LIVE INTELLIGENCE · part of the Xentir AI Index

Claude 2 vs Claude 3 Sonnet

Claude 2 · Anthropic, released 2023-07-11
Claude 3 Sonnet · Anthropic, released 2024-02-29

“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 Sonnet leads on 3, tied on 1.

Benchmark	Claude 2	Claude 3 Sonnet	Leads
Epoch Capabilities Index (ECI)	119.6	119.9	Claude 3 Sonnet
SWE-bench Verified	Not measured	Not measured	Not measured on both
GPQA Diamond	0.347	0.406	Claude 3 Sonnet
MATH Level 5	0.117	0.182	Claude 3 Sonnet
OTIS Mock AIME 2024-2025	0.025	0.025	Tied
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 2 → · Claude 3 Sonnet → · the full AI Model Rankings table