# Claude Instant vs Grok 4 Fast

> Grok 4 Fast has enough public results to be ranked (#164); Claude Instant does not yet, so treat this comparison as directional.

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

## Summary

- They share 2 benchmarks with published results for both. Claude Instant scores higher in 0 categories and Grok 4 Fast in 1 category; one gap is clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4 Fast leads 22.5 to 18.8.
- The biggest single-benchmark swing is DTBench: 45.8% for Claude Instant and 82.7% for Grok 4 Fast.

## Snapshot

| | Claude Instant | Grok 4 Fast |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 28.8 | 39.0 |
| Rank | — | 164 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Instant: —
- Grok 4 Fast: 32.3 (#264)

| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | — | 1160 |
| WeirdML | — | 42.9% |
| LMArena Coding | — | 1429 |
| HumanEval+ | 50.6% | — |

## Agentic & Tool Use

- Claude Instant: —
- Grok 4 Fast: 29.3 (#80)

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

## Reasoning

- Claude Instant: 18.8
- Grok 4 Fast: 22.5 (#179)

| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| DTBench | 45.8% | 82.7% |
| Epoch Capabilities Index | 120.2 | 144.21 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| ARC-AGI-1 | — | 48.5% |
| LMArena Hard Prompts | — | 1413 |
| ForecastBench | — | 60.5 |

## Math

- Claude Instant: —
- Grok 4 Fast: 36.1 (#126)

| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| LMArena Math | — | 1419 |
| GSM8K | 86.7% | — |

## Knowledge

- Claude Instant: —
- Grok 4 Fast: 31.5 (#211)

| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| Vectara Hallucination Rate | — | 19.7% |
| LMArena Expert | — | 1411 |
| ARC (AI2) Challenge | 86.3% | — |
| MMLU | 73.4% | — |
| TriviaQA | 78.9% | — |

## Multilingual

- Claude Instant: —
- Grok 4 Fast: 51.5 (#106)

| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | — | 1397 |
| LMArena Chinese | — | 1458 |
| LMArena French | — | 1433 |
| LMArena German | — | 1383 |
| LMArena Japanese | — | 1358 |
| LMArena Korean | — | 1359 |
| LMArena Russian | — | 1387 |
| LMArena Spanish | — | 1414 |

## Instruction Following

- Claude Instant: —
- Grok 4 Fast: 73.4 (#116)

| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | — | 1388 |

## Long Context

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

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

## Writing & Preference

- Claude Instant: —
- Grok 4 Fast: 60.2 (#96)

| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| LMArena Text | — | 1407 |
| LMArena Creative Writing | — | 1388 |
| LMArena Multi-Turn | — | 1414 |

## FAQ

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

Grok 4 Fast has enough public results to be ranked (#164); Claude Instant does not yet, so treat this comparison as directional.

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

2 benchmarks have published results for both models. Claude Instant has 7 scored results on Noometry and Grok 4 Fast has 30.