gpt-3.5-turbo-0613

app.py

@@ -23,10 +23,11 @@ def pdf_changes(pdf_doc):
     db = Chroma.from_documents(texts, embeddings)
     retriever = db.as_retriever()
     global qa 
-    qa = ConversationalRetrievalChain.from_llm(
-        llm=OpenAI(temperature=0.5), 
-        retriever=retriever, 
-        return_source_documents=False)
+   qa = ConversationalRetrievalChain.from_llm(
+    llm=OpenAI(model="gpt-3.5-turbo-0613", temperature=0.5),  
+    retriever=retriever, 
+    return_source_documents=False)
+
     return "Ready"
 
 def add_text(history, text):