# Grok 4.3 vs Phi 3 Mini 128k Instruct

> Grok 4.3 is the stronger model overall, scoring 43.8 to 29.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-3-vs-phi-3-mini-128k-instruct
- Last updated: 2026-10-11
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Grok 4.3 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 4.3 leads 58.5 to 27.1.
- Phi 3 Mini 128k Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.3 | Phi 3 Mini 128k Instruct |
|---|---|---|
| Provider | xAI | Microsoft |
| Noometry Index | 43.8 | 29.7 |
| Rank | 86 | 305 |
| Context | 1M | — |
| Input $/M | $1.25 | — |
| Output $/M | $2.50 | — |
| Weights | Proprietary | Open |

## Coding

- Grok 4.3: 41.6 (#121)
- Phi 3 Mini 128k Instruct: 28.8 (#312)

| Benchmark | Grok 4.3 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Coding | 1415 | 1039 |
| LMArena WebDev | 1357 | — |
| SciCode | 47.3% | — |
| WeirdML | 49.9% | — |
| BigCodeBench Instruct | — | 29.6% |
| BigCodeBench Complete | — | 40.6% |
| ALE-Bench | 944.17 | — |

## Agentic & Tool Use

- Grok 4.3: 27.7 (#99)
- Phi 3 Mini 128k Instruct: —

| Benchmark | Grok 4.3 | Phi 3 Mini 128k Instruct |
|---|---|---|
| GDP.pdf | 8% | — |
| LMArena Search | 1165 | — |
| Vending-Bench 2 | 35.26 | — |

## Reasoning

- Grok 4.3: 35.9 (#68)
- Phi 3 Mini 128k Instruct: 19.6 (#256)

| Benchmark | Grok 4.3 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Hard Prompts | 1396 | 1028 |
| NYT Connections (extended) | 55.2% | — |
| CritPt | 8% | — |
| Chess Puzzles | 25% | — |
| DTBench | 90.7% | — |
| LMCA | 38.3% | — |
| Epoch Capabilities Index | 149.16 | — |
| ForecastBench | 60.3 | — |

## Math

- Grok 4.3: 46.0 (#74)
- Phi 3 Mini 128k Instruct: 31.6 (#222)

| Benchmark | Grok 4.3 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Math | 1388 | 1089 |
| FrontierMath (Tiers 1-3) | 42.8% | — |
| FrontierMath Tier 4 | 14.6% | — |
| OTIS Mock AIME 2024-2025 | 93.3% | — |
| ProofBench | 11% | — |

## Knowledge

- Grok 4.3: 52.5 (#62)
- Phi 3 Mini 128k Instruct: 26.8 (#254)

| Benchmark | Grok 4.3 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Expert | 1385 | 984 |
| GPQA Diamond | 88.8% | — |
| SimpleQA Verified | 33.2% | — |

## Multimodal

- Grok 4.3: 31.6 (#104)
- Phi 3 Mini 128k Instruct: —

| Benchmark | Grok 4.3 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Vision | 1229 | — |
| Blueprint-Bench 2 | 0% | — |

## Multilingual

- Grok 4.3: 50.5 (#120)
- Phi 3 Mini 128k Instruct: 25.2 (#285)

| Benchmark | Grok 4.3 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Non-English | 1385 | 1000 |
| LMArena Chinese | 1422 | 1016 |
| LMArena French | 1412 | 1039 |
| LMArena German | 1395 | 1006 |
| LMArena Japanese | 1379 | 899 |
| LMArena Korean | 1356 | 856 |
| LMArena Russian | 1399 | 1004 |
| LMArena Spanish | 1398 | 1059 |

## Instruction Following

- Grok 4.3: 72.1 (#140)
- Phi 3 Mini 128k Instruct: 51.8 (#294)

| Benchmark | Grok 4.3 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Instruction Following | 1366 | 1023 |

## Long Context

- Grok 4.3: 42.5 (#123)
- Phi 3 Mini 128k Instruct: 30.4 (#289)

| Benchmark | Grok 4.3 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Longer Query | 1393 | 996 |

## Writing & Preference

- Grok 4.3: 58.5 (#118)
- Phi 3 Mini 128k Instruct: 27.1 (#301)

| Benchmark | Grok 4.3 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Text | 1397 | 1050 |
| LMArena Creative Writing | 1380 | 1024 |
| LMArena Multi-Turn | 1406 | 989 |
| EQ-Bench 4 | 1075 | — |

## FAQ

### Is Grok 4.3 better than Phi 3 Mini 128k Instruct?

Grok 4.3 is the stronger model overall, scoring 43.8 to 29.7 on the Noometry Index.

### Is Grok 4.3 or Phi 3 Mini 128k Instruct better for coding?

Grok 4.3 scores higher on coding benchmarks: 41.6 versus 28.8 in the Noometry coding category.

### How many benchmarks do Grok 4.3 and Phi 3 Mini 128k Instruct share?

17 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and Phi 3 Mini 128k Instruct has 19.