# Gemini 1.5 Flash (May 2024) vs Gemini 2.5 Pro

> Gemini 2.5 Pro is the stronger model overall, scoring 45.0 to 33.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-1-5-flash-vs-gemini-2-5-pro
- Last updated: 2026-10-10
- Shared benchmarks: 33

## Summary

- They share 33 benchmarks with published results for both. Gemini 1.5 Flash (May 2024) scores higher in 0 categories and Gemini 2.5 Pro in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Gemini 2.5 Pro leads 56.0 to 26.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 16.3% for Gemini 1.5 Flash (May 2024) and 84.7% for Gemini 2.5 Pro.

## Snapshot

| | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Pro |
|---|---|---|
| Provider | Google | Google |
| Noometry Index | 33.2 | 45.0 |
| Rank | 246 | 75 |
| Context | — | 1.05M |
| Input $/M | — | $1.25 |
| Output $/M | — | $10 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 1.5 Flash (May 2024): 34.4 (#236)
- Gemini 2.5 Pro: 42.4 (#101)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Pro |
|---|---|---|
| WeirdML | 24.9% | 54% |
| LMArena Coding | 1261 | 1452 |
| SWE-bench Verified | — | 57.6% |
| SWE-bench Verified (bash only) | — | 53.6% |
| Aider Polyglot | — | 83.1% |
| LMArena WebDev | — | 1227 |
| SciCode | — | 42.8% |
| GSO | — | 3.9% |
| BigCodeBench Instruct | 43.5% | — |
| LiveBench Coding | — | 85.9% |
| BigCodeBench Complete | 55.1% | — |
| CadEval | — | 64% |
| ALE-Bench | — | 785.52 |
| AlgoTune | — | 1.51 |
| HumanEval+ | 75.6% | — |
| MBPP+ | 67.5% | — |

## Agentic & Tool Use

- Gemini 1.5 Flash (May 2024): 26.6 (#102)
- Gemini 2.5 Pro: 29.2 (#88)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Pro |
|---|---|---|
| BALROG | 14.6% | 43.3% |
| Terminal-Bench | — | 32.6% |
| GDPval | — | 23.3% |
| Remote Labor Index | — | 0.8% |
| TheAgentCompany | — | 30.3% |
| τ²-bench Banking | — | 13.7% |
| DeepResearch Bench | — | 42.8% |
| LMArena Search | — | 1142 |
| METR Time Horizons | — | 55.4% |
| Vending-Bench 2 | — | 573.64 |

## Reasoning

- Gemini 1.5 Flash (May 2024): 21.7 (#215)
- Gemini 2.5 Pro: 28.8 (#99)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Pro |
|---|---|---|
| LMArena Hard Prompts | 1257 | 1455 |
| DTBench | 53.8% | 82.4% |
| Epoch Capabilities Index | 129.36 | 145.32 |
| ForecastBench | 53.9 | 61.3 |
| ARC-AGI-2 | — | 4.9% |
| SimpleBench | — | 62.4% |
| Kagi LLM Benchmark | — | 70.3% |
| ARC-AGI-1 | — | 41% |
| CritPt | — | 2% |
| Chess Puzzles | — | 20% |
| EnigmaEval | — | 5.6% |
| LiveBench Reasoning | — | 89.8% |
| LiveBench Data Analysis | — | 79.9% |
| LMCA | — | 34.8% |
| LiveBench | — | 82.3% |
| PIQA | 87.5% | — |

## Math

- Gemini 1.5 Flash (May 2024): 22.1 (#281)
- Gemini 2.5 Pro: 32.5 (#213)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 16.3% | 84.7% |
| Omni-MATH | 30.4% | 41.6% |
| LMArena Math | 1269 | 1450 |
| MATH Level 5 | 61.9% | 95.9% |
| FrontierMath (Feb 2025 set) | 0% | 14.1% |
| FrontierMath (Tiers 1-3) | — | 24.6% |
| FrontierMath Tier 4 | — | 0% |
| LiveBench Math | — | 90.2% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
| GSM8K | 82.4% | — |

## Knowledge

- Gemini 1.5 Flash (May 2024): 26.2 (#260)
- Gemini 2.5 Pro: 56.0 (#46)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Pro |
|---|---|---|
| GPQA Diamond | 47.3% | 85.3% |
| MMLU-Pro | 67.8% | 86.3% |
| GPQA (HELM) | 43.7% | 74.9% |
| LMArena Expert | 1233 | 1452 |
| Humanity's Last Exam | — | 21.6% |
| Confabulations | — | 10.6% |
| Vectara Hallucination Rate | — | 7% |
| BoolQ | 85.8% | — |
| MMLU | 77.9% | — |

## Multimodal

- Gemini 1.5 Flash (May 2024): 36.0 (#81)
- Gemini 2.5 Pro: 45.2 (#18)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Pro |
|---|---|---|
| LMArena Vision | 1141 | 1263 |
| GeoBench | 76% | 86% |
| Video-MME | 70.3% | — |
| VPCT | — | 48% |
| LMArena Document | — | 1421 |
| SpatialViz-Bench | — | 44.7% |

## Multilingual

- Gemini 1.5 Flash (May 2024): 42.9 (#189)
- Gemini 2.5 Pro: 55.3 (#31)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Pro |
|---|---|---|
| LMArena Non-English | 1278 | 1451 |
| LMArena Chinese | 1295 | 1507 |
| LMArena French | 1258 | 1472 |
| LMArena German | 1262 | 1487 |
| LMArena Japanese | 1252 | 1461 |
| LMArena Korean | 1221 | 1434 |
| LMArena Russian | 1288 | 1461 |
| LMArena Spanish | 1243 | 1473 |

## Instruction Following

- Gemini 1.5 Flash (May 2024): 66.8 (#205)
- Gemini 2.5 Pro: 75.0 (#75)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Pro |
|---|---|---|
| IFEval | 83.1% | 84% |
| LMArena Instruction Following | 1258 | 1437 |
| LiveBench Instruction Following | — | 80.6% |

## Long Context

- Gemini 1.5 Flash (May 2024): 39.0 (#187)
- Gemini 2.5 Pro: 59.8 (#5)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Pro |
|---|---|---|
| LMArena Longer Query | 1284 | 1449 |
| Fiction.LiveBench | — | 91.7% |

## Writing & Preference

- Gemini 1.5 Flash (May 2024): 48.7 (#196)
- Gemini 2.5 Pro: 63.7 (#62)

| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Pro |
|---|---|---|
| LMArena Text | 1287 | 1458 |
| LMArena Creative Writing | 1285 | 1454 |
| WildBench | 79.2% | 85.7% |
| LMArena Multi-Turn | 1253 | 1453 |
| Short-Story Creative Writing | — | 83.8% |
| EQ-Bench Creative Writing | — | 1421 |
| LiveBench Language | — | 67.8% |

## FAQ

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

Gemini 2.5 Pro is the stronger model overall, scoring 45.0 to 33.2 on the Noometry Index.

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

Gemini 2.5 Pro scores higher on coding benchmarks: 42.4 versus 34.4 in the Noometry coding category.

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

33 benchmarks have published results for both models. Gemini 1.5 Flash (May 2024) has 42 scored results on Noometry and Gemini 2.5 Pro has 78.