# GPT-5.5 Pro vs Phi-1.5

> GPT-5.5 Pro has enough public results to be ranked (#7); Phi-1.5 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/gpt-5-5-pro-vs-phi-1-5
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both.
- Phi-1.5 has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Pro | Phi-1.5 |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 64.3 | — |
| Rank | 7 | — |
| Context | 1.05M | — |
| Input $/M | $30 | — |
| Output $/M | $180 | — |
| Weights | Proprietary | Open |

## Reasoning

- GPT-5.5 Pro: 73.6 (#7)
- Phi-1.5: —

| Benchmark | GPT-5.5 Pro | Phi-1.5 |
|---|---|---|
| Epoch Capabilities Index | 162.45 | 90.82 |
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| HellaSwag | — | 47.6% |
| WinoGrande | — | 73.4% |

## Math

- GPT-5.5 Pro: 83.8 (#8)
- Phi-1.5: —

| Benchmark | GPT-5.5 Pro | Phi-1.5 |
|---|---|---|
| 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% | — |

## Knowledge

- GPT-5.5 Pro: 64.2 (#17)
- Phi-1.5: —

| Benchmark | GPT-5.5 Pro | Phi-1.5 |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| ARC (AI2) Challenge | — | 44.4% |
| BoolQ | — | 75.8% |
| MMLU | — | 37.6% |
| OpenBookQA | — | 37.2% |

## FAQ

### Is GPT-5.5 Pro better than Phi-1.5?

GPT-5.5 Pro has enough public results to be ranked (#7); Phi-1.5 does not yet, so treat this comparison as directional.

### How many benchmarks do GPT-5.5 Pro and Phi-1.5 share?

1 benchmark has published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Phi-1.5 has 7.