ChatGPT custom instructions for repeatable behavior.

A prompt usually tells ChatGPT what to do once. A custom instruction tells ChatGPT how to behave across conversations: the role it should take, the assumptions it should make, the format it should prefer, and the style it should follow.

Superpower lets you keep multiple instruction profiles, so you can switch from a coding reviewer to a writing editor, research assistant, tutor, or business strategist without rewriting the same setup every time.