updated models to 4o-mini

src/streamlit_app.py

@@ -52,7 +52,7 @@ def generate_summary_from_text(text):
         {"role": "user", "content": prompt}
     ]
     completion = client.chat.completions.create(
-        model="gpt-5-nano",
+        model="gpt-4o-mini",
         messages=messages
     )
     return completion.choices[0].message.content.strip()
@@ -62,7 +62,7 @@ def chat_with_document(text, conversation_history, user_query):
         {"role": "user", "content": f"Based on the following document:\n\n{text}\n\nQuestion: {user_query}"}
     ]
     completion = client.chat.completions.create(
-        model="gpt-5-nano",
+        model="gpt-4o-mini",
         messages=messages
     )
     return completion.choices[0].message.content.strip()
@@ -77,7 +77,7 @@ def generate_questions_from_text(text, num_questions):
         {"role": "user", "content": prompt}
     ]
     completion = client.chat.completions.create(
-        model="gpt-5-nano",
+        model="gpt-4o-mini",
         messages=messages
     )
     return completion.choices[0].message.content.strip()
@@ -95,7 +95,7 @@ def generate_flashcards_from_text(text, num_cards):
         {"role": "user", "content": prompt}
     ]
     completion = client.chat.completions.create(
-        model="gpt-5-nano",
+        model="gpt-4o-mini",
         messages=messages
     )
     output = completion.choices[0].message.content.strip()