LIVE INTELLIGENCE · part of the Xentir AI Index

Claude Opus 4.8 vs GPT-5.4 Pro

Claude Opus 4.8 · Anthropic, released 2026-05-28
GPT-5.4 Pro · OpenAI, released 2026-03-05

“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 6 of 9 tracked benchmarks for both models — Claude Opus 4.8 leads on 1, GPT-5.4 Pro leads on 5.

Benchmark	Claude Opus 4.8	GPT-5.4 Pro	Leads
Epoch Capabilities Index (ECI)	158.0	157.9	Claude Opus 4.8
SWE-bench Verified	Not measured	Not measured	Not measured on both
GPQA Diamond	0.910 (max)	0.946 (xhigh)	GPT-5.4 Pro
MATH Level 5	Not measured	Not measured	Not measured on both
OTIS Mock AIME 2024-2025	0.983 (max)	Not measured	Not measured on both
FrontierMath	0.472 (max)	0.500 (xhigh)	GPT-5.4 Pro
FrontierMath Tier 4	0.312 (max)	0.375 (web-app)	GPT-5.4 Pro
SimpleQA Verified	0.395 (max)	0.478 (xhigh)	GPT-5.4 Pro
Chess Puzzles	0.340 (max)	0.586 (xhigh)	GPT-5.4 Pro

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 Opus 4.8 → · GPT-5.4 Pro → · the full AI Model Rankings table