Update generate.ts

swapping in "gpt-3.5-turbo-instruct" model in place of "text-davinci-003" as recommended on the OpenAI Deprecations page: https://platform.openai.com/docs/deprecations/2023-07-06-gpt-and-embeddings

pages/api/generate.ts

@@ -18,7 +18,7 @@ const handler = async (req: Request): Promise<Response> => {
   }
 
   const payload: OpenAIStreamPayload = {
-    model: "text-davinci-003",
+    model: "gpt-3.5-turbo-instruct",
     prompt,
     temperature: 0.7,
     top_p: 1,