Update app.py

app.py

@@ -21,7 +21,7 @@ openai.api_key = os.getenv("OPENAI_API_KEY")
 # Function to call OpenAI API to refine and translate text
 def refine_text(prompt):
     response = openai.ChatCompletion.create(
-        model="gpt-4",
+        model="gpt-3.5-turbo-16k",
         messages=[
             {"role": "system", "content": "You are an assistant that refines text to make it conversational and natural. If the question is in Swahili, respond in Swahili."},
             {"role": "user", "content": prompt}