The system prompt is a hidden instruction given to ChatGPT before any user message, used to set behavior, tone, and constraints.
What It Controls
- The persona the model adopts
- Topics it will or will not discuss
- Response format and length
- Language and tone
When you use ChatGPT on OpenAI.com, OpenAI's system prompt shapes the default behavior. When developers use the API, they write their own system prompts to customize the assistant for their product.
Reference:
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