How Generative AI is Transforming Modern Web Development in 2026

import { OpenAIStream, StreamingTextResponse } from 'ai';
import { Configuration, OpenAIApi } from 'openai-edge';

export const runtime = 'edge'; // Sub-30ms global cold start

const config = new Configuration({ apiKey: process.env.OPENAI_API_KEY });
const openai = new OpenAIApi(config);

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

  // 1. Fetch proprietary semantic context from Vector DB
  const relevantDocs = await queryVectorDB(contextVectorId, messages);

  // 2. Stream generation with strict system prompt
  const response = await openai.createChatCompletion({
    model: 'gpt-4o',
    stream: true,
    temperature: 0.2,
    messages: [
      {
        role: 'system',
        content: `You are an enterprise AI architect. Answer ONLY using this context: ${relevantDocs}`
      },
      ...messages
    ]
  });

  const stream = OpenAIStream(response);
  return new StreamingTextResponse(stream);
}