# GPT-5.5 Pro vs Phi-3.5-mini

> GPT-5.5 Pro has enough public results to be ranked (#8); Phi-3.5-mini does not yet, so treat this comparison as directional.

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

## Summary

- Phi-3.5-mini has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Pro | Phi-3.5-mini |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 64.3 | 36.9 |
| Rank | 8 | — |
| Context | 1.05M | — |
| Input $/M | $30 | — |
| Output $/M | $180 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5 Pro: —
- Phi-3.5-mini: 34.6 (#232)

| Benchmark | GPT-5.5 Pro | Phi-3.5-mini |
|---|---|---|
| BigCodeBench Instruct | — | 32.8% |
| BigCodeBench Complete | — | 38.5% |

## Reasoning

- GPT-5.5 Pro: 73.3 (#10)
- Phi-3.5-mini: —

| Benchmark | GPT-5.5 Pro | Phi-3.5-mini |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |
| PIQA | — | 81% |

## Math

- GPT-5.5 Pro: 84.0 (#10)
- Phi-3.5-mini: —

| Benchmark | GPT-5.5 Pro | Phi-3.5-mini |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
| GSM8K | — | 86.2% |

## Knowledge

- GPT-5.5 Pro: 64.1 (#19)
- Phi-3.5-mini: —

| Benchmark | GPT-5.5 Pro | Phi-3.5-mini |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| BoolQ | — | 78% |

## FAQ

### Is GPT-5.5 Pro better than Phi-3.5-mini?

GPT-5.5 Pro has enough public results to be ranked (#8); Phi-3.5-mini does not yet, so treat this comparison as directional.

### How many benchmarks do GPT-5.5 Pro and Phi-3.5-mini share?

0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Phi-3.5-mini has 5.