads
Claude Sonnet 5: 76.3 (#41), Molmo 2 8b: 67.0 (#201)
| Benchmark | Claude Sonnet 5 | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | 1452 | 1270 |
Long Context Not comparable
Claude Sonnet 5: 44.8 (#55), Molmo 2 8b: —
| Benchmark | Claude Sonnet 5 | Molmo 2 8b |
|---|---|---|
| LMArena Longer Query | 1463 | — |
Writing & Preference Claude Sonnet 5 leads
Claude Sonnet 5: 69.2 (#25), Molmo 2 8b: 49.4 (#191)
| Benchmark | Claude Sonnet 5 | Molmo 2 8b |
|---|---|---|
| LMArena Text | 1442 | 1288 |
| LMArena Creative Writing | 1416 | — |
| EQ-Bench Creative Writing | 1794 | — |
| EQ-Bench 4 | 1236 | — |
| LMArena Multi-Turn | 1454 | — |
Frequently asked questions
Is Claude Sonnet 5 better than Molmo 2 8b?
Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 39.1 on the Noometry Index.
How many benchmarks do Claude Sonnet 5 and Molmo 2 8b share?
5 benchmarks have published results for both models. Claude Sonnet 5 has 51 scored results on Noometry and Molmo 2 8b has 5.