# Claude 2 vs Grok 4 Fast

> Grok 4 Fast is the stronger model overall, scoring 39.4 to 25.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-2-vs-grok-4-fast
- Last updated: 2026-10-11
- Shared benchmarks: 2

## Summary

- They share 2 benchmarks with published results for both. Claude 2 scores higher in 0 categories and Grok 4 Fast in 3 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in math, where Grok 4 Fast leads 38.9 to 9.3.
- The biggest single-benchmark swing is DTBench: 51.9% for Claude 2 and 82.7% for Grok 4 Fast.

## Snapshot

| | Claude 2 | Grok 4 Fast |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 25.0 | 39.4 |
| Rank | 346 | 167 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 2: —
- Grok 4 Fast: 32.5 (#271)

| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | — | 1159 |
| WeirdML | — | 42.9% |
| LMArena Coding | — | 1429 |
| HumanEval+ | 61.6% | — |

## Agentic & Tool Use

- Claude 2: —
- Grok 4 Fast: 29.5 (#86)

| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |

## Reasoning

- Claude 2: 21.7 (#216)
- Grok 4 Fast: 22.2 (#201)

| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| DTBench | 51.9% | 82.7% |
| Epoch Capabilities Index | 120.13 | 144.2 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| ARC-AGI-1 | — | 48.5% |
| LMArena Hard Prompts | — | 1412 |
| ForecastBench | — | 60.5 |

## Math

- Claude 2: 9.3 (#320)
- Grok 4 Fast: 38.9 (#123)

| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | — |
| LMArena Math | — | 1419 |
| MATH Level 5 | 11.7% | — |

## Knowledge

- Claude 2: 16.9 (#287)
- Grok 4 Fast: 32.0 (#214)

| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| GPQA Diamond | 34.7% | — |
| Vectara Hallucination Rate | — | 19.7% |
| LMArena Expert | — | 1411 |
| MMLU | 78.5% | — |
| TriviaQA | 87.5% | — |

## Multilingual

- Claude 2: —
- Grok 4 Fast: 51.3 (#111)

| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | — | 1396 |
| LMArena Chinese | — | 1457 |
| LMArena French | — | 1431 |
| LMArena German | — | 1383 |
| LMArena Japanese | — | 1352 |
| LMArena Korean | — | 1357 |
| LMArena Russian | — | 1389 |
| LMArena Spanish | — | 1415 |

## Instruction Following

- Claude 2: —
- Grok 4 Fast: 73.2 (#121)

| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | — | 1387 |

## Long Context

- Claude 2: —
- Grok 4 Fast: 63.2 (#3)

| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| Fiction.LiveBench | — | 94.4% |
| LMArena Longer Query | — | 1415 |

## Writing & Preference

- Claude 2: —
- Grok 4 Fast: 60.0 (#102)

| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| LMArena Text | — | 1407 |
| LMArena Creative Writing | — | 1387 |
| LMArena Multi-Turn | — | 1414 |

## FAQ

### Is Claude 2 better than Grok 4 Fast?

Grok 4 Fast is the stronger model overall, scoring 39.4 to 25.0 on the Noometry Index.

### How many benchmarks do Claude 2 and Grok 4 Fast share?

2 benchmarks have published results for both models. Claude 2 has 8 scored results on Noometry and Grok 4 Fast has 30.