The answer
It sets the overall behavior, persona, and constraints of the assistant before the user interacts with it.
OpenAI API Guide: How to Integrate GPT Models in Your App
What is the 'system' message role?
More FAQs in OpenAI API Guide: How to Integrate GPT Models in Your App
Never commit keys to Github or expose them in frontend React code. Always make API requests from a secure backend server.
gpt-4o-mini is a smaller, faster model that is significantly cheaper, while gpt-4o is the flagship model for complex reasoning.
Set the response_format parameter to { type: 'json_object' } and explicitly instruct the model to output JSON in the system prompt.
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