# Claude 3 Sonnet vs o3-pro

> o3-pro is the stronger model overall, scoring 42.9 to 29.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-sonnet-vs-o3-pro
- Last updated: 2026-10-10
- Shared benchmarks: 3

## Summary

- They share 3 benchmarks with published results for both. Claude 3 Sonnet scores higher in 0 categories and o3-pro in 5 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in long context, where o3-pro leads 72.2 to 36.7.
- The biggest single-benchmark swing is WeirdML: 10.2% for Claude 3 Sonnet and 58.2% for o3-pro.

## Snapshot

| | Claude 3 Sonnet | o3-pro |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 29.0 | 42.9 |
| Rank | 319 | 105 |
| Context | — | 200K |
| Input $/M | — | $20 |
| Output $/M | — | $80 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 3 Sonnet: 29.6 (#302)
- o3-pro: 55.5 (#24)

| Benchmark | Claude 3 Sonnet | o3-pro |
|---|---|---|
| WeirdML | 10.2% | 58.2% |
| Aider Polyglot | — | 84.9% |
| BigCodeBench Instruct | 42.7% | — |
| LMArena Coding | 1223 | — |
| BigCodeBench Complete | 53.8% | — |
| HumanEval+ | 64% | — |
| MBPP+ | 69.3% | — |

## Reasoning

- Claude 3 Sonnet: 20.5 (#237)
- o3-pro: 23.8 (#171)

| Benchmark | Claude 3 Sonnet | o3-pro |
|---|---|---|
| DTBench | 53.6% | 86.9% |
| Epoch Capabilities Index | 120.7 | 147.42 |
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 72.1% |
| ARC-AGI-1 | — | 59.3% |
| LMArena Hard Prompts | 1197 | — |
| LMCA | — | 38.5% |
| WinoGrande | 75.1% | — |

## Math

- Claude 3 Sonnet: 10.7 (#310)
- o3-pro: —

| Benchmark | Claude 3 Sonnet | o3-pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | — |
| LMArena Math | 1213 | — |
| MATH Level 5 | 18.2% | — |

## Knowledge

- Claude 3 Sonnet: 21.1 (#276)
- o3-pro: 29.5 (#238)

| Benchmark | Claude 3 Sonnet | o3-pro |
|---|---|---|
| GPQA Diamond | 40.6% | — |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
| LMArena Expert | 1173 | — |
| MMLU | 75.9% | — |

## Multimodal

- Claude 3 Sonnet: 25.2 (#125)
- o3-pro: —

| Benchmark | Claude 3 Sonnet | o3-pro |
|---|---|---|
| LMArena Vision | 984 | — |

## Multilingual

- Claude 3 Sonnet: 37.8 (#234)
- o3-pro: —

| Benchmark | Claude 3 Sonnet | o3-pro |
|---|---|---|
| LMArena Non-English | 1205 | — |
| LMArena Chinese | 1189 | — |
| LMArena French | 1229 | — |
| LMArena German | 1204 | — |
| LMArena Japanese | 1131 | — |
| LMArena Korean | 1128 | — |
| LMArena Russian | 1227 | — |
| LMArena Spanish | 1204 | — |

## Instruction Following

- Claude 3 Sonnet: 62.8 (#235)
- o3-pro: —

| Benchmark | Claude 3 Sonnet | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1199 | — |

## Long Context

- Claude 3 Sonnet: 36.7 (#228)
- o3-pro: 72.2 (#1)

| Benchmark | Claude 3 Sonnet | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1211 | — |

## Writing & Preference

- Claude 3 Sonnet: 42.1 (#238)
- o3-pro: 57.1 (#133)

| Benchmark | Claude 3 Sonnet | o3-pro |
|---|---|---|
| LMArena Text | 1218 | — |
| LMArena Creative Writing | 1186 | — |
| Short-Story Creative Writing | — | 84.4% |
| LMArena Multi-Turn | 1227 | — |

## FAQ

### Is Claude 3 Sonnet better than o3-pro?

o3-pro is the stronger model overall, scoring 42.9 to 29.0 on the Noometry Index.

### Is Claude 3 Sonnet or o3-pro better for coding?

o3-pro scores higher on coding benchmarks: 55.5 versus 29.6 in the Noometry coding category.

### How many benchmarks do Claude 3 Sonnet and o3-pro share?

3 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and o3-pro has 12.