# Claude Sonnet 5.5 vs Grok 4

> Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 47.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-grok-4
- 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 6 categories and Grok 4 in 0 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 88.7 to 46.5.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Sonnet 5.5 and 84% for Grok 4.

## Snapshot

| | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 60.5 | 47.8 |
| Rank | 10 | 49 |
| Context | 1M | — |
| Input $/M | $2 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 5.5: 65.5 (#6)
- Grok 4: 49.9 (#44)

| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| FrontierCode | 52.1% | — |
| Aider Polyglot | — | 79.6% |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| WeirdML | — | 45.7% |
| LMArena Coding | — | 1408 |
| ALE-Bench | 1,819 | — |

## Agentic & Tool Use

- Claude Sonnet 5.5: 44.9 (#14)
- Grok 4: 32.1 (#62)

| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| Terminal-Bench | — | 27.2% |
| APEX-Agents | 75.5% | — |
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 21.1% |
| Cybench | — | 43% |
| DeepResearch Bench | — | 47.3% |
| BALROG | — | 43.6% |
| LMArena Search | — | 1142 |
| METR Time Horizons | — | 66.6% |

## Reasoning

- Claude Sonnet 5.5: 52.4 (#29)
- Grok 4: 36.9 (#59)

| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| ARC-AGI-2 | — | 16% |
| SimpleBench | — | 60.5% |
| Kagi LLM Benchmark | — | 73.6% |
| ARC-AGI-1 | — | 66.7% |
| CritPt | 31.4% | — |
| Chess Puzzles | — | 28% |
| LMArena Hard Prompts | — | 1409 |
| Mystery Game Puzzles | 65% | — |
| Epoch Capabilities Index | — | 146.46 |
| ForecastBench | — | 60.9 |

## Math

- Claude Sonnet 5.5: 88.7 (#4)
- Grok 4: 46.5 (#58)

| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 84% |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| ProofBench | 100% | — |
| Omni-MATH | — | 60.3% |
| LMArena Math | — | 1422 |
| FrontierMath (Feb 2025 set) | — | 19.7% |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#11)
- Grok 4: 53.7 (#50)

| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| GPQA Diamond | 95.6% | 87% |
| SimpleQA Verified | 46.5% | — |
| MMLU-Pro | — | 85.1% |
| Confabulations | — | 12.4% |
| GPQA (HELM) | — | 72.7% |
| LMArena Expert | — | 1417 |

## Multimodal

- Claude Sonnet 5.5: 53.2 (#5)
- Grok 4: 33.1 (#89)

| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| LMArena Vision | — | 1211 |
| GeoBench | — | 45% |
| Furniture Assembly | 75% | — |

## Multilingual

- Claude Sonnet 5.5: —
- Grok 4: 52.0 (#98)

| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| LMArena Non-English | — | 1403 |
| LMArena Chinese | — | 1428 |
| LMArena French | — | 1418 |
| LMArena German | — | 1429 |
| LMArena Japanese | — | 1396 |
| LMArena Korean | — | 1376 |
| LMArena Russian | — | 1409 |
| LMArena Spanish | — | 1419 |

## Instruction Following

- Claude Sonnet 5.5: —
- Grok 4: 79.4 (#4)

| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| IFEval | — | 94.9% |
| LMArena Instruction Following | — | 1387 |

## Long Context

- Claude Sonnet 5.5: —
- Grok 4: 63.1 (#4)

| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| Fiction.LiveBench | — | 94.4% |
| LMArena Longer Query | — | 1409 |

## Writing & Preference

- Claude Sonnet 5.5: —
- Grok 4: 58.7 (#111)

| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| LMArena Text | — | 1412 |
| LMArena Creative Writing | — | 1397 |
| Short-Story Creative Writing | — | 76.9% |
| WildBench | — | 79.7% |
| LMArena Multi-Turn | — | 1416 |

## FAQ

### Is Claude Sonnet 5.5 better than Grok 4?

Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 47.8 on the Noometry Index.

### Is Claude Sonnet 5.5 or Grok 4 better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 65.5 versus 49.9 in the Noometry coding category.

### How many benchmarks do Claude Sonnet 5.5 and Grok 4 share?

2 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and Grok 4 has 48.