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The system prompt is the most powerful tool for customizing how the model behaves — it sets the context, persona, constraints, and output format.

What to Put in System Prompts

  • Role and persona: "You are a senior software engineer at a fintech company"
  • Behavior rules: "Always ask clarifying questions before answering"
  • Output format: "Respond only in JSON with keys: summary, sentiment, score"
  • Constraints: "Never discuss competitor products"
  • Knowledge context: Paste in relevant company or product information

Key Principle

More specific system prompts = more consistent, predictable outputs. Vague system prompts = variable results.


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Reference:

OpenAI prompt engineering guide

image for linkhttps://en.wikipedia.org/wiki/Special:Search?search=System%20Prompts

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