Codex defaults are now an ops check
Quiet day, useful shift. An OpenAI Help Center item says GPT-5.4 and GPT-5.4 mini are no longer available in Codex for users signed in with a ChatGPT account, with replacements listed as GPT-5.6 Terra and GPT-5.6 Luna. The practical point is not the model names. It is that saved model settings, workspace defaults, managed configurations, and automations can drift when the platform changes. Treat Codex like deploy infrastructure: record which model each workspace uses, what it is allowed to touch, and which automations depend on it. This is an audit task, not a research task.