# Claude 3 Sonnet vs GPT-5.5 Pro

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 29.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-sonnet-vs-gpt-5-5-pro
- Last updated: 2026-10-12
- Shared benchmarks: 4

## Summary

- They share 4 benchmarks with published results for both. Claude 3 Sonnet scores higher in 0 categories and GPT-5.5 Pro in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 Pro leads 84.0 to 10.7.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 2.5% for Claude 3 Sonnet and 100% for GPT-5.5 Pro.

## Snapshot

| | Claude 3 Sonnet | GPT-5.5 Pro |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 29.0 | 64.3 |
| Rank | 319 | 8 |
| Context | — | 1.05M |
| Input $/M | — | $30 |
| Output $/M | — | $180 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 3 Sonnet: 29.6 (#302)
- GPT-5.5 Pro: —

| Benchmark | Claude 3 Sonnet | GPT-5.5 Pro |
|---|---|---|
| WeirdML | 10.2% | — |
| BigCodeBench Instruct | 42.7% | — |
| LMArena Coding | 1223 | — |
| BigCodeBench Complete | 53.8% | — |
| HumanEval+ | 64% | — |
| MBPP+ | 69.3% | — |

## Reasoning

- Claude 3 Sonnet: 20.5 (#237)
- GPT-5.5 Pro: 73.3 (#10)

| Benchmark | Claude 3 Sonnet | GPT-5.5 Pro |
|---|---|---|
| DTBench | 53.6% | 96% |
| Epoch Capabilities Index | 120.7 | 162.07 |
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| ARC-AGI-1 | — | 96.5% |
| CritPt | — | 30.6% |
| Chess Puzzles | — | 64% |
| LMArena Hard Prompts | 1197 | — |
| LMCA | — | 53.9% |
| WinoGrande | 75.1% | — |

## Math

- Claude 3 Sonnet: 10.7 (#310)
- GPT-5.5 Pro: 84.0 (#10)

| Benchmark | Claude 3 Sonnet | GPT-5.5 Pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | 100% |
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| LMArena Math | 1213 | — |
| MATH Level 5 | 18.2% | — |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |

## Knowledge

- Claude 3 Sonnet: 21.1 (#276)
- GPT-5.5 Pro: 64.1 (#19)

| Benchmark | Claude 3 Sonnet | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | 40.6% | 93.9% |
| LMArena Expert | 1173 | — |
| MMLU | 75.9% | — |

## Multimodal

- Claude 3 Sonnet: 25.2 (#125)
- GPT-5.5 Pro: —

| Benchmark | Claude 3 Sonnet | GPT-5.5 Pro |
|---|---|---|
| LMArena Vision | 984 | — |

## Multilingual

- Claude 3 Sonnet: 37.8 (#234)
- GPT-5.5 Pro: —

| Benchmark | Claude 3 Sonnet | GPT-5.5 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)
- GPT-5.5 Pro: —

| Benchmark | Claude 3 Sonnet | GPT-5.5 Pro |
|---|---|---|
| LMArena Instruction Following | 1199 | — |

## Long Context

- Claude 3 Sonnet: 36.7 (#228)
- GPT-5.5 Pro: —

| Benchmark | Claude 3 Sonnet | GPT-5.5 Pro |
|---|---|---|
| LMArena Longer Query | 1211 | — |

## Writing & Preference

- Claude 3 Sonnet: 42.1 (#238)
- GPT-5.5 Pro: —

| Benchmark | Claude 3 Sonnet | GPT-5.5 Pro |
|---|---|---|
| LMArena Text | 1218 | — |
| LMArena Creative Writing | 1186 | — |
| LMArena Multi-Turn | 1227 | — |

## FAQ

### Is Claude 3 Sonnet better than GPT-5.5 Pro?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 29.0 on the Noometry Index.

### How many benchmarks do Claude 3 Sonnet and GPT-5.5 Pro share?

4 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and GPT-5.5 Pro has 14.