# Gemini 1.5 Flash (May 2024) vs Gemini 2.5 Flash-Lite

> Gemini 2.5 Flash-Lite is the stronger model overall, scoring 36.4 to 32.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-1-5-flash-vs-gemini-2-5-flash-lite
- Last updated: 2026-10-10
- Shared benchmarks: 26

## Summary

- They share 26 benchmarks with published results for both. Gemini 1.5 Flash (May 2024) scores higher in 2 categories and Gemini 2.5 Flash-Lite in 8 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Gemini 2.5 Flash-Lite leads 35.5 to 20.8.
- The biggest single-benchmark swing is Omni-MATH: 30.4% for Gemini 1.5 Flash (May 2024) and 48% for Gemini 2.5 Flash-Lite.

## Snapshot

| | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash-Lite |
|---|---|---|
| Provider | Google | Google |
| Noometry Index | 32.9 | 36.4 |
| Rank | 240 | 208 |
| Context | — | 1.05M |
| Input $/M | — | $0.10 |
| Output $/M | — | $0.40 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 1.5 Flash (May 2024): 33.9 (#233)
- Gemini 2.5 Flash-Lite: 38.0 (#167)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash-Lite |
|---|---|---|
| WeirdML | 24.9% | 35.2% |
| LMArena Coding | 1262 | 1373 |
| BigCodeBench Instruct | 43.5% | — |
| BigCodeBench Complete | 55.1% | — |
| ALE-Bench | — | 325.9 |
| HumanEval+ | 75.6% | — |
| MBPP+ | 67.5% | — |

## Agentic & Tool Use

- Gemini 1.5 Flash (May 2024): 26.3 (#97)
- Gemini 2.5 Flash-Lite: 27.8 (#89)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash-Lite |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 36.9% |
| BALROG | 14.6% | — |

## Reasoning

- Gemini 1.5 Flash (May 2024): 20.8 (#212)
- Gemini 2.5 Flash-Lite: 21.5 (#196)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash-Lite |
|---|---|---|
| LMArena Hard Prompts | 1257 | 1377 |
| DTBench | 53.8% | 62.8% |
| Epoch Capabilities Index | 129.37 | 133.93 |
| Kagi LLM Benchmark | — | 40.5% |
| LMCA | — | 18.1% |
| ForecastBench | 53.9 | — |
| PIQA | 87.5% | — |

## Math

- Gemini 1.5 Flash (May 2024): 20.8 (#274)
- Gemini 2.5 Flash-Lite: 35.5 (#144)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash-Lite |
|---|---|---|
| Omni-MATH | 30.4% | 48% |
| LMArena Math | 1269 | 1373 |
| OTIS Mock AIME 2024-2025 | 16.3% | — |
| MATH Level 5 | 61.9% | — |
| FrontierMath (Feb 2025 set) | 0% | — |
| GSM8K | 82.4% | — |

## Knowledge

- Gemini 1.5 Flash (May 2024): 26.2 (#253)
- Gemini 2.5 Flash-Lite: 32.1 (#206)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash-Lite |
|---|---|---|
| MMLU-Pro | 67.8% | 53.7% |
| GPQA (HELM) | 43.7% | 30.9% |
| LMArena Expert | 1233 | 1373 |
| GPQA Diamond | 47.3% | — |
| Vectara Hallucination Rate | — | 3.3% |
| BoolQ | 85.8% | — |
| MMLU | 77.9% | — |

## Multimodal

- Gemini 1.5 Flash (May 2024): 35.3 (#76)
- Gemini 2.5 Flash-Lite: 28.6 (#109)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash-Lite |
|---|---|---|
| LMArena Vision | 1141 | 1198 |
| Video-MME | 70.3% | — |
| GeoBench | 76% | — |
| VPCT | — | 30% |

## Multilingual

- Gemini 1.5 Flash (May 2024): 43.1 (#184)
- Gemini 2.5 Flash-Lite: 49.5 (#129)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash-Lite |
|---|---|---|
| LMArena Non-English | 1278 | 1369 |
| LMArena Chinese | 1295 | 1404 |
| LMArena French | 1257 | 1388 |
| LMArena German | 1262 | 1390 |
| LMArena Japanese | 1252 | 1359 |
| LMArena Korean | 1220 | 1358 |
| LMArena Russian | 1288 | 1373 |
| LMArena Spanish | 1242 | 1396 |

## Instruction Following

- Gemini 1.5 Flash (May 2024): 67.0 (#199)
- Gemini 2.5 Flash-Lite: 70.2 (#163)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash-Lite |
|---|---|---|
| IFEval | 83.1% | 81% |
| LMArena Instruction Following | 1258 | 1366 |

## Long Context

- Gemini 1.5 Flash (May 2024): 39.0 (#182)
- Gemini 2.5 Flash-Lite: 33.3 (#257)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash-Lite |
|---|---|---|
| LMArena Longer Query | 1284 | 1373 |
| Fiction.LiveBench | — | 47.2% |

## Writing & Preference

- Gemini 1.5 Flash (May 2024): 48.9 (#190)
- Gemini 2.5 Flash-Lite: 57.0 (#130)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash-Lite |
|---|---|---|
| LMArena Text | 1287 | 1379 |
| LMArena Creative Writing | 1285 | 1366 |
| WildBench | 79.2% | 81.8% |
| LMArena Multi-Turn | 1253 | 1367 |

## FAQ

### Is Gemini 1.5 Flash (May 2024) better than Gemini 2.5 Flash-Lite?

Gemini 2.5 Flash-Lite is the stronger model overall, scoring 36.4 to 32.9 on the Noometry Index.

### Is Gemini 1.5 Flash (May 2024) or Gemini 2.5 Flash-Lite better for coding?

Gemini 2.5 Flash-Lite scores higher on coding benchmarks: 38.0 versus 33.9 in the Noometry coding category.

### How many benchmarks do Gemini 1.5 Flash (May 2024) and Gemini 2.5 Flash-Lite share?

26 benchmarks have published results for both models. Gemini 1.5 Flash (May 2024) has 42 scored results on Noometry and Gemini 2.5 Flash-Lite has 33.