# Claude 3 Haiku vs Grok 4 Fast

> Grok 4 Fast is the stronger model overall, scoring 39.0 to 25.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-haiku-vs-grok-4-fast
- Last updated: 2026-10-10
- Shared benchmarks: 22

## Summary

- They share 22 benchmarks with published results for both. Claude 3 Haiku scores higher in 0 categories and Grok 4 Fast in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Grok 4 Fast leads 60.2 to 29.8.
- The biggest single-benchmark swing is WeirdML: 9.8% for Claude 3 Haiku and 42.9% for Grok 4 Fast.

## Snapshot

| | Claude 3 Haiku | Grok 4 Fast |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 25.7 | 39.0 |
| Rank | 333 | 164 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 3 Haiku: 26.1 (#320)
- Grok 4 Fast: 32.3 (#264)

| Benchmark | Claude 3 Haiku | Grok 4 Fast |
|---|---|---|
| WeirdML | 9.8% | 42.9% |
| LMArena Coding | 1199 | 1429 |
| LMArena WebDev | — | 1160 |
| BigCodeBench Instruct | 39.4% | — |
| BigCodeBench Complete | 50.1% | — |
| CadEval | 12% | — |
| HumanEval+ | 68.9% | — |
| MBPP+ | 68.8% | — |

## Agentic & Tool Use

- Claude 3 Haiku: —
- Grok 4 Fast: 29.3 (#80)

| Benchmark | Claude 3 Haiku | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |

## Reasoning

- Claude 3 Haiku: 15.7 (#303)
- Grok 4 Fast: 22.5 (#179)

| Benchmark | Claude 3 Haiku | Grok 4 Fast |
|---|---|---|
| Kagi LLM Benchmark | 34.2% | 66.1% |
| LMArena Hard Prompts | 1174 | 1413 |
| DTBench | 50.1% | 82.7% |
| Epoch Capabilities Index | 118.3 | 144.21 |
| ForecastBench | 53.2 | 60.5 |
| ARC-AGI-2 | — | 5.3% |
| ARC-AGI-1 | — | 48.5% |
| LMCA | 8.8% | — |
| WinoGrande | 74.2% | — |

## Math

- Claude 3 Haiku: 9.2 (#313)
- Grok 4 Fast: 36.1 (#126)

| Benchmark | Claude 3 Haiku | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1188 | 1419 |
| OTIS Mock AIME 2024-2025 | 1.8% | — |
| MATH Level 5 | 14.9% | — |

## Knowledge

- Claude 3 Haiku: 17.3 (#280)
- Grok 4 Fast: 31.5 (#211)

| Benchmark | Claude 3 Haiku | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1148 | 1411 |
| GPQA Diamond | 36.3% | — |
| Confabulations | 34.2% | — |
| Vectara Hallucination Rate | — | 19.7% |
| MMLU | 73.8% | — |

## Multimodal

- Claude 3 Haiku: 23.1 (#123)
- Grok 4 Fast: —

| Benchmark | Claude 3 Haiku | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 950 | — |
| ScienceQA | 72% | — |

## Multilingual

- Claude 3 Haiku: 36.1 (#238)
- Grok 4 Fast: 51.5 (#106)

| Benchmark | Claude 3 Haiku | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1178 | 1397 |
| LMArena Chinese | 1155 | 1458 |
| LMArena French | 1194 | 1433 |
| LMArena German | 1174 | 1383 |
| LMArena Japanese | 1102 | 1358 |
| LMArena Korean | 1108 | 1359 |
| LMArena Russian | 1204 | 1387 |
| LMArena Spanish | 1165 | 1414 |

## Instruction Following

- Claude 3 Haiku: 61.5 (#242)
- Grok 4 Fast: 73.4 (#116)

| Benchmark | Claude 3 Haiku | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1174 | 1388 |

## Long Context

- Claude 3 Haiku: 36.1 (#232)
- Grok 4 Fast: 63.2 (#3)

| Benchmark | Claude 3 Haiku | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1191 | 1415 |
| Fiction.LiveBench | — | 94.4% |

## Writing & Preference

- Claude 3 Haiku: 29.8 (#286)
- Grok 4 Fast: 60.2 (#96)

| Benchmark | Claude 3 Haiku | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1195 | 1407 |
| LMArena Creative Writing | 1157 | 1388 |
| LMArena Multi-Turn | 1190 | 1414 |
| EQ-Bench Creative Writing | 717 | — |

## FAQ

### Is Claude 3 Haiku better than Grok 4 Fast?

Grok 4 Fast is the stronger model overall, scoring 39.0 to 25.7 on the Noometry Index.

### Is Claude 3 Haiku or Grok 4 Fast better for coding?

Grok 4 Fast scores higher on coding benchmarks: 32.3 versus 26.1 in the Noometry coding category.

### How many benchmarks do Claude 3 Haiku and Grok 4 Fast share?

22 benchmarks have published results for both models. Claude 3 Haiku has 37 scored results on Noometry and Grok 4 Fast has 30.