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

> GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 33.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-instant-vs-phi-3-medium-4k-instruct
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-5.5 Instant scores higher in 7 categories and Phi 3 Medium 4k Instruct in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GPT-5.5 Instant leads 61.8 to 34.1.
- Phi 3 Medium 4k Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Instant | Phi 3 Medium 4k Instruct |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 42.7 | 33.0 |
| Rank | 110 | 250 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5 Instant: 44.3 (#74)
- Phi 3 Medium 4k Instruct: 32.9 (#268)

| Benchmark | GPT-5.5 Instant | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Coding | 1433 | 1130 |
| SciCode | 48.6% | — |

## Reasoning

- GPT-5.5 Instant: 24.9 (#155)
- Phi 3 Medium 4k Instruct: 21.7 (#214)

| Benchmark | GPT-5.5 Instant | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Hard Prompts | 1426 | 1127 |
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| Epoch Capabilities Index | 142.52 | — |

## Math

- GPT-5.5 Instant: 26.5 (#259)
- Phi 3 Medium 4k Instruct: 33.4 (#202)

| Benchmark | GPT-5.5 Instant | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Math | 1420 | 1173 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |

## Knowledge

- GPT-5.5 Instant: 48.9 (#74)
- Phi 3 Medium 4k Instruct: 30.2 (#229)

| Benchmark | GPT-5.5 Instant | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Expert | 1409 | 1108 |
| GPQA Diamond | 82.5% | — |

## Multimodal

- GPT-5.5 Instant: 40.0 (#52)
- Phi 3 Medium 4k Instruct: —

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

## Multilingual

- GPT-5.5 Instant: 52.8 (#80)
- Phi 3 Medium 4k Instruct: 30.6 (#263)

| Benchmark | GPT-5.5 Instant | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Non-English | 1417 | 1094 |
| LMArena Chinese | 1456 | 1108 |
| LMArena French | 1428 | 1110 |
| LMArena German | 1411 | 1101 |
| LMArena Japanese | 1408 | 1042 |
| LMArena Korean | 1392 | 954 |
| LMArena Russian | 1431 | 1145 |
| LMArena Spanish | 1429 | 1095 |

## Instruction Following

- GPT-5.5 Instant: 74.2 (#100)
- Phi 3 Medium 4k Instruct: 57.6 (#268)

| Benchmark | GPT-5.5 Instant | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Instruction Following | 1406 | 1113 |

## Long Context

- GPT-5.5 Instant: 43.4 (#96)
- Phi 3 Medium 4k Instruct: 34.0 (#255)

| Benchmark | GPT-5.5 Instant | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Longer Query | 1422 | 1120 |

## Writing & Preference

- GPT-5.5 Instant: 61.8 (#85)
- Phi 3 Medium 4k Instruct: 34.1 (#272)

| Benchmark | GPT-5.5 Instant | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Text | 1419 | 1138 |
| LMArena Creative Writing | 1419 | 1107 |
| LMArena Multi-Turn | 1433 | 1088 |

## FAQ

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

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 33.0 on the Noometry Index.

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

GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 32.9 in the Noometry coding category.

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

17 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Phi 3 Medium 4k Instruct has 17.