# Claude 3 Sonnet vs Grok 4.3

> Grok 4.3 is the stronger model overall, scoring 43.8 to 29.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-sonnet-vs-grok-4-3
- Last updated: 2026-10-10
- Shared benchmarks: 23

## Summary

- They share 23 benchmarks with published results for both. Claude 3 Sonnet scores higher in 0 categories and Grok 4.3 in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Grok 4.3 leads 46.0 to 10.7.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 2.5% for Claude 3 Sonnet and 93.3% for Grok 4.3.

## Snapshot

| | Claude 3 Sonnet | Grok 4.3 |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 29.0 | 43.8 |
| Rank | 319 | 86 |
| Context | — | 1M |
| Input $/M | — | $1.25 |
| Output $/M | — | $2.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 3 Sonnet: 29.6 (#302)
- Grok 4.3: 41.6 (#121)

| Benchmark | Claude 3 Sonnet | Grok 4.3 |
|---|---|---|
| WeirdML | 10.2% | 49.9% |
| LMArena Coding | 1223 | 1415 |
| LMArena WebDev | — | 1357 |
| SciCode | — | 47.3% |
| BigCodeBench Instruct | 42.7% | — |
| BigCodeBench Complete | 53.8% | — |
| ALE-Bench | — | 944.17 |
| HumanEval+ | 64% | — |
| MBPP+ | 69.3% | — |

## Agentic & Tool Use

- Claude 3 Sonnet: —
- Grok 4.3: 27.7 (#99)

| Benchmark | Claude 3 Sonnet | Grok 4.3 |
|---|---|---|
| GDP.pdf | — | 8% |
| LMArena Search | — | 1165 |
| Vending-Bench 2 | — | 35.26 |

## Reasoning

- Claude 3 Sonnet: 20.5 (#237)
- Grok 4.3: 35.9 (#68)

| Benchmark | Claude 3 Sonnet | Grok 4.3 |
|---|---|---|
| LMArena Hard Prompts | 1197 | 1396 |
| DTBench | 53.6% | 90.7% |
| Epoch Capabilities Index | 120.7 | 149.16 |
| NYT Connections (extended) | — | 55.2% |
| CritPt | — | 8% |
| Chess Puzzles | — | 25% |
| LMCA | — | 38.3% |
| ForecastBench | — | 60.3 |
| WinoGrande | 75.1% | — |

## Math

- Claude 3 Sonnet: 10.7 (#310)
- Grok 4.3: 46.0 (#74)

| Benchmark | Claude 3 Sonnet | Grok 4.3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | 93.3% |
| LMArena Math | 1213 | 1388 |
| FrontierMath (Tiers 1-3) | — | 42.8% |
| FrontierMath Tier 4 | — | 14.6% |
| ProofBench | — | 11% |
| MATH Level 5 | 18.2% | — |

## Knowledge

- Claude 3 Sonnet: 21.1 (#276)
- Grok 4.3: 52.5 (#62)

| Benchmark | Claude 3 Sonnet | Grok 4.3 |
|---|---|---|
| GPQA Diamond | 40.6% | 88.8% |
| LMArena Expert | 1173 | 1385 |
| SimpleQA Verified | — | 33.2% |
| MMLU | 75.9% | — |

## Multimodal

- Claude 3 Sonnet: 25.2 (#125)
- Grok 4.3: 31.6 (#104)

| Benchmark | Claude 3 Sonnet | Grok 4.3 |
|---|---|---|
| LMArena Vision | 984 | 1229 |
| Blueprint-Bench 2 | — | 0% |

## Multilingual

- Claude 3 Sonnet: 37.8 (#234)
- Grok 4.3: 50.5 (#120)

| Benchmark | Claude 3 Sonnet | Grok 4.3 |
|---|---|---|
| LMArena Non-English | 1205 | 1385 |
| LMArena Chinese | 1189 | 1422 |
| LMArena French | 1229 | 1412 |
| LMArena German | 1204 | 1395 |
| LMArena Japanese | 1131 | 1379 |
| LMArena Korean | 1128 | 1356 |
| LMArena Russian | 1227 | 1399 |
| LMArena Spanish | 1204 | 1398 |

## Instruction Following

- Claude 3 Sonnet: 62.8 (#235)
- Grok 4.3: 72.1 (#140)

| Benchmark | Claude 3 Sonnet | Grok 4.3 |
|---|---|---|
| LMArena Instruction Following | 1199 | 1366 |

## Long Context

- Claude 3 Sonnet: 36.7 (#228)
- Grok 4.3: 42.5 (#123)

| Benchmark | Claude 3 Sonnet | Grok 4.3 |
|---|---|---|
| LMArena Longer Query | 1211 | 1393 |

## Writing & Preference

- Claude 3 Sonnet: 42.1 (#238)
- Grok 4.3: 58.5 (#118)

| Benchmark | Claude 3 Sonnet | Grok 4.3 |
|---|---|---|
| LMArena Text | 1218 | 1397 |
| LMArena Creative Writing | 1186 | 1380 |
| LMArena Multi-Turn | 1227 | 1406 |
| EQ-Bench 4 | — | 1075 |

## FAQ

### Is Claude 3 Sonnet better than Grok 4.3?

Grok 4.3 is the stronger model overall, scoring 43.8 to 29.0 on the Noometry Index.

### Is Claude 3 Sonnet or Grok 4.3 better for coding?

Grok 4.3 scores higher on coding benchmarks: 41.6 versus 29.6 in the Noometry coding category.

### How many benchmarks do Claude 3 Sonnet and Grok 4.3 share?

23 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and Grok 4.3 has 40.