# Claude Sonnet 5.5 vs Grok 3

> Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 39.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-grok-3
- Last updated: 2026-10-10
- Shared benchmarks: 2

## Summary

- They share 2 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 5 categories and Grok 3 in 0 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 88.7 to 36.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Sonnet 5.5 and 55.6% for Grok 3.

## Snapshot

| | Claude Sonnet 5.5 | Grok 3 |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 60.5 | 39.6 |
| Rank | 10 | 150 |
| Context | 1M | — |
| Input $/M | $2 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 5.5: 65.5 (#6)
- Grok 3: 41.5 (#113)

| Benchmark | Claude Sonnet 5.5 | Grok 3 |
|---|---|---|
| FrontierCode | 52.1% | — |
| Aider Polyglot | — | 53.3% |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| WeirdML | — | 37.2% |
| LMArena Coding | — | 1432 |
| ALE-Bench | 1,819 | — |

## Agentic & Tool Use

- Claude Sonnet 5.5: 44.9 (#14)
- Grok 3: 30.2 (#69)

| Benchmark | Claude Sonnet 5.5 | Grok 3 |
|---|---|---|
| APEX-Agents | 75.5% | — |
| BALROG | — | 29.5% |

## Reasoning

- Claude Sonnet 5.5: 52.4 (#29)
- Grok 3: 13.8 (#322)

| Benchmark | Claude Sonnet 5.5 | Grok 3 |
|---|---|---|
| ARC-AGI-2 | — | 0% |
| SimpleBench | — | 36.1% |
| Kagi LLM Benchmark | — | 61.3% |
| ARC-AGI-1 | — | 5.5% |
| CritPt | 31.4% | — |
| LMArena Hard Prompts | — | 1433 |
| Mystery Game Puzzles | 65% | — |
| Epoch Capabilities Index | — | 138.34 |

## Math

- Claude Sonnet 5.5: 88.7 (#4)
- Grok 3: 36.2 (#122)

| Benchmark | Claude Sonnet 5.5 | Grok 3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 55.6% |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| ProofBench | 100% | — |
| Omni-MATH | — | 46.4% |
| LMArena Math | — | 1390 |
| MATH Level 5 | — | 88.7% |
| FrontierMath (Feb 2025 set) | — | 3.8% |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#11)
- Grok 3: 46.0 (#76)

| Benchmark | Claude Sonnet 5.5 | Grok 3 |
|---|---|---|
| GPQA Diamond | 95.6% | 75.8% |
| SimpleQA Verified | 46.5% | — |
| MMLU-Pro | — | 78.8% |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 5.8% |
| GPQA (HELM) | — | 65% |
| LMArena Expert | — | 1420 |

## Multimodal

- Claude Sonnet 5.5: 53.2 (#5)
- Grok 3: —

| Benchmark | Claude Sonnet 5.5 | Grok 3 |
|---|---|---|
| Furniture Assembly | 75% | — |

## Multilingual

- Claude Sonnet 5.5: —
- Grok 3: 52.5 (#81)

| Benchmark | Claude Sonnet 5.5 | Grok 3 |
|---|---|---|
| LMArena Non-English | — | 1411 |
| LMArena Chinese | — | 1448 |
| LMArena French | — | 1460 |
| LMArena German | — | 1431 |
| LMArena Japanese | — | 1389 |
| LMArena Korean | — | 1374 |
| LMArena Russian | — | 1416 |
| LMArena Spanish | — | 1417 |

## Instruction Following

- Claude Sonnet 5.5: —
- Grok 3: 75.2 (#69)

| Benchmark | Claude Sonnet 5.5 | Grok 3 |
|---|---|---|
| IFEval | — | 88.4% |
| LMArena Instruction Following | — | 1409 |

## Long Context

- Claude Sonnet 5.5: —
- Grok 3: 38.7 (#187)

| Benchmark | Claude Sonnet 5.5 | Grok 3 |
|---|---|---|
| Fiction.LiveBench | — | 58.3% |
| LMArena Longer Query | — | 1439 |

## Writing & Preference

- Claude Sonnet 5.5: —
- Grok 3: 56.0 (#136)

| Benchmark | Claude Sonnet 5.5 | Grok 3 |
|---|---|---|
| LMArena Text | — | 1426 |
| LMArena Creative Writing | — | 1414 |
| Short-Story Creative Writing | — | 76.4% |
| EQ-Bench Creative Writing | — | 1186 |
| WildBench | — | 84.9% |
| LMArena Multi-Turn | — | 1424 |

## FAQ

### Is Claude Sonnet 5.5 better than Grok 3?

Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 39.6 on the Noometry Index.

### Is Claude Sonnet 5.5 or Grok 3 better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 65.5 versus 41.5 in the Noometry coding category.

### How many benchmarks do Claude Sonnet 5.5 and Grok 3 share?

2 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and Grok 3 has 40.