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Using ChatGPT for Planning vs Codex?

OpenAI Developer Community June 13, 2026
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AK-78: > I think you missed the part where they gave ChatGPT ability to write to repos. Really? That could be really good in my situation - like others in this thread, I’m doing a lot of copying and pasting, driven by ChatGPT. I’ll explain briefly how i am using ChatGPT and Codex, but I should preface this by saying I am not a coder (unless you count TMS9900 assembler 40+ years ago), but I do have a technical background, so I have no problem at all following instructions and editing code. I’m currently modernising a very old vBulletin forum, so it can be moved to a modern server running current versions of PHP and MariaDB, (it’s currently running on PHP5.2 / mySQL 5.6). With the help of ChatGPT 5.5 (Extended thinking), I built a LAMP server on a spare computer to use as a staging platform. I’m using git locally to keep track of all changes, with detailed logs, and backups of files and the database. I got the site working on PHP 7.4 /MariaDB 10.6 initially, now it’s working on PHP 8.0 and I’m using Playwright to build a comprehensive test harness. Codex is installed on the staging server and I have used it to do bulk file editing when it has become apparent that the same syntax problems are cropping up repeatedly and there maybe dozens of files that require the same edits. ChatGPT has been writing all the prompts for Codex, but it is being incredibly cautious in what it allows Codex to do, which is a bit frustrating because there has been a huge amount of copy and pasting back and forth between the staging server via putty, and the ChatGPT app on my PC. I’ve been wondering could I have just used Codex to do everything? Or is there a way to interface ChatGPT with the codebase on the staging server, so instead of it instructing me to execute commands could ChatGPT do it directly itself?

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