OpenAI's Codex desktop adds past-message editing on Day 14

Day 14's update is a usability change for Codex desktop, not a new model or reset. It follows a series of daily announcements under OpenAI's '28 days of shipping' banner, which have included model speed improvements, context window expansions, and global resets on Days 6, 8, 10, and 13. The editing feature is distinct from those resets and from existing conversation controls like Steer, Queue, and Fork. Steer lets users redirect an in-progress task, Queue schedules a follow-up instruction, and Fork branches a conversation from an earlier point. Editing a past message, by contrast, changes the original instruction itself. Editing a message does not automatically undo any of those side effects, so users are advised to check Git status and GitHub separately; Codex can modify files, run tests, and interact with GitHub. Because OpenAI has not detailed how edits affect re-execution or history branching, testing the feature in a small, non-destructive thread before using it on production repositories is recommended.