hi yes you can do it this the code import { VapiClient } from "@Vapi-ai/server-sdk"; const vapi = new VapiClient({ token: process.env.VAPI_API_KEY! }); const assistant = await vapi.assistants.create({ name: "Your Assistant Name", firstMessage: "Hello! How can I help you today?", // Your custom first message model: { provider: "openai", model: "gpt-4o", messages: [ { role: "system", content: "Your system prompt here" // Your custom system prompt } ] } }); the content is your prommt