LIVE INTELLIGENCE · part of the Xentir AI Index

Gemini 2.5 Flash (Preview 05 20) vs o1

Gemini 2.5 Flash (Preview 05 20) · Google DeepMind, released 2025-05-20
o1 · OpenAI, released 2024-12-17

“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 — o1 leads on 2.

Benchmark	Gemini 2.5 Flash (Preview 05 20)	o1	Leads
Epoch Capabilities Index (ECI)	142.2	142.7	o1
SWE-bench Verified	Not measured	Not measured	Not measured on both
GPQA Diamond	Not measured	0.768 (high)	Not measured on both
MATH Level 5	Not measured	0.947 (high)	Not measured on both
OTIS Mock AIME 2024-2025	0.708	0.733 (medium)	o1
FrontierMath	Not measured	0.093 (high)	Not measured on both
FrontierMath Tier 4	Not measured	Not measured	Not measured on both
SimpleQA Verified	Not measured	Not measured	Not measured on both
Chess Puzzles	Not measured	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.

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Gemini 2.5 Flash (Preview 05 20) → · o1 → · the full AI Model Rankings table