# Claude Sonnet 5.5 vs Grok-3 mini

> Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 41.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-grok-3-mini
- 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 4 categories and Grok-3 mini in 0 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 88.7 to 40.3.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Sonnet 5.5 and 77.8% for Grok-3 mini.

## Snapshot

| | Claude Sonnet 5.5 | Grok-3 mini |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 60.5 | 41.0 |
| Rank | 10 | 130 |
| Context | 1M | — |
| Input $/M | $2 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 5.5: 65.5 (#6)
- Grok-3 mini: 40.4 (#126)

| Benchmark | Claude Sonnet 5.5 | Grok-3 mini |
|---|---|---|
| FrontierCode | 52.1% | — |
| Aider Polyglot | — | 49.3% |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| WeirdML | — | 42.6% |
| LMArena Coding | — | 1380 |
| ALE-Bench | 1,819 | — |

## Agentic & Tool Use

- Claude Sonnet 5.5: 44.9 (#14)
- Grok-3 mini: —

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

## Reasoning

- Claude Sonnet 5.5: 52.4 (#29)
- Grok-3 mini: 13.8 (#323)

| Benchmark | Claude Sonnet 5.5 | Grok-3 mini |
|---|---|---|
| ARC-AGI-2 | — | 0.4% |
| Kagi LLM Benchmark | — | 61.3% |
| ARC-AGI-1 | — | 16.5% |
| CritPt | 31.4% | — |
| LMArena Hard Prompts | — | 1374 |
| Mystery Game Puzzles | 65% | — |
| Epoch Capabilities Index | — | 140.35 |

## Math

- Claude Sonnet 5.5: 88.7 (#4)
- Grok-3 mini: 40.3 (#78)

| Benchmark | Claude Sonnet 5.5 | Grok-3 mini |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 77.8% |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| ProofBench | 100% | — |
| Omni-MATH | — | 31.8% |
| LMArena Math | — | 1386 |
| MATH Level 5 | — | 90.9% |
| FrontierMath (Feb 2025 set) | — | 5.9% |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#11)
- Grok-3 mini: 46.3 (#75)

| Benchmark | Claude Sonnet 5.5 | Grok-3 mini |
|---|---|---|
| GPQA Diamond | 95.6% | 76.3% |
| SimpleQA Verified | 46.5% | — |
| MMLU-Pro | — | 79.9% |
| Confabulations | — | 10.8% |
| GPQA (HELM) | — | 67.5% |
| LMArena Expert | — | 1395 |

## Multimodal

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

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

## Multilingual

- Claude Sonnet 5.5: —
- Grok-3 mini: 48.3 (#141)

| Benchmark | Claude Sonnet 5.5 | Grok-3 mini |
|---|---|---|
| LMArena Non-English | — | 1352 |
| LMArena Chinese | — | 1387 |
| LMArena French | — | 1357 |
| LMArena German | — | 1350 |
| LMArena Japanese | — | 1343 |
| LMArena Korean | — | 1336 |
| LMArena Russian | — | 1352 |
| LMArena Spanish | — | 1379 |

## Instruction Following

- Claude Sonnet 5.5: —
- Grok-3 mini: 78.7 (#8)

| Benchmark | Claude Sonnet 5.5 | Grok-3 mini |
|---|---|---|
| IFEval | — | 95.1% |
| LMArena Instruction Following | — | 1356 |

## Long Context

- Claude Sonnet 5.5: —
- Grok-3 mini: 41.0 (#142)

| Benchmark | Claude Sonnet 5.5 | Grok-3 mini |
|---|---|---|
| Fiction.LiveBench | — | 66.7% |
| LMArena Longer Query | — | 1372 |

## Writing & Preference

- Claude Sonnet 5.5: —
- Grok-3 mini: 52.7 (#163)

| Benchmark | Claude Sonnet 5.5 | Grok-3 mini |
|---|---|---|
| LMArena Text | — | 1370 |
| LMArena Creative Writing | — | 1342 |
| Short-Story Creative Writing | — | 73.5% |
| WildBench | — | 65.1% |
| LMArena Multi-Turn | — | 1355 |

## FAQ

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

Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 41.0 on the Noometry Index.

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

Claude Sonnet 5.5 scores higher on coding benchmarks: 65.5 versus 40.4 in the Noometry coding category.

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

2 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and Grok-3 mini has 35.