Model comparison
Claude Sonnet 5.5 vs Olmo 2 0325 32b Instruct
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 32.7 on the Noometry Index.
Last verified . 11 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- They share 11 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 8 categories and Olmo 2 0325 32b Instruct in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 26.8.
- Olmo 2 0325 32b Instruct has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 5.5 | Olmo 2 0325 32b Instruct | |
|---|---|---|
| Provider | Anthropic | Allen Institute for AI (Ai2) |
| Noometry Index | 61.9 | 32.7 |
| Released | 2026-09-28 | — |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 32 | 16 |
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Category by category
Coding Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 67.3 (#6), Olmo 2 0325 32b Instruct: 35.2 (#227)
| Benchmark | Claude Sonnet 5.5 | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Coding | 1513 | 1210 |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1774 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| ALE-Bench | 1,819 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 5.5: 45.0 (#16), Olmo 2 0325 32b Instruct: —
| Benchmark | Claude Sonnet 5.5 | Olmo 2 0325 32b Instruct |
|---|---|---|
| APEX-Agents | 75.5% | — |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 54.0 (#28), Olmo 2 0325 32b Instruct: 23.6 (#175)
| Benchmark | Claude Sonnet 5.5 | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Hard Prompts | 1495 | 1208 |
| NYT Connections (extended) | 80.5% | — |
| CritPt | 31.4% | — |
| Mystery Game Puzzles | 65% | — |
| Epoch Capabilities Index | 165.03 | — |
Math Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 87.9 (#6), Olmo 2 0325 32b Instruct: 26.8 (#255)
| Benchmark | Claude Sonnet 5.5 | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Math | 1510 | 1208 |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| Omni-MATH | — | 16.1% |
| FrontierMath Erdős | 2.9% | — |
Knowledge Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#12), Olmo 2 0325 32b Instruct: 19.5 (#279)
| Benchmark | Claude Sonnet 5.5 | Olmo 2 0325 32b Instruct |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
| MMLU-Pro | — | 41.4% |
| GPQA (HELM) | — | 28.7% |
| LMArena Expert | 1540 | — |
Multimodal Not comparable
Claude Sonnet 5.5: 51.5 (#6), Olmo 2 0325 32b Instruct: —
| Benchmark | Claude Sonnet 5.5 | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Vision | 1289 | — |
| Furniture Assembly | 75% | — |
Multilingual Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 55.3 (#30), Olmo 2 0325 32b Instruct: 34.8 (#248)
| Benchmark | Claude Sonnet 5.5 | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Non-English | 1452 | 1160 |
| LMArena Chinese | 1522 | 1192 |
| LMArena Russian | 1451 | 1187 |
Instruction Following Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 78.3 (#11), Olmo 2 0325 32b Instruct: 61.5 (#244)
| Benchmark | Claude Sonnet 5.5 | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Instruction Following | 1495 | 1186 |
| IFEval | — | 78% |
Long Context Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 45.9 (#28), Olmo 2 0325 32b Instruct: 36.2 (#234)
| Benchmark | Claude Sonnet 5.5 | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Longer Query | 1498 | 1194 |
Writing & Preference Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#40), Olmo 2 0325 32b Instruct: 42.1 (#236)
| Benchmark | Claude Sonnet 5.5 | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Text | 1471 | 1218 |
| LMArena Creative Writing | 1465 | 1199 |
| LMArena Multi-Turn | 1474 | 1221 |
| WildBench | — | 73.4% |
Frequently asked questions
Is Claude Sonnet 5.5 better than Olmo 2 0325 32b Instruct?
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 32.7 on the Noometry Index.
Is Claude Sonnet 5.5 or Olmo 2 0325 32b Instruct better for coding?
Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 35.2 in the Noometry coding category.
How many benchmarks do Claude Sonnet 5.5 and Olmo 2 0325 32b Instruct share?
11 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Olmo 2 0325 32b Instruct has 16.