LIVE INTELLIGENCE · part of the Xentir AI Index

Gemini 3.5 Flash vs GPT-5.2 Pro

Gemini 3.5 Flash · Google, released 2026-05-19
GPT-5.2 Pro · OpenAI, released 2025-12-11

“Epoch AI, 'AI Benchmarking Hub'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks' [online resource].” · epoch.ai/benchmarks · Licensed CC BY 4.0 · data last verified 2026-07-26 · Methodology · Data Sources

Head-to-head

Measured on 2 of 9 tracked benchmarks for both models — GPT-5.2 Pro leads on 2.

Benchmark	Gemini 3.5 Flash	GPT-5.2 Pro	Leads
Epoch Capabilities Index (ECI)	154.6	154.7	GPT-5.2 Pro
SWE-bench Verified	0.793 (high)	Not measured	Not measured on both
GPQA Diamond	0.928 (high)	Not measured	Not measured on both
MATH Level 5	Not measured	Not measured	Not measured on both
OTIS Mock AIME 2024-2025	0.956 (high)	Not measured	Not measured on both
FrontierMath	0.390 (high)	Not measured	Not measured on both
FrontierMath Tier 4	0.146 (high)	0.313 (webapp)	GPT-5.2 Pro
SimpleQA Verified	0.684 (high)	Not measured	Not measured on both
Chess Puzzles	0.500 (high)	Not measured	Not measured on both

Benchmark results measure specific tasks and should not be treated as a universal measure of model quality. A model with no row here for a benchmark has not been measured on it — that is left blank, never estimated.

Full profiles

Gemini 3.5 Flash → · GPT-5.2 Pro → · the full AI Model Rankings table