# GPT-4.5 vs Phi 3 Mini 128k Instruct

> GPT-4.5 is the stronger model overall, scoring 37.2 to 29.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-4-5-vs-phi-3-mini-128k-instruct
- Last updated: 2026-10-10
- Shared benchmarks: 16

## Summary

- They share 16 benchmarks with published results for both. GPT-4.5 scores higher in 7 categories and Phi 3 Mini 128k Instruct in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GPT-4.5 leads 56.9 to 27.1.
- Phi 3 Mini 128k Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 37.2 | 29.7 |
| Rank | 208 | 305 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Open |

## Coding

- GPT-4.5: 42.2 (#109)
- Phi 3 Mini 128k Instruct: 28.8 (#312)

| Benchmark | GPT-4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Coding | 1396 | 1039 |
| Aider Polyglot | 44.9% | — |
| WeirdML | 39.4% | — |
| BigCodeBench Instruct | — | 29.6% |
| LiveBench Coding | 75.2% | — |
| BigCodeBench Complete | — | 40.6% |

## Agentic & Tool Use

- GPT-4.5: 27.9 (#97)
- Phi 3 Mini 128k Instruct: —

| Benchmark | GPT-4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| Cybench | 17.5% | — |

## Reasoning

- GPT-4.5: 13.9 (#330)
- Phi 3 Mini 128k Instruct: 19.6 (#256)

| Benchmark | GPT-4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Hard Prompts | 1403 | 1028 |
| ARC-AGI-2 | 0.8% | — |
| SimpleBench | 34.5% | — |
| ARC-AGI-1 | 10.3% | — |
| EnigmaEval | 3.2% | — |
| LiveBench Reasoning | 71.1% | — |
| LiveBench Data Analysis | 64.3% | — |
| Epoch Capabilities Index | 136.74 | — |
| ForecastBench | 61.7 | — |
| LiveBench | 69% | — |

## Math

- GPT-4.5: 32.6 (#211)
- Phi 3 Mini 128k Instruct: 31.6 (#222)

| Benchmark | GPT-4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Math | 1412 | 1089 |
| OTIS Mock AIME 2024-2025 | 37.8% | — |
| LiveBench Math | 69.3% | — |
| MATH Level 5 | 78.6% | — |

## Knowledge

- GPT-4.5: 32.5 (#211)
- Phi 3 Mini 128k Instruct: 26.8 (#254)

| Benchmark | GPT-4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Expert | 1394 | 984 |
| GPQA Diamond | 68.7% | — |
| Humanity's Last Exam | 5.4% | — |
| Confabulations | 13.6% | — |

## Multimodal

- GPT-4.5: 37.6 (#71)
- Phi 3 Mini 128k Instruct: —

| Benchmark | GPT-4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Vision | 1195 | — |
| VPCT | 45% | — |

## Multilingual

- GPT-4.5: 52.5 (#83)
- Phi 3 Mini 128k Instruct: 25.2 (#285)

| Benchmark | GPT-4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Non-English | 1413 | 1000 |
| LMArena Chinese | 1421 | 1016 |
| LMArena French | 1418 | 1039 |
| LMArena German | 1457 | 1006 |
| LMArena Japanese | 1416 | 899 |
| LMArena Korean | 1392 | 856 |
| LMArena Russian | 1419 | 1004 |
| LMArena Spanish | — | 1059 |

## Instruction Following

- GPT-4.5: 72.6 (#134)
- Phi 3 Mini 128k Instruct: 51.8 (#294)

| Benchmark | GPT-4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Instruction Following | 1404 | 1023 |
| LiveBench Instruction Following | 72.3% | — |

## Long Context

- GPT-4.5: 40.4 (#155)
- Phi 3 Mini 128k Instruct: 30.4 (#289)

| Benchmark | GPT-4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Longer Query | 1406 | 996 |
| Fiction.LiveBench | 63.9% | — |

## Writing & Preference

- GPT-4.5: 56.9 (#134)
- Phi 3 Mini 128k Instruct: 27.1 (#301)

| Benchmark | GPT-4.5 | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Text | 1417 | 1050 |
| LMArena Creative Writing | 1394 | 1024 |
| LMArena Multi-Turn | 1444 | 989 |
| Short-Story Creative Writing | 75.6% | — |
| EQ-Bench Creative Writing | 1258 | — |
| LiveBench Language | 61.5% | — |

## FAQ

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

GPT-4.5 is the stronger model overall, scoring 37.2 to 29.7 on the Noometry Index.

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

GPT-4.5 scores higher on coding benchmarks: 42.2 versus 28.8 in the Noometry coding category.

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

16 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and Phi 3 Mini 128k Instruct has 19.