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gpt-5.3 was not accessible via API, at least for me But it was in codex
by pizlonator 8mo ago
gpt-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.