# Gemini 1.5 Flash (May 2024) vs GPT-5.3 Chat

> GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 33.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-1-5-flash-vs-gpt-5-3-chat
- Last updated: 2026-10-12
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Gemini 1.5 Flash (May 2024) scores higher in 0 categories and GPT-5.3 Chat in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.3 Chat leads 38.2 to 22.1.

## Snapshot

| | Gemini 1.5 Flash (May 2024) | GPT-5.3 Chat |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 33.2 | 42.8 |
| Rank | 246 | 109 |
| Context | — | 128K |
| Input $/M | — | $1.75 |
| Output $/M | — | $14 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 1.5 Flash (May 2024): 34.4 (#236)
- GPT-5.3 Chat: 41.4 (#124)

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Coding | 1261 | 1408 |
| WeirdML | 24.9% | — |
| BigCodeBench Instruct | 43.5% | — |
| BigCodeBench Complete | 55.1% | — |
| HumanEval+ | 75.6% | — |
| MBPP+ | 67.5% | — |

## Agentic & Tool Use

- Gemini 1.5 Flash (May 2024): 26.6 (#102)
- GPT-5.3 Chat: —

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.3 Chat |
|---|---|---|
| BALROG | 14.6% | — |

## Reasoning

- Gemini 1.5 Flash (May 2024): 21.7 (#215)
- GPT-5.3 Chat: 28.5 (#102)

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Hard Prompts | 1257 | 1399 |
| DTBench | 53.8% | — |
| Epoch Capabilities Index | 129.36 | — |
| ForecastBench | 53.9 | — |
| PIQA | 87.5% | — |

## Math

- Gemini 1.5 Flash (May 2024): 22.1 (#281)
- GPT-5.3 Chat: 38.2 (#142)

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Math | 1269 | 1389 |
| OTIS Mock AIME 2024-2025 | 16.3% | — |
| 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)
- GPT-5.3 Chat: 38.8 (#140)

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Expert | 1233 | 1397 |
| GPQA Diamond | 47.3% | — |
| MMLU-Pro | 67.8% | — |
| GPQA (HELM) | 43.7% | — |
| BoolQ | 85.8% | — |
| MMLU | 77.9% | — |

## Multimodal

- Gemini 1.5 Flash (May 2024): 36.0 (#81)
- GPT-5.3 Chat: —

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Vision | 1141 | — |
| Video-MME | 70.3% | — |
| GeoBench | 76% | — |

## Multilingual

- Gemini 1.5 Flash (May 2024): 42.9 (#189)
- GPT-5.3 Chat: 50.3 (#124)

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Non-English | 1278 | 1382 |
| LMArena Chinese | 1295 | 1432 |
| LMArena French | 1258 | 1397 |
| LMArena German | 1262 | 1384 |
| LMArena Japanese | 1252 | 1352 |
| LMArena Korean | 1221 | 1346 |
| LMArena Russian | 1288 | 1400 |
| LMArena Spanish | 1243 | 1371 |

## Instruction Following

- Gemini 1.5 Flash (May 2024): 66.8 (#205)
- GPT-5.3 Chat: 72.8 (#129)

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Instruction Following | 1258 | 1378 |
| IFEval | 83.1% | — |

## Long Context

- Gemini 1.5 Flash (May 2024): 39.0 (#187)
- GPT-5.3 Chat: 42.6 (#120)

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Longer Query | 1284 | 1396 |

## Writing & Preference

- Gemini 1.5 Flash (May 2024): 48.7 (#196)
- GPT-5.3 Chat: 63.1 (#68)

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Text | 1287 | 1389 |
| LMArena Creative Writing | 1285 | 1355 |
| LMArena Multi-Turn | 1253 | 1412 |
| EQ-Bench Creative Writing | — | 1690 |
| WildBench | 79.2% | — |

## FAQ

### Is Gemini 1.5 Flash (May 2024) better than GPT-5.3 Chat?

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 33.2 on the Noometry Index.

### Is Gemini 1.5 Flash (May 2024) or GPT-5.3 Chat better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 34.4 in the Noometry coding category.

### How many benchmarks do Gemini 1.5 Flash (May 2024) and GPT-5.3 Chat share?

17 benchmarks have published results for both models. Gemini 1.5 Flash (May 2024) has 42 scored results on Noometry and GPT-5.3 Chat has 18.