Add to Chrome — free

What is System prompt?

A system prompt is a hidden instruction that sets an AI's role and rules before your message. Chat with all AI uses a short system prompt that tells the model which model it is and how to format answers.

Updated November 13, 20262 min read

In practice

You can still steer behavior with your own instructions in the chat.

Related in Chat with all AI

See the models, prompt tips and how to reduce hallucinations.

Every top AI model, one side panel

Try GPT-6.1, Claude, Muse and Grok free — 3 requests, no card needed.

Add to Chrome