# Gemini 3.1 Flash Lite vs o4-mini

> Gemini 3.1 Flash Lite and o4-mini score almost the same on the Noometry Index (40.8 vs 41.6), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gemini-3-1-flash-lite-vs-o4-mini
- Last updated: 2026-10-10
- Shared benchmarks: 33

## Summary

- They share 33 benchmarks with published results for both. Gemini 3.1 Flash Lite scores higher in 2 categories and o4-mini in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Gemini 3.1 Flash Lite leads 60.9 to 54.0.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 8.2% for Gemini 3.1 Flash Lite and 18.6% for o4-mini.
- Gemini 3.1 Flash Lite is cheaper at $0.25 / $1.50 per million input/output tokens, against $1.10 / $4.40 for o4-mini.
- Gemini 3.1 Flash Lite accepts more context: 1.05M tokens versus 200K.

## Snapshot

| | Gemini 3.1 Flash Lite | o4-mini |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 40.8 | 41.6 |
| Rank | 144 | 132 |
| Context | 1.05M | 200K |
| Input $/M | $0.25 | $1.10 |
| Output $/M | $1.50 | $4.40 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 3.1 Flash Lite: 37.8 (#188)
- o4-mini: 40.9 (#127)

| Benchmark | Gemini 3.1 Flash Lite | o4-mini |
|---|---|---|
| WeirdML | 52.2% | 52.6% |
| LMArena Coding | 1400 | 1368 |
| ALE-Bench | 797.73 | 826.17 |
| SWE-bench Verified (bash only) | — | 45% |
| Aider Polyglot | — | 72% |
| LMArena WebDev | 1256 | — |
| SciCode | 41.9% | — |
| GSO | — | 3.6% |
| CadEval | — | 62% |
| AlgoTune | — | 1.72 |

## Agentic & Tool Use

- Gemini 3.1 Flash Lite: 30.2 (#79)
- o4-mini: 32.6 (#61)

| Benchmark | Gemini 3.1 Flash Lite | o4-mini |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 53.2% |
| GDPval | — | 25.3% |
| DeepResearch Bench | 37.3% | — |
| METR Time Horizons | — | 63.9% |

## Reasoning

- Gemini 3.1 Flash Lite: 22.9 (#186)
- o4-mini: 24.6 (#162)

| Benchmark | Gemini 3.1 Flash Lite | o4-mini |
|---|---|---|
| Kagi LLM Benchmark | 67.2% | 67.6% |
| CritPt | 1.1% | 0.6% |
| Chess Puzzles | 25% | 26% |
| EnigmaEval | 3% | 9.2% |
| LMArena Hard Prompts | 1407 | 1351 |
| DTBench | 76.8% | 77.6% |
| LMCA | 35% | 26.5% |
| Epoch Capabilities Index | 144.47 | 145.64 |
| ForecastBench | 54.4 | 61.8 |
| ARC-AGI-2 | — | 6.1% |
| SimpleBench | — | 38.7% |
| NYT Connections (extended) | 8.2% | — |
| ARC-AGI-1 | — | 58.7% |
| Thematic Generalization | 63.3% | — |
| Mystery Game Puzzles | — | 5% |

## Math

- Gemini 3.1 Flash Lite: 40.7 (#90)
- o4-mini: 40.8 (#89)

| Benchmark | Gemini 3.1 Flash Lite | o4-mini |
|---|---|---|
| FrontierMath (Tiers 1-3) | 27.7% | 36.1% |
| OTIS Mock AIME 2024-2025 | 80% | 81.7% |
| LMArena Math | 1428 | 1389 |
| FrontierMath Tier 4 | — | 4.9% |
| Omni-MATH | — | 72% |
| MATH Level 5 | — | 97.8% |
| FrontierMath (Feb 2025 set) | — | 24.8% |
| FrontierMath Tier 4 (v1) | — | 6.3% |

## Knowledge

- Gemini 3.1 Flash Lite: 41.9 (#104)
- o4-mini: 43.6 (#91)

| Benchmark | Gemini 3.1 Flash Lite | o4-mini |
|---|---|---|
| GPQA Diamond | 81.8% | 79.6% |
| Humanity's Last Exam | 8.6% | 18.1% |
| Vectara Hallucination Rate | 8.2% | 18.6% |
| LMArena Expert | 1398 | 1343 |
| SimpleQA Verified | — | 19.6% |
| MMLU-Pro | — | 82% |
| Confabulations | — | 15.8% |
| GPQA (HELM) | — | 73.5% |

## Multimodal

- Gemini 3.1 Flash Lite: 39.4 (#60)
- o4-mini: 40.2 (#49)

| Benchmark | Gemini 3.1 Flash Lite | o4-mini |
|---|---|---|
| LMArena Vision | 1240 | 1194 |
| GeoBench | — | 64% |
| VPCT | — | 57.5% |

## Multilingual

- Gemini 3.1 Flash Lite: 52.3 (#86)
- o4-mini: 47.0 (#154)

| Benchmark | Gemini 3.1 Flash Lite | o4-mini |
|---|---|---|
| LMArena Non-English | 1411 | 1337 |
| LMArena Chinese | 1461 | 1354 |
| LMArena French | 1424 | 1364 |
| LMArena German | 1429 | 1336 |
| LMArena Japanese | 1413 | 1308 |
| LMArena Korean | 1392 | 1312 |
| LMArena Russian | 1420 | 1334 |
| LMArena Spanish | 1421 | 1347 |

## Instruction Following

- Gemini 3.1 Flash Lite: 72.7 (#131)
- o4-mini: 75.2 (#68)

| Benchmark | Gemini 3.1 Flash Lite | o4-mini |
|---|---|---|
| LMArena Instruction Following | 1377 | 1321 |
| IFEval | — | 92.8% |

## Long Context

- Gemini 3.1 Flash Lite: 42.5 (#122)
- o4-mini: 45.5 (#33)

| Benchmark | Gemini 3.1 Flash Lite | o4-mini |
|---|---|---|
| LMArena Longer Query | 1394 | 1315 |
| Fiction.LiveBench | — | 77.8% |

## Writing & Preference

- Gemini 3.1 Flash Lite: 60.9 (#94)
- o4-mini: 54.0 (#152)

| Benchmark | Gemini 3.1 Flash Lite | o4-mini |
|---|---|---|
| LMArena Text | 1416 | 1353 |
| LMArena Creative Writing | 1401 | 1294 |
| LMArena Multi-Turn | 1417 | 1350 |
| Short-Story Creative Writing | — | 75% |
| WildBench | — | 85.4% |

## FAQ

### Is Gemini 3.1 Flash Lite better than o4-mini?

Gemini 3.1 Flash Lite and o4-mini score almost the same on the Noometry Index (40.8 vs 41.6), so choose on price, context window or the category you care about most.

### Which is cheaper, Gemini 3.1 Flash Lite or o4-mini?

Gemini 3.1 Flash Lite is cheaper. It lists at $0.25 per million input tokens and $1.50 per million output tokens; o4-mini lists at $1.10 and $4.40.

### Is Gemini 3.1 Flash Lite or o4-mini better for coding?

o4-mini scores higher on coding benchmarks: 40.9 versus 37.8 in the Noometry coding category.

### Which has the bigger context window?

Gemini 3.1 Flash Lite does, with 1.05M tokens against 200K.

### How many benchmarks do Gemini 3.1 Flash Lite and o4-mini share?

33 benchmarks have published results for both models. Gemini 3.1 Flash Lite has 38 scored results on Noometry and o4-mini has 60.