Understand it in 10 seconds
A system prompt gives an AI higher-level instructions about its role and behavior.
In plain language
A system prompt gives an AI higher-level instructions about its role and behavior. This describes what the model or system does, not a promise that every product behaves identically.
An analogy
A user prompt is today's assignment; a system prompt is the job description and house rules.
The analogy is a shortcut, not a complete technical definition.
An everyday example
Where you will encounter it
It appears in AI app configuration, API message roles and agent harnesses.
Should you care?
Users should know hidden or product-level instructions may shape answers. Builders need the product-specific details.
How it differs
It is not a universal security boundary. Implementation, visibility and instruction priority vary by product.
Related Terms
Related terms
Continue with these published explanations.
Sources & last checked
Checked against official documentation. Editorial recommendations are distinguished from vendor positioning; no runtime benchmark was performed.
Official documentation
01Last checked: September 5, 2026
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