# GPT-4.1 nano vs Phi-1.5

> GPT-4.1 nano has enough public results to be ranked (#322); Phi-1.5 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/gpt-4-1-nano-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-4.1 nano | Phi-1.5 |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 27.7 | — |
| Rank | 322 | — |
| Context | 1.05M | — |
| Input $/M | $0.10 | — |
| Output $/M | $0.40 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-4.1 nano: 23.8 (#325)
- Phi-1.5: —

| Benchmark | GPT-4.1 nano | Phi-1.5 |
|---|---|---|
| Aider Polyglot | 8.9% | — |
| SciCode | 25.9% | — |
| WeirdML | 19% | — |
| LMArena Coding | 1306 | — |

## Agentic & Tool Use

- GPT-4.1 nano: 26.3 (#98)
- Phi-1.5: —

| Benchmark | GPT-4.1 nano | Phi-1.5 |
|---|---|---|
| Berkeley Function Calling Leaderboard | 33% | — |

## Reasoning

- GPT-4.1 nano: 8.6 (#344)
- Phi-1.5: —

| Benchmark | GPT-4.1 nano | Phi-1.5 |
|---|---|---|
| Epoch Capabilities Index | 129.62 | 90.82 |
| ARC-AGI-2 | 0% | — |
| Kagi LLM Benchmark | 33.3% | — |
| ARC-AGI-1 | 0% | — |
| CritPt | 0% | — |
| LMArena Hard Prompts | 1286 | — |
| DTBench | 52.5% | — |
| LMCA | 5.5% | — |
| HellaSwag | — | 47.6% |
| WinoGrande | — | 73.4% |

## Math

- GPT-4.1 nano: 25.5 (#246)
- Phi-1.5: —

| Benchmark | GPT-4.1 nano | Phi-1.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 28.9% | — |
| Omni-MATH | 36.7% | — |
| LMArena Math | 1274 | — |
| MATH Level 5 | 70% | — |
| FrontierMath (Feb 2025 set) | 1% | — |

## Knowledge

- GPT-4.1 nano: 21.8 (#268)
- Phi-1.5: —

| Benchmark | GPT-4.1 nano | Phi-1.5 |
|---|---|---|
| GPQA Diamond | 48.9% | — |
| SimpleQA Verified | 6% | — |
| MMLU-Pro | 55% | — |
| GPQA (HELM) | 50.7% | — |
| LMArena Expert | 1272 | — |
| ARC (AI2) Challenge | — | 44.4% |
| BoolQ | — | 75.8% |
| MMLU | — | 37.6% |
| OpenBookQA | — | 37.2% |

## Multimodal

- GPT-4.1 nano: 28.6 (#108)
- Phi-1.5: —

| Benchmark | GPT-4.1 nano | Phi-1.5 |
|---|---|---|
| LMArena Vision | 1063 | — |

## Multilingual

- GPT-4.1 nano: 41.8 (#200)
- Phi-1.5: —

| Benchmark | GPT-4.1 nano | Phi-1.5 |
|---|---|---|
| LMArena Non-English | 1260 | — |
| LMArena Chinese | 1270 | — |
| LMArena German | 1288 | — |
| LMArena Japanese | 1199 | — |
| LMArena Russian | 1261 | — |

## Instruction Following

- GPT-4.1 nano: 68.0 (#188)
- Phi-1.5: —

| Benchmark | GPT-4.1 nano | Phi-1.5 |
|---|---|---|
| IFEval | 84.3% | — |
| LMArena Instruction Following | 1267 | — |

## Long Context

- GPT-4.1 nano: 23.7 (#291)
- Phi-1.5: —

| Benchmark | GPT-4.1 nano | Phi-1.5 |
|---|---|---|
| Fiction.LiveBench | 25% | — |
| LMArena Longer Query | 1283 | — |

## Writing & Preference

- GPT-4.1 nano: 40.7 (#238)
- Phi-1.5: —

| Benchmark | GPT-4.1 nano | Phi-1.5 |
|---|---|---|
| LMArena Text | 1285 | — |
| LMArena Creative Writing | 1260 | — |
| EQ-Bench Creative Writing | 946 | — |
| WildBench | 81.2% | — |
| LMArena Multi-Turn | 1277 | — |

## FAQ

### Is GPT-4.1 nano better than Phi-1.5?

GPT-4.1 nano has enough public results to be ranked (#322); Phi-1.5 does not yet, so treat this comparison as directional.

### How many benchmarks do GPT-4.1 nano and Phi-1.5 share?

1 benchmark has published results for both models. GPT-4.1 nano has 38 scored results on Noometry and Phi-1.5 has 7.