OpenAI schedules GPT-5.5 retirement and removes Codex-Spark

What changed

GPT-5.5 was scheduled to retire from ChatGPT, ChatGPT Work and Codex on October 14, 2026, on all plans including Business, Enterprise and Edu; the OpenAI API isn’t affected. Separately, the GPT-5.3-Codex-Spark research preview was removed from the desktop app, Codex CLI and IDE extension on September 14, 2026.

Who it affects

Codex users signed in with ChatGPT, and anyone whose configs or scripts select gpt-5.5 or gpt-5.3-codex-spark.

What to do

Move to a replacement model and update saved settings, custom agents, scheduled tasks and scripts.

Source: https://learn.chatgpt.com/docs/changelog#codex-2026-09-14-gpt-55-retirement