# Grok 4.1 Fast vs Phi-2

> Grok 4.1 Fast has enough public results to be ranked (#136); Phi-2 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-phi-2
- Last updated: 2026-10-12
- Shared benchmarks: 0

## Summary

- Phi-2 has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| Provider | xAI | Microsoft |
| Noometry Index | 41.4 | — |
| Rank | 136 | — |
| Context | 128K | — |
| Input $/M | $0.20 | — |
| Output $/M | $0.50 | — |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1 Fast: 34.1 (#245)
- Phi-2: —

| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| LMArena WebDev | 1242 | — |
| LMArena Coding | 1411 | — |
| ALE-Bench | 394.93 | — |
| HumanEval+ | — | 45.1% |
| MBPP+ | — | 54.2% |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.3 (#39)
- Phi-2: —

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

## Reasoning

- Grok 4.1 Fast: 43.4 (#49)
- Phi-2: —

| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| LMArena Hard Prompts | 1407 | — |
| DTBench | 87.7% | — |
| Adversarial NLI | — | 42.5% |
| BIG-Bench Hard | — | 59.4% |
| Epoch Capabilities Index | — | 107.94 |
| ForecastBench | 61 | — |
| HellaSwag | — | 53.6% |
| WinoGrande | — | 54.7% |

## Math

- Grok 4.1 Fast: 31.9 (#221)
- Phi-2: —

| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |
| LMArena Math | 1408 | — |

## Knowledge

- Grok 4.1 Fast: 33.1 (#207)
- Phi-2: —

| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| Vectara Hallucination Rate | 17.8% | — |
| LMArena Expert | 1399 | — |
| ARC (AI2) Challenge | — | 75.9% |
| MMLU | — | 58.4% |
| OpenBookQA | — | 73.6% |
| TriviaQA | — | 45.2% |

## Multimodal

- Grok 4.1 Fast: 37.0 (#76)
- Phi-2: —

| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| LMArena Vision | 1201 | — |

## Multilingual

- Grok 4.1 Fast: 51.0 (#114)
- Phi-2: —

| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| LMArena Non-English | 1391 | — |
| LMArena Chinese | 1441 | — |
| LMArena French | 1415 | — |
| LMArena German | 1404 | — |
| LMArena Japanese | 1349 | — |
| LMArena Korean | 1361 | — |
| LMArena Russian | 1387 | — |
| LMArena Spanish | 1413 | — |

## Instruction Following

- Grok 4.1 Fast: 72.7 (#133)
- Phi-2: —

| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| LMArena Instruction Following | 1376 | — |

## Long Context

- Grok 4.1 Fast: 42.4 (#126)
- Phi-2: —

| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| LMArena Longer Query | 1390 | — |

## Writing & Preference

- Grok 4.1 Fast: 57.2 (#131)
- Phi-2: —

| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| 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-2?

Grok 4.1 Fast has enough public results to be ranked (#136); Phi-2 does not yet, so treat this comparison as directional.

### How many benchmarks do Grok 4.1 Fast and Phi-2 share?

0 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Phi-2 has 11.