model

app.py

@@ -27,7 +27,7 @@ def pdf_changes(pdf_doc):
     retriever = db.as_retriever()
     global qa 
     qa = ConversationalRetrievalChain.from_llm(
-        llm=OpenAI(temperature=0.2, max_tokens=-1),  
+        llm=OpenAI(temperature=0.2, model_name="gpt-3.5-turbo"),  
         retriever=retriever, 
         return_source_documents=False)
     return "Ready"