# Grok 4 Fast vs Phi-4 Mini

> Grok 4 Fast is the stronger model overall, scoring 39.0 to 30.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-fast-vs-phi-4-mini
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Grok 4 Fast scores higher in 3 categories and Phi-4 Mini in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 4 Fast leads 31.5 to 24.8.
- Phi-4 Mini has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4 Fast | Phi-4 Mini |
|---|---|---|
| Provider | xAI | Microsoft |
| Noometry Index | 39.0 | 30.4 |
| Rank | 164 | 280 |
| Context | — | 128K |
| Input $/M | — | $0.075 |
| Output $/M | — | $0.30 |
| Weights | Proprietary | Open |

## Coding

- Grok 4 Fast: 32.3 (#264)
- Phi-4 Mini: 27.6 (#312)

| Benchmark | Grok 4 Fast | Phi-4 Mini |
|---|---|---|
| LMArena WebDev | 1160 | — |
| SciCode | — | 10.8% |
| WeirdML | 42.9% | — |
| LMArena Coding | 1429 | — |

## Agentic & Tool Use

- Grok 4 Fast: 29.3 (#80)
- Phi-4 Mini: —

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

## Reasoning

- Grok 4 Fast: 22.5 (#179)
- Phi-4 Mini: 21.7 (#190)

| Benchmark | Grok 4 Fast | Phi-4 Mini |
|---|---|---|
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| CritPt | — | 0% |
| LMArena Hard Prompts | 1413 | — |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.21 | — |
| ForecastBench | 60.5 | — |

## Math

- Grok 4 Fast: 36.1 (#126)
- Phi-4 Mini: —

| Benchmark | Grok 4 Fast | Phi-4 Mini |
|---|---|---|
| LMArena Math | 1419 | — |

## Knowledge

- Grok 4 Fast: 31.5 (#211)
- Phi-4 Mini: 24.8 (#261)

| Benchmark | Grok 4 Fast | Phi-4 Mini |
|---|---|---|
| Vectara Hallucination Rate | 19.7% | 23.5% |
| LMArena Expert | 1411 | — |

## Multilingual

- Grok 4 Fast: 51.5 (#106)
- Phi-4 Mini: —

| Benchmark | Grok 4 Fast | Phi-4 Mini |
|---|---|---|
| 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

- Grok 4 Fast: 73.4 (#116)
- Phi-4 Mini: —

| Benchmark | Grok 4 Fast | Phi-4 Mini |
|---|---|---|
| LMArena Instruction Following | 1388 | — |

## Long Context

- Grok 4 Fast: 63.2 (#3)
- Phi-4 Mini: —

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

## Writing & Preference

- Grok 4 Fast: 60.2 (#96)
- Phi-4 Mini: —

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

## FAQ

### Is Grok 4 Fast better than Phi-4 Mini?

Grok 4 Fast is the stronger model overall, scoring 39.0 to 30.4 on the Noometry Index.

### Is Grok 4 Fast or Phi-4 Mini better for coding?

Grok 4 Fast scores higher on coding benchmarks: 32.3 versus 27.6 in the Noometry coding category.

### How many benchmarks do Grok 4 Fast and Phi-4 Mini share?

1 benchmark has published results for both models. Grok 4 Fast has 30 scored results on Noometry and Phi-4 Mini has 3.