# Claude Sonnet 5.5 vs o1-mini

> Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 34.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-o1-mini
- Last updated: 2026-10-10
- Shared benchmarks: 15

## Summary

- They share 15 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 9 categories and o1-mini in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 35.4.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Sonnet 5.5 and 46.9% for o1-mini.

## Snapshot

| | Claude Sonnet 5.5 | o1-mini |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 61.9 | 34.0 |
| Rank | 10 | 235 |
| Context | 1M | — |
| Input $/M | $2 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 5.5: 67.3 (#6)
- o1-mini: 35.5 (#224)

| Benchmark | Claude Sonnet 5.5 | o1-mini |
|---|---|---|
| LMArena Coding | 1513 | 1362 |
| FrontierCode | 52.1% | — |
| Aider Polyglot | — | 32.9% |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1774 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| WeirdML | — | 36.3% |
| LiveBench Coding | — | 48% |
| ALE-Bench | 1,819 | — |
| HumanEval+ | — | 89% |
| MBPP+ | — | 78.8% |

## Agentic & Tool Use

- Claude Sonnet 5.5: 45.0 (#16)
- o1-mini: 24.6 (#118)

| Benchmark | Claude Sonnet 5.5 | o1-mini |
|---|---|---|
| APEX-Agents | 75.5% | — |
| Cybench | — | 10% |

## Reasoning

- Claude Sonnet 5.5: 54.0 (#28)
- o1-mini: 8.8 (#346)

| Benchmark | Claude Sonnet 5.5 | o1-mini |
|---|---|---|
| LMArena Hard Prompts | 1495 | 1333 |
| Epoch Capabilities Index | 165.03 | 135.82 |
| ARC-AGI-2 | — | 0.8% |
| SimpleBench | — | 18.1% |
| NYT Connections (extended) | 80.5% | — |
| ARC-AGI-1 | — | 14% |
| CritPt | 31.4% | — |
| LiveBench Reasoning | — | 72.3% |
| Mystery Game Puzzles | 65% | — |
| LiveBench Data Analysis | — | 57.9% |
| LiveBench | — | 57.8% |

## Math

- Claude Sonnet 5.5: 87.9 (#6)
- o1-mini: 35.4 (#186)

| Benchmark | Claude Sonnet 5.5 | o1-mini |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 46.9% |
| LMArena Math | 1510 | 1358 |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| ProofBench | 100% | — |
| LiveBench Math | — | 62% |
| MATH Level 5 | — | 89.2% |
| FrontierMath (Feb 2025 set) | — | 1.7% |
| FrontierMath Erdős | 2.9% | — |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#12)
- o1-mini: 34.9 (#192)

| Benchmark | Claude Sonnet 5.5 | o1-mini |
|---|---|---|
| GPQA Diamond | 95.6% | 62.4% |
| LMArena Expert | 1540 | 1316 |
| SimpleQA Verified | 46.5% | — |
| Confabulations | — | 18.6% |

## Multimodal

- Claude Sonnet 5.5: 51.5 (#6)
- o1-mini: —

| Benchmark | Claude Sonnet 5.5 | o1-mini |
|---|---|---|
| LMArena Vision | 1289 | — |
| Furniture Assembly | 75% | — |

## Multilingual

- Claude Sonnet 5.5: 55.3 (#30)
- o1-mini: 43.6 (#182)

| Benchmark | Claude Sonnet 5.5 | o1-mini |
|---|---|---|
| LMArena Non-English | 1452 | 1289 |
| LMArena Chinese | 1522 | 1314 |
| LMArena Russian | 1451 | 1283 |
| LMArena French | — | 1293 |
| LMArena German | — | 1278 |
| LMArena Japanese | — | 1245 |
| LMArena Korean | — | 1223 |
| LMArena Spanish | — | 1303 |

## Instruction Following

- Claude Sonnet 5.5: 78.3 (#11)
- o1-mini: 66.7 (#206)

| Benchmark | Claude Sonnet 5.5 | o1-mini |
|---|---|---|
| LMArena Instruction Following | 1495 | 1304 |
| LiveBench Instruction Following | — | 65.4% |

## Long Context

- Claude Sonnet 5.5: 45.9 (#28)
- o1-mini: 40.1 (#161)

| Benchmark | Claude Sonnet 5.5 | o1-mini |
|---|---|---|
| LMArena Longer Query | 1498 | 1320 |

## Writing & Preference

- Claude Sonnet 5.5: 66.0 (#40)
- o1-mini: 48.4 (#202)

| Benchmark | Claude Sonnet 5.5 | o1-mini |
|---|---|---|
| LMArena Text | 1471 | 1317 |
| LMArena Creative Writing | 1465 | 1244 |
| LMArena Multi-Turn | 1474 | 1314 |
| Short-Story Creative Writing | — | 64.9% |
| LiveBench Language | — | 40.9% |

## FAQ

### Is Claude Sonnet 5.5 better than o1-mini?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 34.0 on the Noometry Index.

### Is Claude Sonnet 5.5 or o1-mini better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 35.5 in the Noometry coding category.

### How many benchmarks do Claude Sonnet 5.5 and o1-mini share?

15 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and o1-mini has 39.