changed cohere model

app.py

@@ -27,7 +27,7 @@ def respond(message, image, chat_history):
     try:
         # Generate response using Cohere
         stream = co.chat_stream(
-            model='command-r-plus-08-2024',
+            model='command-r7b-12-2024',
             message=f"{prompt} '{message_content}'",
             temperature=0.3,
             chat_history=[],  # Consider using chat_history for context