LIVE INTELLIGENCE · part of the Xentir AI Index

Claude Haiku 4.5 vs Claude Opus 4

Claude Haiku 4.5 · Anthropic, released 2025-10-15
Claude Opus 4 · Anthropic, released 2025-05-22

“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 Haiku 4.5 leads on 3, Claude Opus 4 leads on 3.

Benchmark	Claude Haiku 4.5	Claude Opus 4	Leads
Epoch Capabilities Index (ECI)	142.9	142.9	Claude Opus 4
SWE-bench Verified	Not measured	0.707	Not measured on both
GPQA Diamond	0.712 (32k)	0.763 (16k)	Claude Opus 4
MATH Level 5	0.964 (32k)	0.850	Claude Haiku 4.5
OTIS Mock AIME 2024-2025	0.667 (32k)	0.644 (27k)	Claude Haiku 4.5
FrontierMath	0.059 (32k)	0.045	Claude Haiku 4.5
FrontierMath Tier 4	0.021 (32k)	0.042 (27k)	Claude Opus 4
SimpleQA Verified	0.059 (32k)	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 Haiku 4.5 → · Claude Opus 4 → · the full AI Model Rankings table