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A massive difference between Claude Code and Codex: - Codex lets you use any model you want (not just OpenAI) and harness is open source - Claude Code doesn’t and is closed source Given this is the two leading AI labs, notable difference in approaches
Codex doesn't lock you into OpenAI models. Tibo @thsottiaux on why: "If you are part of this community and building an excellent coding harness, why would you couple it to your model? That felt quite disappointing, to make that decision. It didn't feel right. And it's open source in the first place. It would have been trivial for anyone to fork it. But then you're encouraging people to go and use that fork, and now suddenly you have overhead and the only reason you have a fork is because you wanted to change 10 lines of code to add support for another model provider. That feels very silly. So why not just support it in the first place? The other thing is we benefit a lot from being able to give optionality. Maybe today you love using OpenAI models and you're super productive with them, but tomorrow there's a new model that comes out and you want to try that. Why force you to completely change your setup just to try a new model? Optionality is very important to companies that we work with. And this is something that we absolutely lean into."