LIVE INTELLIGENCE · part of the Xentir AI Index

Claude 3 Opus vs GPT-4o mini

Claude 3 Opus · Anthropic, released 2024-02-29
GPT-4o mini · OpenAI, released 2024-07-18

“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 4 of 9 tracked benchmarks for both models — Claude 3 Opus leads on 1, GPT-4o mini leads on 3.

Benchmark	Claude 3 Opus	GPT-4o mini	Leads
Epoch Capabilities Index (ECI)	126.9	126.9	GPT-4o mini
SWE-bench Verified	Not measured	Not measured	Not measured on both
GPQA Diamond	0.472	0.377	Claude 3 Opus
MATH Level 5	0.375	0.526	GPT-4o mini
OTIS Mock AIME 2024-2025	0.047	0.069	GPT-4o mini
FrontierMath	Not measured	Not measured	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.

Full profiles

Claude 3 Opus → · GPT-4o mini → · the full AI Model Rankings table