# Gemini 1.5 Flash (May 2024) vs GPT-5.2 Codex

> GPT-5.2 Codex is the stronger model overall, scoring 42.2 to 32.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-1-5-flash-vs-gpt-5-2-codex
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in agentic & tool use, where GPT-5.2 Codex leads 40.7 to 26.3.

## Snapshot

| | Gemini 1.5 Flash (May 2024) | GPT-5.2 Codex |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 32.9 | 42.2 |
| Rank | 240 | 107 |
| Context | — | 400K |
| Input $/M | — | $1.75 |
| Output $/M | — | $14 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 1.5 Flash (May 2024): 33.9 (#233)
- GPT-5.2 Codex: 45.4 (#66)

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.2 Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 72.8% |
| LMArena WebDev | — | 1339 |
| SWE-bench Multilingual | — | 66.3% |
| WeirdML | 24.9% | — |
| BigCodeBench Instruct | 43.5% | — |
| LMArena Coding | 1262 | — |
| BigCodeBench Complete | 55.1% | — |
| ALE-Bench | — | 1,300 |
| HumanEval+ | 75.6% | — |
| MBPP+ | 67.5% | — |

## Agentic & Tool Use

- Gemini 1.5 Flash (May 2024): 26.3 (#97)
- GPT-5.2 Codex: 40.7 (#20)

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.2 Codex |
|---|---|---|
| Terminal-Bench | — | 66.5% |
| BALROG | 14.6% | — |

## Reasoning

- Gemini 1.5 Flash (May 2024): 20.8 (#212)
- GPT-5.2 Codex: —

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.2 Codex |
|---|---|---|
| LMArena Hard Prompts | 1257 | — |
| DTBench | 53.8% | — |
| Epoch Capabilities Index | 129.37 | — |
| ForecastBench | 53.9 | — |
| PIQA | 87.5% | — |

## Math

- Gemini 1.5 Flash (May 2024): 20.8 (#274)
- GPT-5.2 Codex: —

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.2 Codex |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 16.3% | — |
| Omni-MATH | 30.4% | — |
| LMArena Math | 1269 | — |
| MATH Level 5 | 61.9% | — |
| FrontierMath (Feb 2025 set) | 0% | — |
| GSM8K | 82.4% | — |

## Knowledge

- Gemini 1.5 Flash (May 2024): 26.2 (#253)
- GPT-5.2 Codex: —

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.2 Codex |
|---|---|---|
| GPQA Diamond | 47.3% | — |
| MMLU-Pro | 67.8% | — |
| GPQA (HELM) | 43.7% | — |
| LMArena Expert | 1233 | — |
| BoolQ | 85.8% | — |
| MMLU | 77.9% | — |

## Multimodal

- Gemini 1.5 Flash (May 2024): 35.3 (#76)
- GPT-5.2 Codex: —

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.2 Codex |
|---|---|---|
| LMArena Vision | 1141 | — |
| Video-MME | 70.3% | — |
| GeoBench | 76% | — |

## Multilingual

- Gemini 1.5 Flash (May 2024): 43.1 (#184)
- GPT-5.2 Codex: —

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.2 Codex |
|---|---|---|
| LMArena Non-English | 1278 | — |
| LMArena Chinese | 1295 | — |
| LMArena French | 1257 | — |
| LMArena German | 1262 | — |
| LMArena Japanese | 1252 | — |
| LMArena Korean | 1220 | — |
| LMArena Russian | 1288 | — |
| LMArena Spanish | 1242 | — |

## Instruction Following

- Gemini 1.5 Flash (May 2024): 67.0 (#199)
- GPT-5.2 Codex: —

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.2 Codex |
|---|---|---|
| IFEval | 83.1% | — |
| LMArena Instruction Following | 1258 | — |

## Long Context

- Gemini 1.5 Flash (May 2024): 39.0 (#182)
- GPT-5.2 Codex: —

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.2 Codex |
|---|---|---|
| LMArena Longer Query | 1284 | — |

## Writing & Preference

- Gemini 1.5 Flash (May 2024): 48.9 (#190)
- GPT-5.2 Codex: —

| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.2 Codex |
|---|---|---|
| LMArena Text | 1287 | — |
| LMArena Creative Writing | 1285 | — |
| WildBench | 79.2% | — |
| LMArena Multi-Turn | 1253 | — |

## FAQ

### Is Gemini 1.5 Flash (May 2024) better than GPT-5.2 Codex?

GPT-5.2 Codex is the stronger model overall, scoring 42.2 to 32.9 on the Noometry Index.

### Is Gemini 1.5 Flash (May 2024) or GPT-5.2 Codex better for coding?

GPT-5.2 Codex scores higher on coding benchmarks: 45.4 versus 33.9 in the Noometry coding category.

### How many benchmarks do Gemini 1.5 Flash (May 2024) and GPT-5.2 Codex share?

0 benchmarks have published results for both models. Gemini 1.5 Flash (May 2024) has 42 scored results on Noometry and GPT-5.2 Codex has 5.