Codex has changed how I work. I used to create a lot more ChatGPT or Claude projects, fill them with stuff, and add conversations to them over time. Now I start Codex threads and just run them until a project ends. I pin them in my sidebar and ask Codex to add stuff into the workspace for the thread as needed. All prior conversations are in one thread. Compaction happens as needed.
I don't do this for all projects. If they're shared, I might use a ChatGPT project, since everyone at work has ChatGPT. If they involve a lot of file work or are Git versioned, I might use a Codex or Claude Cowork project. But for many projects, a single thread in Codex is sufficient.
What might be nice is an easy way to turn a non-project thread into a project. I'd hate for that to introduce any messiness into Codex because I find it overall quite elegant right now. But I can imagine times when something evolves from a thread and would benefit from its own project workspace.
But I guess I could just tell Codex to move everything into a new project folder, so it's not really a big deal.