[GPT-5.5 to be discontinued from ChatGPT, Work, and Codex on October 14] Odaily Planet Daily reports that ChatGPT announced on the X platform that GPT-5.5 will officially be discontinued from all plans of ChatGPT, ChatGPT Work, and Codex starting October 14. Users currently utilizing GPT-5.5 in Codex need to switch to GPT-5.6 Sol or GPT-6 Astra.