# Gemini 1.5 Flash (May 2024) vs Gemini 3.5 Flash

> Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 33.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-1-5-flash-vs-gemini-3-5-flash
- Last updated: 2026-10-10
- Shared benchmarks: 25

## Summary

- They share 25 benchmarks with published results for both. Gemini 1.5 Flash (May 2024) scores higher in 1 category and Gemini 3.5 Flash in 9 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.5 Flash leads 62.8 to 21.7.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 16.3% for Gemini 1.5 Flash (May 2024) and 95.6% for Gemini 3.5 Flash.

## Snapshot

| | Gemini 1.5 Flash (May 2024) | Gemini 3.5 Flash |
|---|---|---|
| Provider | Google | Google |
| Noometry Index | 33.2 | 54.2 |
| Rank | 246 | 32 |
| Context | — | 1.05M |
| Input $/M | — | $1.50 |
| Output $/M | — | $9 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 1.5 Flash (May 2024): 34.4 (#236)
- Gemini 3.5 Flash: 49.4 (#49)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.5 Flash |
|---|---|---|
| WeirdML | 24.9% | 62.6% |
| LMArena Coding | 1261 | 1492 |
| SWE-bench Verified | — | 79.3% |
| DeepSWE | — | 37.4% |
| LMArena WebDev | — | 1499 |
| SciCode | — | 53.1% |
| BigCodeBench Instruct | 43.5% | — |
| BigCodeBench Complete | 55.1% | — |
| ALE-Bench | — | 911.02 |
| HumanEval+ | 75.6% | — |
| MBPP+ | 67.5% | — |

## Agentic & Tool Use

- Gemini 1.5 Flash (May 2024): 26.6 (#102)
- Gemini 3.5 Flash: 24.7 (#114)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.5 Flash |
|---|---|---|
| APEX-Agents | — | 27.5% |
| BALROG | 14.6% | — |
| GBAEval | — | 6.7% |
| GDP.pdf | — | 14% |
| Vending-Bench 2 | — | 5,396 |

## Reasoning

- Gemini 1.5 Flash (May 2024): 21.7 (#215)
- Gemini 3.5 Flash: 62.8 (#18)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1257 | 1488 |
| DTBench | 53.8% | 94.7% |
| Epoch Capabilities Index | 129.36 | 154.46 |
| ForecastBench | 53.9 | 59 |
| ARC-AGI-2 | — | 72.1% |
| SimpleBench | — | 76.7% |
| NYT Connections (extended) | — | 92.6% |
| ARC-AGI-1 | — | 92.5% |
| CritPt | — | 13.1% |
| Chess Puzzles | — | 50% |
| EnigmaEval | — | 25.4% |
| EBR-Bench | — | 4.8% |
| Mystery Game Puzzles | — | 32% |
| LMCA | — | 47.1% |
| Surface Evolver Bench | — | 58.1% |
| PIQA | 87.5% | — |

## Math

- Gemini 1.5 Flash (May 2024): 22.1 (#281)
- Gemini 3.5 Flash: 60.7 (#36)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.5 Flash |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 16.3% | 95.6% |
| LMArena Math | 1269 | 1504 |
| FrontierMath (Feb 2025 set) | 0% | 39% |
| FrontierMath (Tiers 1-3) | — | 62.8% |
| FrontierMath Tier 4 | — | 26.8% |
| MathArena Final-Answer Competitions | — | 76.3% |
| ProofBench | — | 31% |
| Omni-MATH | 30.4% | — |
| MATH Level 5 | 61.9% | — |
| FrontierMath Tier 4 (v1) | — | 14.6% |
| GSM8K | 82.4% | — |

## Knowledge

- Gemini 1.5 Flash (May 2024): 26.2 (#260)
- Gemini 3.5 Flash: 66.3 (#11)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.5 Flash |
|---|---|---|
| GPQA Diamond | 47.3% | 92.8% |
| LMArena Expert | 1233 | 1495 |
| SimpleQA Verified | — | 66.2% |
| MMLU-Pro | 67.8% | — |
| GPQA (HELM) | 43.7% | — |
| BoolQ | 85.8% | — |
| MMLU | 77.9% | — |

## Multimodal

- Gemini 1.5 Flash (May 2024): 36.0 (#81)
- Gemini 3.5 Flash: 45.7 (#15)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.5 Flash |
|---|---|---|
| LMArena Vision | 1141 | 1310 |
| Video-MME | 70.3% | — |
| GeoBench | 76% | — |
| Blueprint-Bench 2 | — | 33.6% |
| LMArena Document | — | 1463 |

## Multilingual

- Gemini 1.5 Flash (May 2024): 42.9 (#189)
- Gemini 3.5 Flash: 57.0 (#13)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1278 | 1476 |
| LMArena Chinese | 1295 | 1526 |
| LMArena French | 1258 | 1490 |
| LMArena German | 1262 | 1492 |
| LMArena Japanese | 1252 | 1486 |
| LMArena Korean | 1221 | 1451 |
| LMArena Russian | 1288 | 1493 |
| LMArena Spanish | 1243 | 1480 |

## Instruction Following

- Gemini 1.5 Flash (May 2024): 66.8 (#205)
- Gemini 3.5 Flash: 77.0 (#30)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1258 | 1467 |
| IFEval | 83.1% | — |

## Long Context

- Gemini 1.5 Flash (May 2024): 39.0 (#187)
- Gemini 3.5 Flash: 45.4 (#38)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1284 | 1482 |

## Writing & Preference

- Gemini 1.5 Flash (May 2024): 48.7 (#196)
- Gemini 3.5 Flash: 65.5 (#47)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 3.5 Flash |
|---|---|---|
| LMArena Text | 1287 | 1482 |
| LMArena Creative Writing | 1285 | 1470 |
| LMArena Multi-Turn | 1253 | 1481 |
| WildBench | 79.2% | — |
| EQ-Bench 4 | — | 1087 |

## FAQ

### Is Gemini 1.5 Flash (May 2024) better than Gemini 3.5 Flash?

Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 33.2 on the Noometry Index.

### Is Gemini 1.5 Flash (May 2024) or Gemini 3.5 Flash better for coding?

Gemini 3.5 Flash scores higher on coding benchmarks: 49.4 versus 34.4 in the Noometry coding category.

### How many benchmarks do Gemini 1.5 Flash (May 2024) and Gemini 3.5 Flash share?

25 benchmarks have published results for both models. Gemini 1.5 Flash (May 2024) has 42 scored results on Noometry and Gemini 3.5 Flash has 54.