I haven’t noticed much hype around Codex. I have both and use Claude for broad work off my phone and Codex on my computer to clean up the mess. Crank reasoning to the highest setting for each. Claude is extremely unreliable for me, and Codex feels like more of a real tool. I’d say Codex has a bit of a learning curve. Nothing much has changed for me in the past month or two (whenever GPT 5.4 came out).