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

[chriskuta]

When Codex has more than 5 million weekly active users, and most of these users are pretty happy on a plus plan using an older model (5.3) then what now? Open AI are likely taking a bath on supplying ai compute for this level of 5.3 usage. Adjusting usage limits wouldn’t be cool, so sunset the most in demand model and push everyone to the high usage models. This wouldn’t be so bad if the newer models were that much better to justify the increased price, but I am less productive running 5.4 or 5.5 as it makes a lot of mistakes and requires regular reorientation back to the original prompt goals. And for anyone saying you need to improve / adjust prompting for 5.5. The strength of 5.3 was that it didn’t need to be told what not to do.. I am regularly saying “don’t do that”, and “wtf are you doing that for ffs?”..