From the source

Custom instructions for ChatGPT

Capability change

OpenAI is rolling out custom instructions for ChatGPT, allowing users to set preferences that ChatGPT will keep in mind for all future conversations.

From the source
We’re rolling out custom instructions to give you more control over how ChatGPT responds. Set your preferences, and ChatGPT will keep them in mind for all future conversations.
openai.com

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