# o3 vs Phi 3 Small 8k Instruct

> o3 is the stronger model overall, scoring 47.4 to 28.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/o3-vs-phi-3-small-8k-instruct
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. o3 scores higher in 8 categories and Phi 3 Small 8k Instruct in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where o3 leads 63.7 to 31.3.
- Phi 3 Small 8k Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | o3 | Phi 3 Small 8k Instruct |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 47.4 | 28.8 |
| Rank | 53 | 310 |
| Context | 200K | — |
| Input $/M | $2 | — |
| Output $/M | $8 | — |
| Weights | Proprietary | Open |

## Coding

- o3: 47.3 (#57)
- Phi 3 Small 8k Instruct: 27.4 (#313)

| Benchmark | o3 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Coding | 1408 | 1102 |
| SWE-bench Verified | 62.3% | — |
| SWE-bench Verified (bash only) | 58.4% | — |
| Aider Polyglot | 81.3% | — |
| GSO | 8.8% | — |
| WeirdML | 52.4% | — |
| LiveBench Coding | — | 20.3% |
| CadEval | 74% | — |
| ALE-Bench | 933.55 | — |

## Agentic & Tool Use

- o3: 34.3 (#42)
- Phi 3 Small 8k Instruct: —

| Benchmark | o3 | Phi 3 Small 8k Instruct |
|---|---|---|
| Berkeley Function Calling Leaderboard | 63% | — |
| GDPval | 30.8% | — |
| DeepResearch Bench | 45.2% | — |
| OSWorld | 23% | — |
| LMArena Search | 1144 | — |
| METR Time Horizons | 65.4% | — |

## Reasoning

- o3: 32.1 (#66)
- Phi 3 Small 8k Instruct: 14.2 (#319)

| Benchmark | o3 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Hard Prompts | 1402 | 1100 |
| ARC-AGI-2 | 6.5% | — |
| SimpleBench | 53.1% | — |
| Kagi LLM Benchmark | 67.6% | — |
| ARC-AGI-1 | 60.8% | — |
| CritPt | 1.4% | — |
| Chess Puzzles | 38% | — |
| EnigmaEval | 13.1% | — |
| LiveBench Reasoning | — | 15.9% |
| Mystery Game Puzzles | 29% | — |
| DTBench | 84.8% | — |
| LiveBench Data Analysis | — | 30.3% |
| LMCA | 39.7% | — |
| Adversarial NLI | — | 58.1% |
| BIG-Bench Hard | — | 79.1% |
| Epoch Capabilities Index | 146.88 | — |
| ForecastBench | 62.5 | — |
| HellaSwag | — | 77% |
| LiveBench | — | 24% |
| WinoGrande | — | 81.5% |

## Math

- o3: 48.9 (#49)
- Phi 3 Small 8k Instruct: 25.4 (#247)

| Benchmark | o3 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Math | 1426 | 1151 |
| FrontierMath (Tiers 1-3) | 33.3% | — |
| OTIS Mock AIME 2024-2025 | 84.4% | — |
| Omni-MATH | 71.4% | — |
| LiveBench Math | — | 17.6% |
| MATH Level 5 | 97.8% | — |
| FrontierMath (Feb 2025 set) | 18.7% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |

## Knowledge

- o3: 54.5 (#47)
- Phi 3 Small 8k Instruct: 28.5 (#237)

| Benchmark | o3 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Expert | 1403 | 1067 |
| GPQA Diamond | 81.8% | — |
| Humanity's Last Exam | 20.3% | — |
| SimpleQA Verified | 49.4% | — |
| MMLU-Pro | 85.9% | — |
| Confabulations | 14.4% | — |
| GPQA (HELM) | 75.3% | — |
| ARC (AI2) Challenge | — | 90.7% |
| MMLU | — | 75.7% |
| OpenBookQA | — | 88% |
| TriviaQA | — | 58.1% |

## Multimodal

- o3: 40.7 (#35)
- Phi 3 Small 8k Instruct: —

| Benchmark | o3 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Vision | 1214 | — |
| GeoBench | 74% | — |
| VPCT | 52% | — |

## Multilingual

- o3: 51.9 (#99)
- Phi 3 Small 8k Instruct: 28.6 (#267)

| Benchmark | o3 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Non-English | 1402 | 1058 |
| LMArena Chinese | 1438 | 1061 |
| LMArena French | 1430 | 1134 |
| LMArena German | 1420 | 1080 |
| LMArena Japanese | 1404 | 966 |
| LMArena Korean | 1371 | 894 |
| LMArena Russian | 1407 | 1111 |
| LMArena Spanish | 1395 | 1111 |

## Instruction Following

- o3: 73.0 (#122)
- Phi 3 Small 8k Instruct: 52.2 (#287)

| Benchmark | o3 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Instruction Following | 1368 | 1087 |
| LiveBench Instruction Following | — | 47.2% |
| IFEval | 86.9% | — |

## Long Context

- o3: 53.2 (#6)
- Phi 3 Small 8k Instruct: 33.0 (#262)

| Benchmark | o3 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Longer Query | 1372 | 1088 |
| Fiction.LiveBench | 88.9% | — |
| CL-bench | 17.8% | — |

## Writing & Preference

- o3: 63.7 (#62)
- Phi 3 Small 8k Instruct: 31.3 (#279)

| Benchmark | o3 | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Text | 1410 | 1110 |
| LMArena Creative Writing | 1359 | 1083 |
| LMArena Multi-Turn | 1405 | 1068 |
| Short-Story Creative Writing | 83.9% | — |
| EQ-Bench Creative Writing | 1676 | — |
| WildBench | 86.1% | — |
| LiveBench Language | — | 12.9% |

## FAQ

### Is o3 better than Phi 3 Small 8k Instruct?

o3 is the stronger model overall, scoring 47.4 to 28.8 on the Noometry Index.

### Is o3 or Phi 3 Small 8k Instruct better for coding?

o3 scores higher on coding benchmarks: 47.3 versus 27.4 in the Noometry coding category.

### How many benchmarks do o3 and Phi 3 Small 8k Instruct share?

17 benchmarks have published results for both models. o3 has 63 scored results on Noometry and Phi 3 Small 8k Instruct has 32.