# Grok 4.1 Fast vs phi-3-medium 14B

> Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 29.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-phi-3-medium-14b
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in knowledge, where Grok 4.1 Fast leads 32.6 to 9.1.
- phi-3-medium 14B has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 Fast | phi-3-medium 14B |
|---|---|---|
| Provider | xAI | Microsoft |
| Noometry Index | 40.9 | 29.1 |
| Rank | 131 | 306 |
| Context | 128K | — |
| Input $/M | $0.20 | — |
| Output $/M | $0.50 | — |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1 Fast: 33.8 (#236)
- phi-3-medium 14B: 36.3 (#198)

| Benchmark | Grok 4.1 Fast | phi-3-medium 14B |
|---|---|---|
| LMArena WebDev | 1241 | — |
| BigCodeBench Instruct | — | 37.6% |
| LMArena Coding | 1411 | — |
| BigCodeBench Complete | — | 48.7% |
| ALE-Bench | 394.93 | — |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.1 (#35)
- phi-3-medium 14B: —

| Benchmark | Grok 4.1 Fast | phi-3-medium 14B |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |

## Reasoning

- Grok 4.1 Fast: 42.3 (#45)
- phi-3-medium 14B: —

| Benchmark | Grok 4.1 Fast | phi-3-medium 14B |
|---|---|---|
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| LMArena Hard Prompts | 1407 | — |
| DTBench | 87.7% | — |
| Adversarial NLI | — | 55.8% |
| BIG-Bench Hard | — | 81.4% |
| Epoch Capabilities Index | — | 121.18 |
| ForecastBench | 61 | — |
| HellaSwag | — | 82.4% |
| WinoGrande | — | 81.5% |

## Math

- Grok 4.1 Fast: 30.9 (#201)
- phi-3-medium 14B: 25.2 (#249)

| Benchmark | Grok 4.1 Fast | phi-3-medium 14B |
|---|---|---|
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |
| LMArena Math | 1408 | — |
| MATH Level 5 | — | 17.6% |

## Knowledge

- Grok 4.1 Fast: 32.6 (#203)
- phi-3-medium 14B: 9.1 (#301)

| Benchmark | Grok 4.1 Fast | phi-3-medium 14B |
|---|---|---|
| GPQA Diamond | — | 27.6% |
| Vectara Hallucination Rate | 17.8% | — |
| LMArena Expert | 1398 | — |
| ARC (AI2) Challenge | — | 91.6% |
| MMLU | — | 78% |
| OpenBookQA | — | 87.4% |
| TriviaQA | — | 73.9% |

## Multimodal

- Grok 4.1 Fast: 36.3 (#71)
- phi-3-medium 14B: —

| Benchmark | Grok 4.1 Fast | phi-3-medium 14B |
|---|---|---|
| LMArena Vision | 1201 | — |

## Multilingual

- Grok 4.1 Fast: 51.1 (#110)
- phi-3-medium 14B: —

| Benchmark | Grok 4.1 Fast | phi-3-medium 14B |
|---|---|---|
| LMArena Non-English | 1391 | — |
| LMArena Chinese | 1441 | — |
| LMArena French | 1416 | — |
| LMArena German | 1404 | — |
| LMArena Japanese | 1347 | — |
| LMArena Korean | 1361 | — |
| LMArena Russian | 1387 | — |
| LMArena Spanish | 1411 | — |

## Instruction Following

- Grok 4.1 Fast: 72.8 (#127)
- phi-3-medium 14B: —

| Benchmark | Grok 4.1 Fast | phi-3-medium 14B |
|---|---|---|
| LMArena Instruction Following | 1376 | — |

## Long Context

- Grok 4.1 Fast: 42.4 (#121)
- phi-3-medium 14B: —

| Benchmark | Grok 4.1 Fast | phi-3-medium 14B |
|---|---|---|
| LMArena Longer Query | 1390 | — |

## Writing & Preference

- Grok 4.1 Fast: 57.4 (#126)
- phi-3-medium 14B: —

| Benchmark | Grok 4.1 Fast | phi-3-medium 14B |
|---|---|---|
| LMArena Text | 1408 | — |
| LMArena Creative Writing | 1394 | — |
| EQ-Bench Creative Writing | 1327 | — |
| LMArena Multi-Turn | 1389 | — |

## FAQ

### Is Grok 4.1 Fast better than phi-3-medium 14B?

Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 29.1 on the Noometry Index.

### Is Grok 4.1 Fast or phi-3-medium 14B better for coding?

phi-3-medium 14B scores higher on coding benchmarks: 36.3 versus 33.8 in the Noometry coding category.

### How many benchmarks do Grok 4.1 Fast and phi-3-medium 14B share?

0 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and phi-3-medium 14B has 13.