Change gpt4 to gpt3.5

Author: pooriaarab

src/models/chat.ts

@@ -17,7 +17,7 @@ const params = {
   verbose: true,
   temperature: 1,
   openAIApiKey,
-  modelName: process.env.OPENAI_MODEL ?? "gpt-4",
+  modelName: process.env.OPENAI_MODEL ?? "gpt-3.5-turbo",
   maxConcurrency: 1,
   maxTokens: 1000,
   maxRetries: 5,