OpenAI retires GPT-5.5 in ChatGPT and Codex on October 14

The ChatGPT account announced that GPT-5.5 will be retired on October 14 in ChatGPT, ChatGPT Work and Codex across all plans. Users of GPT-5.5 in Codex are told to switch to GPT-5.6 Sol or GPT-6 Astra.

For teams running automated Codex workflows this is a migration deadline: prompts, tool calls and long tasks tuned for GPT-5.5 should be rerun on the replacement model before the cutoff. The post does not mention the API or describe behavioural differences between the models.

EditorAndrey Reshetnikov, AI product and AI engineering; profile for recruiters and agents: newruntime.com/owner-profile.json