# Claude Sonnet 5 vs Grok 3

> Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 39.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-vs-grok-3
- Last updated: 2026-10-10
- Shared benchmarks: 23

## Summary

- They share 23 benchmarks with published results for both. Claude Sonnet 5 scores higher in 9 categories and Grok 3 in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Sonnet 5 leads 49.1 to 13.7.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 94.7% for Claude Sonnet 5 and 55.6% for Grok 3.

## Snapshot

| | Claude Sonnet 5 | Grok 3 |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 54.6 | 39.9 |
| Rank | 29 | 157 |
| Context | 1M | — |
| Input $/M | $2 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 5: 55.5 (#26)
- Grok 3: 41.9 (#115)

| Benchmark | Claude Sonnet 5 | Grok 3 |
|---|---|---|
| WeirdML | 68.8% | 37.2% |
| LMArena Coding | 1483 | 1432 |
| DeepSWE | 53.8% | — |
| FrontierCode | 42.7% | — |
| Aider Polyglot | — | 53.3% |
| CursorBench | 34.1% | — |
| LMArena WebDev | 1541 | — |
| SciCode | 54.3% | — |
| GSO | 37.3% | — |
| ALE-Bench | 1,463 | — |

## Agentic & Tool Use

- Claude Sonnet 5: 42.8 (#18)
- Grok 3: 30.5 (#76)

| Benchmark | Claude Sonnet 5 | Grok 3 |
|---|---|---|
| APEX-Agents | 54.5% | — |
| BALROG | — | 29.5% |
| GBAEval | 65.3% | — |
| LMArena Search | 1194 | — |
| Vending-Bench 2 | 6,378 | — |

## Reasoning

- Claude Sonnet 5: 49.1 (#39)
- Grok 3: 13.7 (#333)

| Benchmark | Claude Sonnet 5 | Grok 3 |
|---|---|---|
| SimpleBench | 60.6% | 36.1% |
| LMArena Hard Prompts | 1461 | 1434 |
| Epoch Capabilities Index | 156.21 | 138.33 |
| ARC-AGI-2 | — | 0% |
| Kagi LLM Benchmark | — | 61.3% |
| NYT Connections (extended) | 75.1% | — |
| ARC-AGI-1 | — | 5.5% |
| CritPt | 16.9% | — |
| Chess Puzzles | 35% | — |
| Mystery Game Puzzles | 35% | — |
| DTBench | 92.5% | — |
| LMCA | 50% | — |
| Surface Evolver Bench | 60% | — |
| Bench to the Future 3 | 0.14 | — |
| ForecastBench | 61.1 | — |

## Math

- Claude Sonnet 5: 66.2 (#27)
- Grok 3: 38.0 (#145)

| Benchmark | Claude Sonnet 5 | Grok 3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 94.7% | 55.6% |
| LMArena Math | 1467 | 1391 |
| FrontierMath (Tiers 1-3) | 65.6% | — |
| FrontierMath Tier 4 | 29.3% | — |
| ProofBench | 77% | — |
| Omni-MATH | — | 46.4% |
| MATH Level 5 | — | 88.7% |
| FrontierMath (Feb 2025 set) | — | 3.8% |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- Claude Sonnet 5: 55.6 (#47)
- Grok 3: 46.2 (#82)

| Benchmark | Claude Sonnet 5 | Grok 3 |
|---|---|---|
| GPQA Diamond | 90.5% | 75.8% |
| LMArena Expert | 1490 | 1421 |
| SimpleQA Verified | 33.7% | — |
| MMLU-Pro | — | 78.8% |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 5.8% |
| GPQA (HELM) | — | 65% |

## Multimodal

- Claude Sonnet 5: 42.4 (#31)
- Grok 3: —

| Benchmark | Claude Sonnet 5 | Grok 3 |
|---|---|---|
| LMArena Vision | 1274 | — |
| Blueprint-Bench 2 | 24.9% | — |
| LMArena Document | 1466 | — |

## Multilingual

- Claude Sonnet 5: 53.8 (#55)
- Grok 3: 52.3 (#87)

| Benchmark | Claude Sonnet 5 | Grok 3 |
|---|---|---|
| LMArena Non-English | 1431 | 1410 |
| LMArena Chinese | 1477 | 1448 |
| LMArena French | 1460 | 1460 |
| LMArena German | 1440 | 1431 |
| LMArena Japanese | 1422 | 1387 |
| LMArena Korean | 1411 | 1373 |
| LMArena Russian | 1451 | 1416 |
| LMArena Spanish | 1437 | 1417 |

## Instruction Following

- Claude Sonnet 5: 76.3 (#41)
- Grok 3: 75.0 (#73)

| Benchmark | Claude Sonnet 5 | Grok 3 |
|---|---|---|
| LMArena Instruction Following | 1452 | 1409 |
| IFEval | — | 88.4% |

## Long Context

- Claude Sonnet 5: 44.8 (#55)
- Grok 3: 38.7 (#192)

| Benchmark | Claude Sonnet 5 | Grok 3 |
|---|---|---|
| LMArena Longer Query | 1463 | 1439 |
| Fiction.LiveBench | — | 58.3% |

## Writing & Preference

- Claude Sonnet 5: 69.2 (#25)
- Grok 3: 55.8 (#141)

| Benchmark | Claude Sonnet 5 | Grok 3 |
|---|---|---|
| LMArena Text | 1442 | 1426 |
| LMArena Creative Writing | 1416 | 1414 |
| EQ-Bench Creative Writing | 1794 | 1186 |
| LMArena Multi-Turn | 1454 | 1425 |
| Short-Story Creative Writing | — | 76.4% |
| WildBench | — | 84.9% |
| EQ-Bench 4 | 1236 | — |

## FAQ

### Is Claude Sonnet 5 better than Grok 3?

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 39.9 on the Noometry Index.

### Is Claude Sonnet 5 or Grok 3 better for coding?

Claude Sonnet 5 scores higher on coding benchmarks: 55.5 versus 41.9 in the Noometry coding category.

### How many benchmarks do Claude Sonnet 5 and Grok 3 share?

23 benchmarks have published results for both models. Claude Sonnet 5 has 51 scored results on Noometry and Grok 3 has 40.