# Gemini 3.1 Flash Lite vs Phi 3 Mini 128k Instruct

> Gemini 3.1 Flash Lite is the stronger model overall, scoring 40.4 to 29.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-3-1-flash-lite-vs-phi-3-mini-128k-instruct
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Gemini 3.1 Flash Lite scores higher in 8 categories and Phi 3 Mini 128k Instruct in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Gemini 3.1 Flash Lite leads 61.0 to 27.3.
- Phi 3 Mini 128k Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | Gemini 3.1 Flash Lite | Phi 3 Mini 128k Instruct |
|---|---|---|
| Provider | Google | Microsoft |
| Noometry Index | 40.4 | 29.1 |
| Rank | 141 | 303 |
| Context | 1.05M | — |
| Input $/M | $0.25 | — |
| Output $/M | $1.50 | — |
| Weights | Proprietary | Open |

## Coding

- Gemini 3.1 Flash Lite: 37.5 (#179)
- Phi 3 Mini 128k Instruct: 28.3 (#307)

| Benchmark | Gemini 3.1 Flash Lite | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Coding | 1400 | 1040 |
| LMArena WebDev | 1256 | — |
| SciCode | 41.9% | — |
| WeirdML | 52.2% | — |
| BigCodeBench Instruct | — | 29.6% |
| BigCodeBench Complete | — | 40.6% |
| ALE-Bench | 797.73 | — |

## Agentic & Tool Use

- Gemini 3.1 Flash Lite: 29.9 (#72)
- Phi 3 Mini 128k Instruct: —

| Benchmark | Gemini 3.1 Flash Lite | Phi 3 Mini 128k Instruct |
|---|---|---|
| DeepResearch Bench | 37.3% | — |

## Reasoning

- Gemini 3.1 Flash Lite: 22.3 (#181)
- Phi 3 Mini 128k Instruct: 18.7 (#254)

| Benchmark | Gemini 3.1 Flash Lite | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Hard Prompts | 1407 | 1028 |
| Kagi LLM Benchmark | 67.2% | — |
| NYT Connections (extended) | 8.2% | — |
| CritPt | 1.1% | — |
| Chess Puzzles | 25% | — |
| EnigmaEval | 3% | — |
| Thematic Generalization | 63.3% | — |
| DTBench | 76.8% | — |
| LMCA | 35% | — |
| Epoch Capabilities Index | 144.45 | — |
| ForecastBench | 54.4 | — |

## Math

- Gemini 3.1 Flash Lite: 39.5 (#82)
- Phi 3 Mini 128k Instruct: 29.2 (#220)

| Benchmark | Gemini 3.1 Flash Lite | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Math | 1427 | 1089 |
| FrontierMath (Tiers 1-3) | 27.7% | — |
| OTIS Mock AIME 2024-2025 | 80% | — |

## Knowledge

- Gemini 3.1 Flash Lite: 41.7 (#95)
- Phi 3 Mini 128k Instruct: 26.3 (#251)

| Benchmark | Gemini 3.1 Flash Lite | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Expert | 1397 | 984 |
| GPQA Diamond | 81.8% | — |
| Humanity's Last Exam | 8.6% | — |
| Vectara Hallucination Rate | 8.2% | — |

## Multimodal

- Gemini 3.1 Flash Lite: 38.7 (#57)
- Phi 3 Mini 128k Instruct: —

| Benchmark | Gemini 3.1 Flash Lite | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Vision | 1240 | — |

## Multilingual

- Gemini 3.1 Flash Lite: 52.5 (#82)
- Phi 3 Mini 128k Instruct: 25.4 (#280)

| Benchmark | Gemini 3.1 Flash Lite | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Non-English | 1410 | 1000 |
| LMArena Chinese | 1461 | 1016 |
| LMArena French | 1423 | 1038 |
| LMArena German | 1429 | 1006 |
| LMArena Japanese | 1411 | 899 |
| LMArena Korean | 1393 | 856 |
| LMArena Russian | 1420 | 1004 |
| LMArena Spanish | 1420 | 1058 |

## Instruction Following

- Gemini 3.1 Flash Lite: 72.9 (#126)
- Phi 3 Mini 128k Instruct: 52.1 (#289)

| Benchmark | Gemini 3.1 Flash Lite | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Instruction Following | 1376 | 1023 |

## Long Context

- Gemini 3.1 Flash Lite: 42.5 (#117)
- Phi 3 Mini 128k Instruct: 30.3 (#284)

| Benchmark | Gemini 3.1 Flash Lite | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Longer Query | 1394 | 996 |

## Writing & Preference

- Gemini 3.1 Flash Lite: 61.0 (#90)
- Phi 3 Mini 128k Instruct: 27.3 (#296)

| Benchmark | Gemini 3.1 Flash Lite | Phi 3 Mini 128k Instruct |
|---|---|---|
| LMArena Text | 1416 | 1050 |
| LMArena Creative Writing | 1401 | 1024 |
| LMArena Multi-Turn | 1417 | 989 |

## FAQ

### Is Gemini 3.1 Flash Lite better than Phi 3 Mini 128k Instruct?

Gemini 3.1 Flash Lite is the stronger model overall, scoring 40.4 to 29.1 on the Noometry Index.

### Is Gemini 3.1 Flash Lite or Phi 3 Mini 128k Instruct better for coding?

Gemini 3.1 Flash Lite scores higher on coding benchmarks: 37.5 versus 28.3 in the Noometry coding category.

### How many benchmarks do Gemini 3.1 Flash Lite and Phi 3 Mini 128k Instruct share?

17 benchmarks have published results for both models. Gemini 3.1 Flash Lite has 38 scored results on Noometry and Phi 3 Mini 128k Instruct has 19.