Comment by fredericgalline

I've been switching between both depending on which one is having a good week — and that's the honest answer for most people right now.

But the real issue I ran into wasn't which model is better. It's that every time I switched, I lost weeks of accumulated context. The AI didn't know my project's conventions anymore, didn't remember the architecture decisions, didn't know what was tried and rejected.

What helped me was separating the project context from the tool. Keep the conventions, rules, and decisions in plain files in the repo. Both Claude Code and Codex can read them at session start. Then the question becomes "which model is sharper this week" instead of "can I afford to lose my context."

The answer to your question: it's mostly a wash on capability. The real cost of switching is the context you don't realize you're rebuilding.