Opus 4.5 changed everything and it's all about AX (Agent Experience)

Why watch

This Changelog episode discusses how Claude Opus 4.5 represented a significant step function in AI agent capabilities, marking a shift toward prioritizing Agent Experience (AX). Burke Holland (GitHub Copilot developer) and host analyze how Opus 4.5 triggered widespread adoption and how GPT-5.3 Codex continues the momentum. For developers and tech professionals tracking AI coding assistant evolution.