Chat & Text

System Prompts & Personas

Shape model behaviour with a system message. Use this to set a persona, constrain output format, or inject context.

JSON-only output

json

{
  "provider": "openai",
  "model": "gpt-4o-mini",
  "messages": [
    {
      "role": "system",
      "content": "You are a data extraction assistant. Always respond with valid JSON only. No prose."
    },
    {
      "role": "user",
      "content": "Extract name, email, and company from: Hi, I'm Jane Doe, jane@acme.com, Acme Corp."
    }
  ],
  "max_tokens": 128,
  "temperature": 0
}

Customer support persona

json

{
  "provider": "anthropic",
  "model": "claude-sonnet-4-6",
  "messages": [
    {
      "role": "system",
      "content": "You are Aria, a friendly and knowledgeable support agent for OneInfer. Be concise and helpful. If you don't know the answer, say so and offer to escalate."
    },
    {
      "role": "user",
      "content": "My API call keeps returning 401. What should I do?"
    }
  ],
  "max_tokens": 256,
  "temperature": 0.4
}