# o3-pro vs Phi 3 Mini 128k Instruct

> o3-pro is the stronger model overall, scoring 42.7 to 29.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/o3-pro-vs-phi-3-mini-128k-instruct
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in long context, where o3-pro leads 72.1 to 30.3.
- Phi 3 Mini 128k Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | o3-pro | Phi 3 Mini 128k Instruct |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 42.7 | 29.1 |
| Rank | 94 | 303 |
| Context | 200K | — |
| Input $/M | $20 | — |
| Output $/M | $80 | — |
| Weights | Proprietary | Open |

## Coding

- o3-pro: 55.1 (#22)
- Phi 3 Mini 128k Instruct: 28.3 (#307)

| Benchmark | o3-pro | Phi 3 Mini 128k Instruct |
|---|---|---|
| Aider Polyglot | 84.9% | — |
| WeirdML | 58.2% | — |
| BigCodeBench Instruct | — | 29.6% |
| LMArena Coding | — | 1040 |
| BigCodeBench Complete | — | 40.6% |

## Reasoning

- o3-pro: 24.1 (#152)
- Phi 3 Mini 128k Instruct: 18.7 (#254)

| Benchmark | o3-pro | Phi 3 Mini 128k Instruct |
|---|---|---|
| ARC-AGI-2 | 4.9% | — |
| Kagi LLM Benchmark | 72.1% | — |
| ARC-AGI-1 | 59.3% | — |
| LMArena Hard Prompts | — | 1028 |
| DTBench | 86.9% | — |
| LMCA | 38.5% | — |
| Epoch Capabilities Index | 147.43 | — |

## Math

- o3-pro: —
- Phi 3 Mini 128k Instruct: 29.2 (#220)

| Benchmark | o3-pro | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Math | — | 1089 |

## Knowledge

- o3-pro: 29.0 (#234)
- Phi 3 Mini 128k Instruct: 26.3 (#251)

| Benchmark | o3-pro | Phi 3 Mini 128k Instruct |
|---|---|---|
| Confabulations | 14.2% | — |
| Vectara Hallucination Rate | 23.3% | — |
| LMArena Expert | — | 984 |

## Multilingual

- o3-pro: —
- Phi 3 Mini 128k Instruct: 25.4 (#280)

| Benchmark | o3-pro | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Non-English | — | 1000 |
| LMArena Chinese | — | 1016 |
| LMArena French | — | 1038 |
| LMArena German | — | 1006 |
| LMArena Japanese | — | 899 |
| LMArena Korean | — | 856 |
| LMArena Russian | — | 1004 |
| LMArena Spanish | — | 1058 |

## Instruction Following

- o3-pro: —
- Phi 3 Mini 128k Instruct: 52.1 (#289)

| Benchmark | o3-pro | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Instruction Following | — | 1023 |

## Long Context

- o3-pro: 72.1 (#1)
- Phi 3 Mini 128k Instruct: 30.3 (#284)

| Benchmark | o3-pro | Phi 3 Mini 128k Instruct |
|---|---|---|
| Fiction.LiveBench | 97.2% | — |
| LMArena Longer Query | — | 996 |

## Writing & Preference

- o3-pro: 57.1 (#128)
- Phi 3 Mini 128k Instruct: 27.3 (#296)

| Benchmark | o3-pro | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Text | — | 1050 |
| LMArena Creative Writing | — | 1024 |
| Short-Story Creative Writing | 84.4% | — |
| LMArena Multi-Turn | — | 989 |

## FAQ

### Is o3-pro better than Phi 3 Mini 128k Instruct?

o3-pro is the stronger model overall, scoring 42.7 to 29.1 on the Noometry Index.

### Is o3-pro or Phi 3 Mini 128k Instruct better for coding?

o3-pro scores higher on coding benchmarks: 55.1 versus 28.3 in the Noometry coding category.

### How many benchmarks do o3-pro and Phi 3 Mini 128k Instruct share?

0 benchmarks have published results for both models. o3-pro has 12 scored results on Noometry and Phi 3 Mini 128k Instruct has 19.