# Grok 4.5 vs Phi 3 Mini 128k Instruct

> Grok 4.5 is the stronger model overall, scoring 55.0 to 29.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-5-vs-phi-3-mini-128k-instruct
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Grok 4.5 scores higher in 8 categories and Phi 3 Mini 128k Instruct in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Grok 4.5 leads 65.8 to 27.1.
- Phi 3 Mini 128k Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| Provider | xAI | Microsoft |
| Noometry Index | 55.0 | 29.7 |
| Rank | 25 | 305 |
| Context | 500K | — |
| Input $/M | $2 | — |
| Output $/M | $6 | — |
| Weights | Proprietary | Open |

## Coding

- Grok 4.5: 52.2 (#35)
- Phi 3 Mini 128k Instruct: 28.8 (#312)

| Benchmark | Grok 4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Coding | 1474 | 1039 |
| DeepSWE | 53.8% | — |
| FrontierCode | 42.4% | — |
| LMArena WebDev | 1553 | — |
| SciCode | 54.1% | — |
| WeirdML | 46.4% | — |
| BigCodeBench Instruct | — | 29.6% |
| BigCodeBench Complete | — | 40.6% |
| ALE-Bench | 1,309 | — |

## Agentic & Tool Use

- Grok 4.5: 44.4 (#17)
- Phi 3 Mini 128k Instruct: —

| Benchmark | Grok 4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| APEX-Agents | 56.2% | — |
| τ²-bench Banking | 47.9% | — |
| PostTrainBench | 23.4% | — |
| GBAEval | 65.4% | — |
| GDP.pdf | 14% | — |
| LMArena Search | 1213 | — |
| Vending-Bench 2 | 3,887 | — |

## Reasoning

- Grok 4.5: 56.1 (#25)
- Phi 3 Mini 128k Instruct: 19.6 (#256)

| Benchmark | Grok 4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Hard Prompts | 1462 | 1028 |
| ARC-AGI-2 | 52.6% | — |
| SimpleBench | 70% | — |
| Kagi LLM Benchmark | 83.5% | — |
| NYT Connections (extended) | 79.9% | — |
| ARC-AGI-1 | 87.2% | — |
| CritPt | 15.4% | — |
| Chess Puzzles | 36% | — |
| DTBench | 96.5% | — |
| LMCA | 45.2% | — |
| Surface Evolver Bench | 74.4% | — |
| Epoch Capabilities Index | 153.92 | — |

## Math

- Grok 4.5: 60.9 (#35)
- Phi 3 Mini 128k Instruct: 31.6 (#222)

| Benchmark | Grok 4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Math | 1459 | 1089 |
| FrontierMath (Tiers 1-3) | 57.2% | — |
| FrontierMath Tier 4 | 24.4% | — |
| OTIS Mock AIME 2024-2025 | 97.8% | — |
| ProofBench | 31% | — |

## Knowledge

- Grok 4.5: 62.3 (#24)
- Phi 3 Mini 128k Instruct: 26.8 (#254)

| Benchmark | Grok 4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Expert | 1466 | 984 |
| GPQA Diamond | 93.4% | — |
| SimpleQA Verified | 48.3% | — |

## Multimodal

- Grok 4.5: 37.6 (#72)
- Phi 3 Mini 128k Instruct: —

| Benchmark | Grok 4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Vision | 1288 | — |
| Blueprint-Bench 2 | 27.3% | — |
| Furniture Assembly | 22.5% | — |
| LMArena Document | 1452 | — |

## Multilingual

- Grok 4.5: 54.4 (#42)
- Phi 3 Mini 128k Instruct: 25.2 (#285)

| Benchmark | Grok 4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Non-English | 1440 | 1000 |
| LMArena Chinese | 1496 | 1016 |
| LMArena French | 1456 | 1039 |
| LMArena German | 1446 | 1006 |
| LMArena Japanese | 1428 | 899 |
| LMArena Korean | 1404 | 856 |
| LMArena Russian | 1448 | 1004 |
| LMArena Spanish | 1450 | 1059 |

## Instruction Following

- Grok 4.5: 76.0 (#48)
- Phi 3 Mini 128k Instruct: 51.8 (#294)

| Benchmark | Grok 4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Instruction Following | 1446 | 1023 |

## Long Context

- Grok 4.5: 44.8 (#56)
- Phi 3 Mini 128k Instruct: 30.4 (#289)

| Benchmark | Grok 4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Longer Query | 1463 | 996 |

## Writing & Preference

- Grok 4.5: 65.8 (#42)
- Phi 3 Mini 128k Instruct: 27.1 (#301)

| Benchmark | Grok 4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Text | 1448 | 1050 |
| LMArena Creative Writing | 1442 | 1024 |
| LMArena Multi-Turn | 1456 | 989 |
| EQ-Bench Creative Writing | 1579 | — |

## FAQ

### Is Grok 4.5 better than Phi 3 Mini 128k Instruct?

Grok 4.5 is the stronger model overall, scoring 55.0 to 29.7 on the Noometry Index.

### Is Grok 4.5 or Phi 3 Mini 128k Instruct better for coding?

Grok 4.5 scores higher on coding benchmarks: 52.2 versus 28.8 in the Noometry coding category.

### How many benchmarks do Grok 4.5 and Phi 3 Mini 128k Instruct share?

17 benchmarks have published results for both models. Grok 4.5 has 52 scored results on Noometry and Phi 3 Mini 128k Instruct has 19.