Update completion example.

examples/next-openai/app/api/completion/route.ts

@@ -1,27 +1,16 @@
-import OpenAI from 'openai';
-import {
-  OpenAIStream,
-  StreamingTextResponse,
-  experimental_StreamData,
-} from 'ai';
+import { StreamingTextResponse, experimental_StreamData } from 'ai';
+import { streamText } from 'ai/core';
+import { openai } from 'ai/openai';
 
-// Create an OpenAI API client (that's edge friendly!)
-const openai = new OpenAI({
-  apiKey: process.env.OPENAI_API_KEY || '',
-});
-
-// IMPORTANT! Set the runtime to edge
 export const runtime = 'edge';
 
 export async function POST(req: Request) {
   // Extract the `prompt` from the body of the request
   const { prompt } = await req.json();
 
-  // Ask OpenAI for a streaming completion given the prompt
-  const response = await openai.completions.create({
-    model: 'gpt-3.5-turbo-instruct',
-    max_tokens: 2000,
-    stream: true,
+  const result = await streamText({
+    model: openai.completion('gpt-3.5-turbo-instruct'),
+    maxTokens: 2000,
     prompt,
   });
 
@@ -31,7 +20,7 @@ export async function POST(req: Request) {
   data.append({ test: 'value' });
 
   // Convert the response into a friendly text-stream
-  const stream = OpenAIStream(response, {
+  const stream = result.toAIStream({
     onFinal(completion) {
       data.close();
     },