# GPT-6 Luna vs Phi 3 Mini 128k Instruct

> GPT-6 Luna is the stronger model overall, scoring 45.1 to 29.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-6-luna-vs-phi-3-mini-128k-instruct
- Last updated: 2026-10-10
- Shared benchmarks: 13

## Summary

- They share 13 benchmarks with published results for both. GPT-6 Luna 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 GPT-6 Luna leads 58.4 to 27.3.
- Phi 3 Mini 128k Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-6 Luna | Phi 3 Mini 128k Instruct |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 45.1 | 29.1 |
| Rank | 65 | 303 |
| Context | 1.05M | — |
| Input $/M | $0.10 | — |
| Output $/M | $0.50 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-6 Luna: 54.7 (#24)
- Phi 3 Mini 128k Instruct: 28.3 (#307)

| Benchmark | GPT-6 Luna | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Coding | 1448 | 1040 |
| DeepSWE | 66.6% | — |
| FrontierCode | 42.4% | — |
| LMArena WebDev | 1583 | — |
| BigCodeBench Instruct | — | 29.6% |
| BigCodeBench Complete | — | 40.6% |

## Reasoning

- GPT-6 Luna: 31.7 (#68)
- Phi 3 Mini 128k Instruct: 18.7 (#254)

| Benchmark | GPT-6 Luna | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Hard Prompts | 1415 | 1028 |
| NYT Connections (extended) | 68.7% | — |

## Math

- GPT-6 Luna: 35.6 (#140)
- Phi 3 Mini 128k Instruct: 29.2 (#220)

| Benchmark | GPT-6 Luna | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Math | 1396 | 1089 |

## Knowledge

- GPT-6 Luna: 40.1 (#110)
- Phi 3 Mini 128k Instruct: 26.3 (#251)

| Benchmark | GPT-6 Luna | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Expert | 1458 | 984 |

## Multimodal

- GPT-6 Luna: 42.0 (#27)
- Phi 3 Mini 128k Instruct: —

| Benchmark | GPT-6 Luna | Phi 3 Mini 128k Instruct |
|---|---|---|
| Furniture Assembly | 44.2% | — |

## Multilingual

- GPT-6 Luna: 51.0 (#111)
- Phi 3 Mini 128k Instruct: 25.4 (#280)

| Benchmark | GPT-6 Luna | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Non-English | 1390 | 1000 |
| LMArena Chinese | 1425 | 1016 |
| LMArena Russian | 1392 | 1004 |
| LMArena Spanish | 1416 | 1058 |
| LMArena French | — | 1038 |
| LMArena German | — | 1006 |
| LMArena Japanese | — | 899 |
| LMArena Korean | — | 856 |

## Instruction Following

- GPT-6 Luna: 74.7 (#85)
- Phi 3 Mini 128k Instruct: 52.1 (#289)

| Benchmark | GPT-6 Luna | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Instruction Following | 1414 | 1023 |

## Long Context

- GPT-6 Luna: 43.3 (#95)
- Phi 3 Mini 128k Instruct: 30.3 (#284)

| Benchmark | GPT-6 Luna | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Longer Query | 1417 | 996 |

## Writing & Preference

- GPT-6 Luna: 58.4 (#115)
- Phi 3 Mini 128k Instruct: 27.3 (#296)

| Benchmark | GPT-6 Luna | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Text | 1392 | 1050 |
| LMArena Creative Writing | 1357 | 1024 |
| LMArena Multi-Turn | 1400 | 989 |

## FAQ

### Is GPT-6 Luna better than Phi 3 Mini 128k Instruct?

GPT-6 Luna is the stronger model overall, scoring 45.1 to 29.1 on the Noometry Index.

### Is GPT-6 Luna or Phi 3 Mini 128k Instruct better for coding?

GPT-6 Luna scores higher on coding benchmarks: 54.7 versus 28.3 in the Noometry coding category.

### How many benchmarks do GPT-6 Luna and Phi 3 Mini 128k Instruct share?

13 benchmarks have published results for both models. GPT-6 Luna has 18 scored results on Noometry and Phi 3 Mini 128k Instruct has 19.