GPT-5.2 and GPT-5.3-Codex have been sunset in Codex with ChatGPT subscriptions
OpenAI Developer Community
June 9, 2026
What a bizar move to remove the only Codex model from … Codex!
GPT5.5 works fine for adjustments, but codex5.3 was clearly making better/compact code after a good prompt.
This will cost customers (I hope, so it comes back).
Discussion in the ATmosphere