// Hacker Noon · 15 May 2026

Codex 5.3 vs Claude Opus 4.6 on a Real Java Monolith

I copied the same Java project into two branches, gave Codex 5.3 and Claude Opus 4.6 the same vague prompt, and compared what actually survived tests, reviews, and real Telegram bot behavior. The result: cheaper is better.

Hacker Noon

@hacker-noon · Nikolay Girchev

hackernoon.com

Hacker Noon@hacker-noon