Update app.py

Feat: use gpt-4o-mini

app.py

@@ -56,7 +56,7 @@ def save_uploaded_file(uploaded_file):
 
 def summarize_pdf(pdf_file_path, num_clusters=10):
     embeddings_model = OpenAIEmbeddings(model="text-embedding-3-small", api_key=openai_api_key)
-    llm = ChatOpenAI(model="gpt-3.5-turbo", api_key=openai_api_key, temperature=0.3)
+    llm = ChatOpenAI(model="gpt-4o-mini", api_key=openai_api_key, temperature=0.3)
     prompt = ChatPromptTemplate.from_template(
         """Could you please provide a concise and comprehensive summary of the given Contexts? 
         The summary should capture the main points and key details of the text while conveying the author's intended meaning accurately. 
@@ -89,7 +89,7 @@ def summarize_pdf(pdf_file_path, num_clusters=10):
 
 def qa_pdf(pdf_file_path, query, num_clusters=5, similarity_threshold=0.6):
     embeddings_model = OpenAIEmbeddings(model="text-embedding-3-small", api_key=openai_api_key)
-    llm = ChatOpenAI(model="gpt-3.5-turbo", api_key=openai_api_key, temperature=0.3)
+    llm = ChatOpenAI(model="gpt-4o-mini", api_key=openai_api_key, temperature=0.3)
     prompt = ChatPromptTemplate.from_template(
         """Please provide a detailed and accurate answer to the given question based on the provided contexts. 
         Ensure that the answer is comprehensive and directly addresses the query.