It's slow and stupid. It does not do proper research. It does not follow instructions. It randomly decides to stop being agentic, and instead just dumps the code for me to paste. It has the extremely annoying habit of just doing stuff without understanding what I meant, making a mess, then claiming everything is fine. The outdated training data is extremely annoying when working with Nuxt 4+. It is not creative at solving problems. It dosent show the thinking. The Undo code does not give proper feedback on the diff and if it actually did "undo." And I hate the personality. It HAS to be better than it comes off for me because I am actually in a bad mood after having worked with it. I would rather YOLO code with Gemini 3 flash, since it's actually smarter in my assessment, and at least I can iterate faster, and it feels like it has better common sense.
Just as an example, I found an old, terrible app I made years ago for our firm that handles room reservations. I told it to update from Bootstrap to Flowbite UI. Codex just took forever to make a mess, installed version 2.7 when 4.0.1 is the latest, even when I explicitly stated that it should use the absolute latest version. Then it tried to install it and failed, so it reverted to the outdated CDN.
I gave the same task to Claude Code. Same prompt. It one-shotted it quickly. Then I asked it to swap out ALL the fetch logic to have SPA-like functionality with the new beta 4 version of HTMX, and it one-shot that too in the time Codex spent just trying to read a few files in the project.
This reminds me of the feeling I had when I got the Nokia N800. It was so promising on paper, but the product was so bad and terrible to use that I knew Nokia was done for. If this was their take on what an acceptable smartphone could be, it proves that the whole foundation is doomed. If this is OpenAI's take on what an agentic coding assistant should be—something that can run by itself and iterate until it completes its task in an intelligent and creative way.... OpenAI is doomed.
If you need it to be up to date with your version of a framework, then ask it to use the context7 mcp server. Expecting training data to be up to date is unreasonable for any LLM and we now have useful solutions to the training data issue.
If you need it to specify the latest version, don't say "latest". That word would be interpreted differently by humans as well.
Claude is well known at its one-shotting skills. But that's at the expense of strict instruction following adherence and thinner context (it doesn't spend as much time to gather context in larger codebases).