# gpt-oss-20b vs phi-3-medium 14B

> gpt-oss-20b is the stronger model overall, scoring 32.5 to 29.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-oss-20b-vs-phi-3-medium-14b
- Last updated: 2026-10-11
- Shared benchmarks: 2

## Summary

- They share 2 benchmarks with published results for both. gpt-oss-20b scores higher in 3 categories and phi-3-medium 14B in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where gpt-oss-20b leads 34.6 to 9.1.
- The biggest single-benchmark swing is GPQA Diamond: 60.8% for gpt-oss-20b and 27.6% for phi-3-medium 14B.

## Snapshot

| | gpt-oss-20b | phi-3-medium 14B |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 32.5 | 29.7 |
| Rank | 255 | 306 |
| Context | 131K | — |
| Input $/M | $0.018 | — |
| Output $/M | $0.09 | — |
| Weights | Open | Open |

## Coding

- gpt-oss-20b: 37.6 (#192)
- phi-3-medium 14B: 36.8 (#201)

| Benchmark | gpt-oss-20b | phi-3-medium 14B |
|---|---|---|
| SciCode | 34.4% | — |
| WeirdML | 40.9% | — |
| BigCodeBench Instruct | — | 37.6% |
| LMArena Coding | 1306 | — |
| BigCodeBench Complete | — | 48.7% |
| ALE-Bench | 566.05 | — |

## Agentic & Tool Use

- gpt-oss-20b: 9.3 (#154)
- phi-3-medium 14B: —

| Benchmark | gpt-oss-20b | phi-3-medium 14B |
|---|---|---|
| Terminal-Bench | 3.4% | — |

## Reasoning

- gpt-oss-20b: 19.3 (#261)
- phi-3-medium 14B: —

| Benchmark | gpt-oss-20b | phi-3-medium 14B |
|---|---|---|
| Epoch Capabilities Index | 137.82 | 121.23 |
| Kagi LLM Benchmark | 53.2% | — |
| CritPt | 1.4% | — |
| Chess Puzzles | 4% | — |
| LMArena Hard Prompts | 1274 | — |
| DTBench | 68% | — |
| LMCA | 14.5% | — |
| Adversarial NLI | — | 55.8% |
| BIG-Bench Hard | — | 81.4% |
| HellaSwag | — | 82.4% |
| WinoGrande | — | 81.5% |

## Math

- gpt-oss-20b: 39.4 (#103)
- phi-3-medium 14B: 27.3 (#250)

| Benchmark | gpt-oss-20b | phi-3-medium 14B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 65.3% | — |
| Omni-MATH | 56.5% | — |
| LMArena Math | 1317 | — |
| MATH Level 5 | — | 17.6% |

## Knowledge

- gpt-oss-20b: 34.6 (#195)
- phi-3-medium 14B: 9.1 (#306)

| Benchmark | gpt-oss-20b | phi-3-medium 14B |
|---|---|---|
| GPQA Diamond | 60.8% | 27.6% |
| MMLU-Pro | 74% | — |
| GPQA (HELM) | 59.4% | — |
| LMArena Expert | 1258 | — |
| ARC (AI2) Challenge | — | 91.6% |
| MMLU | — | 78% |
| OpenBookQA | — | 87.4% |
| TriviaQA | — | 73.9% |

## Multilingual

- gpt-oss-20b: 42.2 (#197)
- phi-3-medium 14B: —

| Benchmark | gpt-oss-20b | phi-3-medium 14B |
|---|---|---|
| LMArena Non-English | 1268 | — |
| LMArena Chinese | 1314 | — |
| LMArena German | 1255 | — |
| LMArena Japanese | 1244 | — |
| LMArena Korean | 1236 | — |
| LMArena Russian | 1278 | — |
| LMArena Spanish | 1267 | — |

## Instruction Following

- gpt-oss-20b: 61.8 (#240)
- phi-3-medium 14B: —

| Benchmark | gpt-oss-20b | phi-3-medium 14B |
|---|---|---|
| IFEval | 73.2% | — |
| LMArena Instruction Following | 1236 | — |

## Long Context

- gpt-oss-20b: 37.9 (#209)
- phi-3-medium 14B: —

| Benchmark | gpt-oss-20b | phi-3-medium 14B |
|---|---|---|
| LMArena Longer Query | 1250 | — |

## Writing & Preference

- gpt-oss-20b: 35.5 (#265)
- phi-3-medium 14B: —

| Benchmark | gpt-oss-20b | phi-3-medium 14B |
|---|---|---|
| LMArena Text | 1287 | — |
| LMArena Creative Writing | 1201 | — |
| EQ-Bench Creative Writing | 666 | — |
| WildBench | 73.7% | — |
| LMArena Multi-Turn | 1268 | — |

## FAQ

### Is gpt-oss-20b better than phi-3-medium 14B?

gpt-oss-20b is the stronger model overall, scoring 32.5 to 29.7 on the Noometry Index.

### Is gpt-oss-20b or phi-3-medium 14B better for coding?

They score almost the same on coding (37.6 vs 36.8); test both on your own repository before choosing.

### How many benchmarks do gpt-oss-20b and phi-3-medium 14B share?

2 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and phi-3-medium 14B has 13.