# Claude Opus 4.5 vs Grok-3 mini

> Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 41.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-4-5-vs-grok-3-mini
- Last updated: 2026-10-10
- Shared benchmarks: 25

## Summary

- They share 25 benchmarks with published results for both. Claude Opus 4.5 scores higher in 6 categories and Grok-3 mini in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Opus 4.5 leads 42.6 to 13.6.
- The biggest single-benchmark swing is ARC-AGI-1: 80% for Claude Opus 4.5 and 16.5% for Grok-3 mini.

## Snapshot

| | Claude Opus 4.5 | Grok-3 mini |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 50.5 | 41.2 |
| Rank | 47 | 141 |
| Context | 200K | — |
| Input $/M | $5 | — |
| Output $/M | $25 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Opus 4.5: 54.8 (#27)
- Grok-3 mini: 40.8 (#131)

| Benchmark | Claude Opus 4.5 | Grok-3 mini |
|---|---|---|
| WeirdML | 63.7% | 42.6% |
| LMArena Coding | 1504 | 1379 |
| SWE-bench Verified | 76.7% | — |
| SWE-bench Verified (bash only) | 76.8% | — |
| Aider Polyglot | — | 49.3% |
| LMArena WebDev | 1494 | — |
| SWE-bench Multilingual | 70.7% | — |
| GSO | 26.5% | — |
| ALE-Bench | 1,025 | — |
| AlgoTune | 1.77 | — |

## Agentic & Tool Use

- Claude Opus 4.5: 47.3 (#12)
- Grok-3 mini: —

| Benchmark | Claude Opus 4.5 | Grok-3 mini |
|---|---|---|
| Terminal-Bench | 63.1% | — |
| Berkeley Function Calling Leaderboard | 77.5% | — |
| GDPval | 45.5% | — |
| Remote Labor Index | 3.8% | — |
| τ²-bench Airline | 84% | — |
| τ²-bench Banking | 24.7% | — |
| τ²-bench Retail | 79.6% | — |
| τ²-bench Telecom | 92.3% | — |
| Cybench | 82% | — |
| DeepResearch Bench | 54.8% | — |
| OSWorld | 66.3% | — |
| BALROG | 43.5% | — |
| LMArena Search | 1180 | — |
| METR Time Horizons | 75% | — |
| Vending-Bench 2 | 4,967 | — |

## Reasoning

- Claude Opus 4.5: 42.6 (#51)
- Grok-3 mini: 13.6 (#334)

| Benchmark | Claude Opus 4.5 | Grok-3 mini |
|---|---|---|
| ARC-AGI-2 | 37.6% | 0.4% |
| Kagi LLM Benchmark | 80.2% | 61.3% |
| ARC-AGI-1 | 80% | 16.5% |
| LMArena Hard Prompts | 1476 | 1375 |
| Epoch Capabilities Index | 150.09 | 140.35 |
| SimpleBench | 62% | — |
| NYT Connections (extended) | 52.5% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 11.9% | — |
| EBR-Bench | 14.3% | — |
| Mystery Game Puzzles | 22% | — |
| DTBench | 89.9% | — |
| LMCA | 44.5% | — |
| ForecastBench | 60.7 | — |

## Math

- Claude Opus 4.5: 38.6 (#132)
- Grok-3 mini: 42.1 (#85)

| Benchmark | Claude Opus 4.5 | Grok-3 mini |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 86.1% | 77.8% |
| LMArena Math | 1463 | 1386 |
| FrontierMath (Feb 2025 set) | 20.7% | 5.9% |
| FrontierMath (Tiers 1-3) | 34.4% | — |
| FrontierMath Tier 4 | 4.9% | — |
| ProofBench | 36% | — |
| Omni-MATH | — | 31.8% |
| MATH Level 5 | — | 90.9% |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Claude Opus 4.5: 56.5 (#44)
- Grok-3 mini: 46.4 (#81)

| Benchmark | Claude Opus 4.5 | Grok-3 mini |
|---|---|---|
| GPQA Diamond | 86% | 76.3% |
| LMArena Expert | 1487 | 1395 |
| Humanity's Last Exam | 25.2% | — |
| SimpleQA Verified | 45.7% | — |
| MMLU-Pro | — | 79.9% |
| Confabulations | — | 10.8% |
| Vectara Hallucination Rate | 10.9% | — |
| GPQA (HELM) | — | 67.5% |

## Multimodal

- Claude Opus 4.5: 31.4 (#107)
- Grok-3 mini: —

| Benchmark | Claude Opus 4.5 | Grok-3 mini |
|---|---|---|
| GeoBench | 75% | — |
| VPCT | 40% | — |
| Furniture Assembly | 28.3% | — |
| LMArena Document | 1462 | — |

## Multilingual

- Claude Opus 4.5: 54.3 (#47)
- Grok-3 mini: 48.1 (#145)

| Benchmark | Claude Opus 4.5 | Grok-3 mini |
|---|---|---|
| LMArena Non-English | 1438 | 1352 |
| LMArena Chinese | 1470 | 1387 |
| LMArena French | 1471 | 1357 |
| LMArena German | 1449 | 1349 |
| LMArena Japanese | 1416 | 1342 |
| LMArena Korean | 1424 | 1335 |
| LMArena Russian | 1447 | 1353 |
| LMArena Spanish | 1458 | 1381 |

## Instruction Following

- Claude Opus 4.5: 77.5 (#19)
- Grok-3 mini: 78.5 (#9)

| Benchmark | Claude Opus 4.5 | Grok-3 mini |
|---|---|---|
| LMArena Instruction Following | 1478 | 1357 |
| IFEval | — | 95.1% |

## Long Context

- Claude Opus 4.5: 46.5 (#22)
- Grok-3 mini: 41.0 (#147)

| Benchmark | Claude Opus 4.5 | Grok-3 mini |
|---|---|---|
| LMArena Longer Query | 1480 | 1372 |
| Fiction.LiveBench | — | 66.7% |
| CL-bench | 21.1% | — |

## Writing & Preference

- Claude Opus 4.5: 68.1 (#28)
- Grok-3 mini: 52.5 (#169)

| Benchmark | Claude Opus 4.5 | Grok-3 mini |
|---|---|---|
| LMArena Text | 1451 | 1370 |
| LMArena Creative Writing | 1445 | 1342 |
| LMArena Multi-Turn | 1466 | 1355 |
| Short-Story Creative Writing | — | 73.5% |
| EQ-Bench Creative Writing | 1687 | — |
| WildBench | — | 65.1% |

## FAQ

### Is Claude Opus 4.5 better than Grok-3 mini?

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 41.2 on the Noometry Index.

### Is Claude Opus 4.5 or Grok-3 mini better for coding?

Claude Opus 4.5 scores higher on coding benchmarks: 54.8 versus 40.8 in the Noometry coding category.

### How many benchmarks do Claude Opus 4.5 and Grok-3 mini share?

25 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Grok-3 mini has 35.