# Gemini 1.5 Flash (May 2024) vs Gemini 3.1 Flash Lite

> Gemini 3.1 Flash Lite is the stronger model overall, scoring 40.8 to 33.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-1-5-flash-vs-gemini-3-1-flash-lite
- Last updated: 2026-10-12
- Shared benchmarks: 24

## Summary

- They share 24 benchmarks with published results for both. Gemini 1.5 Flash (May 2024) scores higher in 0 categories and Gemini 3.1 Flash Lite in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Gemini 3.1 Flash Lite leads 40.7 to 22.1.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 16.3% for Gemini 1.5 Flash (May 2024) and 80% for Gemini 3.1 Flash Lite.

## Snapshot

| | Gemini 1.5 Flash (May 2024) | Gemini 3.1 Flash Lite |
|---|---|---|
| Provider | Google | Google |
| Noometry Index | 33.2 | 40.8 |
| Rank | 246 | 144 |
| Context | — | 1.05M |
| Input $/M | — | $0.25 |
| Output $/M | — | $1.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 1.5 Flash (May 2024): 34.4 (#236)
- Gemini 3.1 Flash Lite: 37.8 (#188)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.1 Flash Lite |
|---|---|---|
| WeirdML | 24.9% | 52.2% |
| LMArena Coding | 1261 | 1400 |
| LMArena WebDev | — | 1256 |
| SciCode | — | 41.9% |
| BigCodeBench Instruct | 43.5% | — |
| BigCodeBench Complete | 55.1% | — |
| ALE-Bench | — | 797.73 |
| HumanEval+ | 75.6% | — |
| MBPP+ | 67.5% | — |

## Agentic & Tool Use

- Gemini 1.5 Flash (May 2024): 26.6 (#102)
- Gemini 3.1 Flash Lite: 30.2 (#79)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.1 Flash Lite |
|---|---|---|
| DeepResearch Bench | — | 37.3% |
| BALROG | 14.6% | — |

## Reasoning

- Gemini 1.5 Flash (May 2024): 21.7 (#215)
- Gemini 3.1 Flash Lite: 22.9 (#186)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.1 Flash Lite |
|---|---|---|
| LMArena Hard Prompts | 1257 | 1407 |
| DTBench | 53.8% | 76.8% |
| Epoch Capabilities Index | 129.36 | 144.47 |
| ForecastBench | 53.9 | 54.4 |
| Kagi LLM Benchmark | — | 67.2% |
| NYT Connections (extended) | — | 8.2% |
| CritPt | — | 1.1% |
| Chess Puzzles | — | 25% |
| EnigmaEval | — | 3% |
| Thematic Generalization | — | 63.3% |
| LMCA | — | 35% |
| PIQA | 87.5% | — |

## Math

- Gemini 1.5 Flash (May 2024): 22.1 (#281)
- Gemini 3.1 Flash Lite: 40.7 (#90)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.1 Flash Lite |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 16.3% | 80% |
| LMArena Math | 1269 | 1428 |
| FrontierMath (Tiers 1-3) | — | 27.7% |
| Omni-MATH | 30.4% | — |
| MATH Level 5 | 61.9% | — |
| FrontierMath (Feb 2025 set) | 0% | — |
| GSM8K | 82.4% | — |

## Knowledge

- Gemini 1.5 Flash (May 2024): 26.2 (#260)
- Gemini 3.1 Flash Lite: 41.9 (#104)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.1 Flash Lite |
|---|---|---|
| GPQA Diamond | 47.3% | 81.8% |
| LMArena Expert | 1233 | 1398 |
| Humanity's Last Exam | — | 8.6% |
| MMLU-Pro | 67.8% | — |
| Vectara Hallucination Rate | — | 8.2% |
| GPQA (HELM) | 43.7% | — |
| BoolQ | 85.8% | — |
| MMLU | 77.9% | — |

## Multimodal

- Gemini 1.5 Flash (May 2024): 36.0 (#81)
- Gemini 3.1 Flash Lite: 39.4 (#60)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.1 Flash Lite |
|---|---|---|
| LMArena Vision | 1141 | 1240 |
| Video-MME | 70.3% | — |
| GeoBench | 76% | — |

## Multilingual

- Gemini 1.5 Flash (May 2024): 42.9 (#189)
- Gemini 3.1 Flash Lite: 52.3 (#86)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.1 Flash Lite |
|---|---|---|
| LMArena Non-English | 1278 | 1411 |
| LMArena Chinese | 1295 | 1461 |
| LMArena French | 1258 | 1424 |
| LMArena German | 1262 | 1429 |
| LMArena Japanese | 1252 | 1413 |
| LMArena Korean | 1221 | 1392 |
| LMArena Russian | 1288 | 1420 |
| LMArena Spanish | 1243 | 1421 |

## Instruction Following

- Gemini 1.5 Flash (May 2024): 66.8 (#205)
- Gemini 3.1 Flash Lite: 72.7 (#131)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.1 Flash Lite |
|---|---|---|
| LMArena Instruction Following | 1258 | 1377 |
| IFEval | 83.1% | — |

## Long Context

- Gemini 1.5 Flash (May 2024): 39.0 (#187)
- Gemini 3.1 Flash Lite: 42.5 (#122)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.1 Flash Lite |
|---|---|---|
| LMArena Longer Query | 1284 | 1394 |

## Writing & Preference

- Gemini 1.5 Flash (May 2024): 48.7 (#196)
- Gemini 3.1 Flash Lite: 60.9 (#94)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.1 Flash Lite |
|---|---|---|
| LMArena Text | 1287 | 1416 |
| LMArena Creative Writing | 1285 | 1401 |
| LMArena Multi-Turn | 1253 | 1417 |
| WildBench | 79.2% | — |

## FAQ

### Is Gemini 1.5 Flash (May 2024) better than Gemini 3.1 Flash Lite?

Gemini 3.1 Flash Lite is the stronger model overall, scoring 40.8 to 33.2 on the Noometry Index.

### Is Gemini 1.5 Flash (May 2024) or Gemini 3.1 Flash Lite better for coding?

Gemini 3.1 Flash Lite scores higher on coding benchmarks: 37.8 versus 34.4 in the Noometry coding category.

### How many benchmarks do Gemini 1.5 Flash (May 2024) and Gemini 3.1 Flash Lite share?

24 benchmarks have published results for both models. Gemini 1.5 Flash (May 2024) has 42 scored results on Noometry and Gemini 3.1 Flash Lite has 38.