diff --git a/examples/quick_start.py b/examples/quick_start.py
index 0fb91d8..37d93b0 100644
--- a/examples/quick_start.py
+++ b/examples/quick_start.py
@@ -60,8 +60,8 @@ async def with_tools_example():
             for block in message.content:
                 if isinstance(block, TextBlock):
                     print(f"Claude: {block.text}")
-        elif isinstance(message, ResultMessage) and message.cost_usd > 0:
-            print(f"\nCost: ${message.cost_usd:.4f}")
+        elif isinstance(message, ResultMessage) and message.total_cost_usd > 0:
+            print(f"\nCost: ${message.total_cost_usd:.4f}")
     print()