Next.js AI Streaming Route Handler

// app/api/chat/route.ts
import { openai } from "@ai-sdk/openai";
import { streamText } from "ai";

export const runtime = "edge";

export async function POST(req: Request) {
  const { messages } = await req.json();

  const result = streamText({
    model: openai("gpt-4o"),
    system: "You are a helpful coding assistant.",
    messages,
  });

  return result.toDataStreamResponse();
}