LIVE INTELLIGENCE · part of the Xentir AI Index

Claude Sonnet 5 vs Gemini 3 Pro Preview

Claude Sonnet 5 · Anthropic, released 2026-06-30
Gemini 3 Pro Preview · Google DeepMind, released 2025-11-18

“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 5 of 9 tracked benchmarks for both models — Claude Sonnet 5 leads on 3, Gemini 3 Pro Preview leads on 2.

Benchmark	Claude Sonnet 5	Gemini 3 Pro Preview	Leads
Epoch Capabilities Index (ECI)	153.5	153.3	Claude Sonnet 5
SWE-bench Verified	Not measured	0.729	Not measured on both
GPQA Diamond	0.905 (xhigh)	0.926	Gemini 3 Pro Preview
MATH Level 5	Not measured	Not measured	Not measured on both
OTIS Mock AIME 2024-2025	0.947 (xhigh)	0.914	Claude Sonnet 5
FrontierMath	Not measured	0.376	Not measured on both
FrontierMath Tier 4	Not measured	0.188	Not measured on both
SimpleQA Verified	0.250 (xhigh)	0.729	Gemini 3 Pro Preview
Chess Puzzles	0.350 (xhigh)	0.310	Claude Sonnet 5

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

Claude Sonnet 5 → · Gemini 3 Pro Preview → · the full AI Model Rankings table