Opus 4.6 vs Codex 5.3: We've Officially Entered the 'Benchmarks Don't Matter' Era
Opus 4.6 and Codex 5.3 launched on the same day, but this time nobody’s looking at benchmarks. The AI coding assistant race has shifted from ‘who’s stronger’ to ‘who’s more usable’ — we’ve officially entered an era where system experience matters more than model capability.