# GPT-5.5 Instant vs Phi 3 Mini 4k Instruct

> GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 27.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-instant-vs-phi-3-mini-4k-instruct
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. GPT-5.5 Instant scores higher in 8 categories and Phi 3 Mini 4k Instruct in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GPT-5.5 Instant leads 62.0 to 27.7.
- The biggest single-benchmark swing is Chess Puzzles: 12% for GPT-5.5 Instant and 0% for Phi 3 Mini 4k Instruct.
- Phi 3 Mini 4k Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Instant | Phi 3 Mini 4k Instruct |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 42.5 | 27.4 |
| Rank | 99 | 324 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5 Instant: 43.7 (#73)
- Phi 3 Mini 4k Instruct: 26.1 (#319)

| Benchmark | GPT-5.5 Instant | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Coding | 1433 | 1093 |
| SciCode | 48.6% | — |
| LiveBench Coding | — | 15.5% |
| HumanEval+ | — | 59.1% |
| MBPP+ | — | 54.2% |

## Reasoning

- GPT-5.5 Instant: 24.2 (#149)
- Phi 3 Mini 4k Instruct: 13.6 (#326)

| Benchmark | GPT-5.5 Instant | Phi 3 Mini 4k Instruct |
|---|---|---|
| Chess Puzzles | 12% | 0% |
| LMArena Hard Prompts | 1426 | 1072 |
| CritPt | 0% | — |
| LiveBench Reasoning | — | 26.8% |
| LiveBench Data Analysis | — | 34.7% |
| Adversarial NLI | — | 52.8% |
| BIG-Bench Hard | — | 71.7% |
| Epoch Capabilities Index | 142.48 | — |
| HellaSwag | — | 76.7% |
| LiveBench | — | 22.4% |
| WinoGrande | — | 70.8% |

## Math

- GPT-5.5 Instant: 26.1 (#241)
- Phi 3 Mini 4k Instruct: 24.5 (#258)

| Benchmark | GPT-5.5 Instant | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Math | 1420 | 1111 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
| LiveBench Math | — | 15.7% |

## Knowledge

- GPT-5.5 Instant: 48.9 (#68)
- Phi 3 Mini 4k Instruct: 27.9 (#241)

| Benchmark | GPT-5.5 Instant | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Expert | 1409 | 1045 |
| GPQA Diamond | 82.5% | — |
| ARC (AI2) Challenge | — | 84.9% |
| MMLU | — | 68.8% |
| OpenBookQA | — | 88% |
| TriviaQA | — | 64% |

## Multimodal

- GPT-5.5 Instant: 39.3 (#48)
- Phi 3 Mini 4k Instruct: —

| Benchmark | GPT-5.5 Instant | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |

## Multilingual

- GPT-5.5 Instant: 53.0 (#76)
- Phi 3 Mini 4k Instruct: 26.5 (#275)

| Benchmark | GPT-5.5 Instant | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Non-English | 1417 | 1021 |
| LMArena Chinese | 1457 | 1021 |
| LMArena French | 1428 | 1075 |
| LMArena German | 1410 | 1044 |
| LMArena Japanese | 1408 | 935 |
| LMArena Korean | 1393 | 905 |
| LMArena Russian | 1430 | 1022 |
| LMArena Spanish | 1430 | 1084 |

## Instruction Following

- GPT-5.5 Instant: 74.4 (#94)
- Phi 3 Mini 4k Instruct: 48.0 (#298)

| Benchmark | GPT-5.5 Instant | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Instruction Following | 1407 | 1053 |
| LiveBench Instruction Following | — | 39.1% |

## Long Context

- GPT-5.5 Instant: 43.4 (#92)
- Phi 3 Mini 4k Instruct: 31.7 (#271)

| Benchmark | GPT-5.5 Instant | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Longer Query | 1422 | 1044 |

## Writing & Preference

- GPT-5.5 Instant: 62.0 (#81)
- Phi 3 Mini 4k Instruct: 27.7 (#295)

| Benchmark | GPT-5.5 Instant | Phi 3 Mini 4k Instruct |
|---|---|---|
| LMArena Text | 1419 | 1073 |
| LMArena Creative Writing | 1420 | 1037 |
| LMArena Multi-Turn | 1434 | 1018 |
| LiveBench Language | — | 9.2% |

## FAQ

### Is GPT-5.5 Instant better than Phi 3 Mini 4k Instruct?

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 27.4 on the Noometry Index.

### Is GPT-5.5 Instant or Phi 3 Mini 4k Instruct better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 26.1 in the Noometry coding category.

### How many benchmarks do GPT-5.5 Instant and Phi 3 Mini 4k Instruct share?

18 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Phi 3 Mini 4k Instruct has 35.