Yes
In my daily work the capability difference is the largest single-model jump I've experienced
mattlangston on Hacker News
In the thread “Something Big Is Happening”
Helped: Significant capability jump in Opus 4.6 increased daily productivity.
… The minor version number is misleading. In my daily work the capability difference is the largest single-model jump I've experienced, and I don't say that casually — I spent my career making precision measurements. I keep telling myself I should systematically evaluate GPT-5.3 Codex and the other frontier models. …