# Gemini 2.5 Flash-Lite vs GPT-4.5

> Gemini 2.5 Flash-Lite and GPT-4.5 score almost the same on the Noometry Index (36.4 vs 36.9), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gemini-2-5-flash-lite-vs-gpt-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. Gemini 2.5 Flash-Lite scores higher in 3 categories and GPT-4.5 in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in multimodal, where GPT-4.5 leads 37.0 to 28.6.
- The biggest single-benchmark swing is Fiction.LiveBench: 47.2% for Gemini 2.5 Flash-Lite and 63.9% for GPT-4.5.

## Snapshot

| | Gemini 2.5 Flash-Lite | GPT-4.5 |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 36.4 | 36.9 |
| Rank | 208 | 200 |
| Context | 1.05M | — |
| Input $/M | $0.10 | — |
| Output $/M | $0.40 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 2.5 Flash-Lite: 38.0 (#167)
- GPT-4.5: 41.8 (#102)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-4.5 |
|---|---|---|
| WeirdML | 35.2% | 39.4% |
| LMArena Coding | 1373 | 1397 |
| Aider Polyglot | — | 44.9% |
| LiveBench Coding | — | 75.2% |
| ALE-Bench | 325.9 | — |

## Agentic & Tool Use

- Gemini 2.5 Flash-Lite: 27.8 (#89)
- GPT-4.5: 27.6 (#92)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-4.5 |
|---|---|---|
| Berkeley Function Calling Leaderboard | 36.9% | — |
| Cybench | — | 17.5% |

## Reasoning

- Gemini 2.5 Flash-Lite: 21.5 (#196)
- GPT-4.5: 14.1 (#320)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-4.5 |
|---|---|---|
| LMArena Hard Prompts | 1377 | 1404 |
| Epoch Capabilities Index | 133.93 | 136.74 |
| ARC-AGI-2 | — | 0.8% |
| SimpleBench | — | 34.5% |
| Kagi LLM Benchmark | 40.5% | — |
| ARC-AGI-1 | — | 10.3% |
| EnigmaEval | — | 3.2% |
| LiveBench Reasoning | — | 71.1% |
| DTBench | 62.8% | — |
| LiveBench Data Analysis | — | 64.3% |
| LMCA | 18.1% | — |
| ForecastBench | — | 61.7 |
| LiveBench | — | 69% |

## Math

- Gemini 2.5 Flash-Lite: 35.5 (#144)
- GPT-4.5: 31.0 (#200)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-4.5 |
|---|---|---|
| LMArena Math | 1373 | 1412 |
| OTIS Mock AIME 2024-2025 | — | 37.8% |
| Omni-MATH | 48% | — |
| LiveBench Math | — | 69.3% |
| MATH Level 5 | — | 78.6% |

## Knowledge

- Gemini 2.5 Flash-Lite: 32.1 (#206)
- GPT-4.5: 32.4 (#205)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-4.5 |
|---|---|---|
| LMArena Expert | 1373 | 1394 |
| GPQA Diamond | — | 68.7% |
| Humanity's Last Exam | — | 5.4% |
| MMLU-Pro | 53.7% | — |
| Confabulations | — | 13.6% |
| Vectara Hallucination Rate | 3.3% | — |
| GPQA (HELM) | 30.9% | — |

## Multimodal

- Gemini 2.5 Flash-Lite: 28.6 (#109)
- GPT-4.5: 37.0 (#68)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-4.5 |
|---|---|---|
| LMArena Vision | 1198 | 1195 |
| VPCT | 30% | 45% |

## Multilingual

- Gemini 2.5 Flash-Lite: 49.5 (#129)
- GPT-4.5: 52.7 (#78)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-4.5 |
|---|---|---|
| LMArena Non-English | 1369 | 1413 |
| LMArena Chinese | 1404 | 1421 |
| LMArena French | 1388 | 1417 |
| LMArena German | 1390 | 1457 |
| LMArena Japanese | 1359 | 1416 |
| LMArena Korean | 1358 | 1392 |
| LMArena Russian | 1373 | 1419 |
| LMArena Spanish | 1396 | — |

## Instruction Following

- Gemini 2.5 Flash-Lite: 70.2 (#163)
- GPT-4.5: 72.8 (#129)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-4.5 |
|---|---|---|
| LMArena Instruction Following | 1366 | 1404 |
| LiveBench Instruction Following | — | 72.3% |
| IFEval | 81% | — |

## Long Context

- Gemini 2.5 Flash-Lite: 33.3 (#257)
- GPT-4.5: 40.4 (#150)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-4.5 |
|---|---|---|
| Fiction.LiveBench | 47.2% | 63.9% |
| LMArena Longer Query | 1373 | 1406 |

## Writing & Preference

- Gemini 2.5 Flash-Lite: 57.0 (#130)
- GPT-4.5: 57.1 (#129)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-4.5 |
|---|---|---|
| LMArena Text | 1379 | 1417 |
| LMArena Creative Writing | 1366 | 1394 |
| LMArena Multi-Turn | 1367 | 1444 |
| Short-Story Creative Writing | — | 75.6% |
| EQ-Bench Creative Writing | — | 1258 |
| WildBench | 81.8% | — |
| LiveBench Language | — | 61.5% |

## FAQ

### Is Gemini 2.5 Flash-Lite better than GPT-4.5?

Gemini 2.5 Flash-Lite and GPT-4.5 score almost the same on the Noometry Index (36.4 vs 36.9), so choose on price, context window or the category you care about most.

### Is Gemini 2.5 Flash-Lite or GPT-4.5 better for coding?

GPT-4.5 scores higher on coding benchmarks: 41.8 versus 38.0 in the Noometry coding category.

### How many benchmarks do Gemini 2.5 Flash-Lite and GPT-4.5 share?

21 benchmarks have published results for both models. Gemini 2.5 Flash-Lite has 33 scored results on Noometry and GPT-4.5 has 42.