Update app.py

app.py

@@ -2193,14 +2193,14 @@ T4: final_answer_tool("3")
         # Initialize LLMs
         print("Initializing LLMs...")
 
-        # Primary: Gemini 2.5 Pro (15 RPM, unlimited TPM, 1500 RPD)
+        # Primary: Gemini 2.0 Flash (15 RPM, unlimited TPM, 1500 RPD)
         self.gemini_pro_llm = ChatGoogleGenerativeAI(
-            model="gemini-2.5-pro",
+            model="gemini-2.0-flash",
             google_api_key=GOOGLE_API_KEY,
             temperature=0,
             max_tokens=1024
         ).bind_tools(self.tools, tool_choice="auto")
-        print("✅ Gemini 2.5 Pro primary initialized")
+        print("✅ Gemini 2.0 Flash primary initialized")
 
         # Fallback 1: Gemini 2.5 Flash (5 RPM, 250K TPM, 20 RPD)
         self.gemini_flash_llm = ChatGoogleGenerativeAI(
@@ -2264,7 +2264,7 @@ T4: final_answer_tool("3")
             self.claude_llm = None
             print("ℹ️ Claude fallback unavailable (no ANTHROPIC_API_KEY)")
 
-        chain = "Gemini 2.5 Pro → Gemini 2.5 Flash"
+        chain = "Gemini 2.0 Flash → Gemini 2.5 Flash"
         if self.groq_llm:
             chain += " → Groq llama-3.3-70b → Groq qwen3-32b"
         if self.claude_llm: