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

I wanted to share my genuine disappointment with the removal of GPT-5.3-Codex from the Codex platform as of June 2nd. While I understand the reasoning around fleet simplification, this change has a real impact on day-to-day usability — especially for Plus subscribers. GPT-5.5 consumes roughly 3× more reasoning time per minute than GPT-5.3-Codex, which means we’ve gone from ~60 minutes of usable reasoning time per session to just ~20 minutes. That’s not a minor tradeoff — it fundamentally changes how I’m able to use Codex for longer, more complex tasks. GPT-5.3-Codex struck a great balance between capability and efficiency. Forcing a switch to a model that burns through limits that much faster, without a corresponding increase in allocations, feels like a step backward for users who relied on it. I’d strongly encourage the team to either restore access to GPT-5.3-Codex, offer an opt-in for users who prefer it, or adjust reasoning time limits to compensate for GPT-5.5’s higher consumption rate. Thank you for reading — I hope this feedback is taken into account.