GPT-5.2 and GPT-5.3-Codex have been sunset in Codex with ChatGPT subscriptions

I was saddened too when my default 5.3-codex model went away as well. I’m transitioning to 5.4 as my daily for the time being but will also be very interested to see if a codex specific model is every post-trained. For those that are on API tiers, it’s worth mentioning that Microsoft and other platforms are still offering models in their fleet. Foundry Models sold by Azure - Microsoft Foundry | Microsoft Learn And if some variant of gpt-5.3-codex ever makes its way into the OSS, I’ll be the first one on board.