# Claude Opus 5 vs Grok 3

> Claude Opus 5 is the stronger model overall, scoring 67.8 to 39.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-5-vs-grok-3
- Last updated: 2026-10-11
- Shared benchmarks: 26

## Summary

- They share 26 benchmarks with published results for both. Claude Opus 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 Opus 5 leads 77.2 to 13.7.
- The biggest single-benchmark swing is ARC-AGI-1: 97.5% for Claude Opus 5 and 5.5% for Grok 3.

## Snapshot

| | Claude Opus 5 | Grok 3 |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 67.8 | 39.9 |
| Rank | 4 | 157 |
| Context | 1M | — |
| Input $/M | $5 | — |
| Output $/M | $25 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Opus 5: 67.5 (#5)
- Grok 3: 41.9 (#115)

| Benchmark | Claude Opus 5 | Grok 3 |
|---|---|---|
| WeirdML | 91.8% | 37.2% |
| LMArena Coding | 1534 | 1432 |
| DeepSWE | 73.6% | — |
| FrontierCode | 53.4% | — |
| Aider Polyglot | — | 53.3% |
| CursorBench | 46.6% | — |
| LMArena WebDev | 1691 | — |
| FrontierSWE | 52% | — |
| SciCode | 56.4% | — |
| ALE-Bench | 2,165 | — |

## Agentic & Tool Use

- Claude Opus 5: 55.6 (#1)
- Grok 3: 30.5 (#76)

| Benchmark | Claude Opus 5 | Grok 3 |
|---|---|---|
| BALROG | 63.4% | 29.5% |
| APEX-Agents | 65.8% | — |
| OSWorld 2.0 | 31.4% | — |
| τ²-bench Banking | 48.7% | — |
| PostTrainBench | 35% | — |
| GBAEval | 79.6% | — |
| GDP.pdf | 24% | — |
| Vending-Bench 2 | 11,182 | — |

## Reasoning

- Claude Opus 5: 77.2 (#4)
- Grok 3: 13.7 (#333)

| Benchmark | Claude Opus 5 | Grok 3 |
|---|---|---|
| ARC-AGI-2 | 90.4% | 0% |
| SimpleBench | 80.6% | 36.1% |
| ARC-AGI-1 | 97.5% | 5.5% |
| LMArena Hard Prompts | 1526 | 1434 |
| Epoch Capabilities Index | 162.78 | 138.33 |
| Kagi LLM Benchmark | — | 61.3% |
| NYT Connections (extended) | 94.3% | — |
| CritPt | 29.1% | — |
| Chess Puzzles | 42% | — |
| EBR-Bench | 45.7% | — |
| Mystery Game Puzzles | 59% | — |
| DTBench | 97.9% | — |
| LMCA | 64.5% | — |
| Bench to the Future 3 | 0.12 | — |

## Math

- Claude Opus 5: 86.2 (#8)
- Grok 3: 38.0 (#145)

| Benchmark | Claude Opus 5 | Grok 3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 98.9% | 55.6% |
| LMArena Math | 1531 | 1391 |
| FrontierMath (Tiers 1-3) | 85.6% | — |
| FrontierMath Tier 4 | 73.2% | — |
| ProofBench | 99% | — |
| Omni-MATH | — | 46.4% |
| MATH Level 5 | — | 88.7% |
| FrontierMath (Feb 2025 set) | — | 3.8% |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- Claude Opus 5: 66.8 (#9)
- Grok 3: 46.2 (#82)

| Benchmark | Claude Opus 5 | Grok 3 |
|---|---|---|
| GPQA Diamond | 93.9% | 75.8% |
| LMArena Expert | 1557 | 1421 |
| SimpleQA Verified | 59.9% | — |
| MMLU-Pro | — | 78.8% |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 5.8% |
| GPQA (HELM) | — | 65% |

## Multimodal

- Claude Opus 5: 50.8 (#8)
- Grok 3: —

| Benchmark | Claude Opus 5 | Grok 3 |
|---|---|---|
| LMArena Vision | 1319 | — |
| Blueprint-Bench 2 | 30.4% | — |
| Furniture Assembly | 60.8% | — |
| LMArena Document | 1516 | — |

## Multilingual

- Claude Opus 5: 58.8 (#4)
- Grok 3: 52.3 (#87)

| Benchmark | Claude Opus 5 | Grok 3 |
|---|---|---|
| LMArena Non-English | 1501 | 1410 |
| LMArena Chinese | 1574 | 1448 |
| LMArena French | 1519 | 1460 |
| LMArena German | 1524 | 1431 |
| LMArena Japanese | 1516 | 1387 |
| LMArena Korean | 1521 | 1373 |
| LMArena Russian | 1507 | 1416 |
| LMArena Spanish | 1519 | 1417 |

## Instruction Following

- Claude Opus 5: 79.2 (#7)
- Grok 3: 75.0 (#73)

| Benchmark | Claude Opus 5 | Grok 3 |
|---|---|---|
| LMArena Instruction Following | 1517 | 1409 |
| IFEval | — | 88.4% |

## Long Context

- Claude Opus 5: 46.5 (#21)
- Grok 3: 38.7 (#192)

| Benchmark | Claude Opus 5 | Grok 3 |
|---|---|---|
| LMArena Longer Query | 1515 | 1439 |
| Fiction.LiveBench | — | 58.3% |

## Writing & Preference

- Claude Opus 5: 79.2 (#1)
- Grok 3: 55.8 (#141)

| Benchmark | Claude Opus 5 | Grok 3 |
|---|---|---|
| LMArena Text | 1507 | 1426 |
| LMArena Creative Writing | 1491 | 1414 |
| EQ-Bench Creative Writing | 2133 | 1186 |
| LMArena Multi-Turn | 1499 | 1425 |
| Short-Story Creative Writing | — | 76.4% |
| WildBench | — | 84.9% |
| EQ-Bench 4 | 1385 | — |

## FAQ

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

Claude Opus 5 is the stronger model overall, scoring 67.8 to 39.9 on the Noometry Index.

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

Claude Opus 5 scores higher on coding benchmarks: 67.5 versus 41.9 in the Noometry coding category.

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

26 benchmarks have published results for both models. Claude Opus 5 has 57 scored results on Noometry and Grok 3 has 40.