https://techcrunch.com/2023/08/10/chatgpt-expands-its-custom-instructions-feature-to-free-users/

OpenAI announced that it’s expanding custom instructions — a way to give users more control over how ChatGPT responds — to all users, including those on the free tier of the service. The feature, which was first unveiled in July as a beta for ChatGPT Plus subscribers, allows users to add various preferences and requirements that they want the AI chatbot to consider when responding.

The feature can save users time, so they don’t have to rewrite the same instruction prompts every time they interact with the chatbot, as TechCrunch previously explained.