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It's the other way around - Claude Code is the proprietary one. Codex CLI is open source: https://github.com/openai/codex https://github.com/openai/codex You
by mike_hearn 8mo ago
It's the other way around - Claude Code is the proprietary one. Codex CLI is open source:
https://github.com/openai/codex https://github.com/openai/codex
You can definitely access the latest models via the API. That's how Codex CLI works.
- pizlonator 8mo agogpt-5.3 was not accessible via API, at least for me But it was in codex
- mike_hearn 8mo agoAh ha, I know what you're hitting. 5.3-codex is only available via the Responses API, not the Completions API. Two different APIs for model access. If you were using Completions you have to port to Responses. It's not that hard. I did this for my own agent the other week. I think it might be like that for all their new models from now on. Responses is a much more powerful API. It's more like a front to ChatGPT than the underlying models.
- pizlonator 8mo agoI am using responses API (these days I only use responses API when talking to OpenAI) I'll try again, maybe I was doing something else wrong, or something changed
- mike_hearn 8mo agoOK, in that case I'm not sure. But Codex can't hide anything. I don't think there are special codes compiled into the binaries or anything like that.