# GPT-5.5 Pro vs Phi 3 Small 8k Instruct

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 29.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-pro-vs-phi-3-small-8k-instruct
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 14.8.
- Phi 3 Small 8k Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Pro | Phi 3 Small 8k Instruct |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 64.3 | 29.3 |
| Rank | 8 | 314 |
| Context | 1.05M | — |
| Input $/M | $30 | — |
| Output $/M | $180 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5 Pro: —
- Phi 3 Small 8k Instruct: 27.9 (#318)

| Benchmark | GPT-5.5 Pro | Phi 3 Small 8k Instruct |
|---|---|---|
| LiveBench Coding | — | 20.3% |
| LMArena Coding | — | 1101 |

## Reasoning

- GPT-5.5 Pro: 73.3 (#10)
- Phi 3 Small 8k Instruct: 14.8 (#323)

| Benchmark | GPT-5.5 Pro | Phi 3 Small 8k Instruct |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| LiveBench Reasoning | — | 15.9% |
| LMArena Hard Prompts | — | 1100 |
| DTBench | 96% | — |
| LiveBench Data Analysis | — | 30.3% |
| LMCA | 53.9% | — |
| Adversarial NLI | — | 58.1% |
| BIG-Bench Hard | — | 79.1% |
| Epoch Capabilities Index | 162.07 | — |
| HellaSwag | — | 77% |
| LiveBench | — | 24% |
| WinoGrande | — | 81.5% |

## Math

- GPT-5.5 Pro: 84.0 (#10)
- Phi 3 Small 8k Instruct: 27.6 (#248)

| Benchmark | GPT-5.5 Pro | Phi 3 Small 8k Instruct |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| LiveBench Math | — | 17.6% |
| LMArena Math | — | 1151 |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |

## Knowledge

- GPT-5.5 Pro: 64.1 (#19)
- Phi 3 Small 8k Instruct: 29.1 (#240)

| Benchmark | GPT-5.5 Pro | Phi 3 Small 8k Instruct |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| LMArena Expert | — | 1067 |
| ARC (AI2) Challenge | — | 90.7% |
| MMLU | — | 75.7% |
| OpenBookQA | — | 88% |
| TriviaQA | — | 58.1% |

## Multilingual

- GPT-5.5 Pro: —
- Phi 3 Small 8k Instruct: 28.5 (#272)

| Benchmark | GPT-5.5 Pro | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Non-English | — | 1058 |
| LMArena Chinese | — | 1061 |
| LMArena French | — | 1135 |
| LMArena German | — | 1080 |
| LMArena Japanese | — | 966 |
| LMArena Korean | — | 894 |
| LMArena Russian | — | 1111 |
| LMArena Spanish | — | 1111 |

## Instruction Following

- GPT-5.5 Pro: —
- Phi 3 Small 8k Instruct: 51.9 (#292)

| Benchmark | GPT-5.5 Pro | Phi 3 Small 8k Instruct |
|---|---|---|
| LiveBench Instruction Following | — | 47.2% |
| LMArena Instruction Following | — | 1087 |

## Long Context

- GPT-5.5 Pro: —
- Phi 3 Small 8k Instruct: 33.0 (#267)

| Benchmark | GPT-5.5 Pro | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Longer Query | — | 1088 |

## Writing & Preference

- GPT-5.5 Pro: —
- Phi 3 Small 8k Instruct: 31.1 (#284)

| Benchmark | GPT-5.5 Pro | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Text | — | 1110 |
| LMArena Creative Writing | — | 1083 |
| LMArena Multi-Turn | — | 1068 |
| LiveBench Language | — | 12.9% |

## FAQ

### Is GPT-5.5 Pro better than Phi 3 Small 8k Instruct?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 29.3 on the Noometry Index.

### How many benchmarks do GPT-5.5 Pro and Phi 3 Small 8k Instruct share?

0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Phi 3 Small 8k Instruct has 32.