AI_SLANG_ENTRY
System Prompt Meaning
The hidden or high-priority instruction layer that tells an AI assistant what it is, what rules matter, and how to behave before the user starts typing.
What does System Prompt mean?
The hidden or high-priority instruction layer that tells an AI assistant what it is, what rules matter, and how to behave before the user starts typing.
A system prompt is the instruction layer the app sets before the conversation. It usually has more authority than ordinary user text.
Origin and usage
Came from chat-model APIs and assistant products where messages have roles and different authority levels; builders turned it into shorthand for the model's backstage rulebook.
Source type: technical-term. Last checked: 2026-07-05.
Builder term grounded in role-based model APIs and model-behavior specs; exact implementation differs by provider, so the entry describes common usage rather than one universal standard.
Examples
- The chatbot sounded weird because the system prompt was doing three jobs at once.
- A leaked system prompt is not the whole product, but it explains a lot of the behavior.