Update app.py

app.py

@@ -27,7 +27,7 @@ GEMINI_API_KEY = os.environ.get("GEMINI_API_KEY")
 if GEMINI_API_KEY:
     genai.configure(api_key=GEMINI_API_KEY)
 
-ai_model = genai.GenerativeModel('gemini-2.5-pro')
+ai_model = genai.GenerativeModel('gemini-2.5-flash')
 
 def _truncate_to_words(text: str, limit: int) -> str:
     """Truncates text by word count."""
@@ -327,7 +327,10 @@ if st.button("Analyze and Compare Sources", use_container_width=True, type="prim
                     st.session_state.results_b = future_b.result()
                     st.session_state.nli_result = future_nli.result()
             except Exception as e:
-                st.error(f"API or Processing Error: {str(e)}")
+                if "429" in str(e) or "RESOURCE_EXHAUSTED" in str(e):
+                    st.error("**Rate Limit Reached:** Too many requests too quickly.")
+                else:
+                    st.error(f"API or Processing Error: {str(e)}")
                 st.session_state.results_a = None
                 st.session_state.results_b = None
                 st.session_state.nli_result = None