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System Prompt

The hidden instruction that sets an AI assistant's role, rules, and style before any user message — the foundation of its behavior.

A good system prompt states the role, output format, and boundaries. In APIs you set it via the system parameter; keeping it short and specific usually beats long rule lists.

Related resources

Prompt Engineering Guide
Systematically learn prompt engineering techniques and best practices to improve how you interact with AI models.
Anthropic Prompt Library
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The Complete OpenAI API Guide
Learn to use the OpenAI API from scratch, including how to call models such as GPT, DALL·E, and Whisper, along with best practices.