diff --git a/samples/QuickstartClient/Program.cs b/samples/QuickstartClient/Program.cs
index cd1c4c60a..598f883ab 100644
--- a/samples/QuickstartClient/Program.cs
+++ b/samples/QuickstartClient/Program.cs
@@ -50,7 +50,7 @@
 var options = new ChatOptions
 {
     MaxOutputTokens = 1000,
-    ModelId = "claude-3-5-sonnet-20241022",
+    ModelId = "claude-haiku-4-5-20251001",
     Tools = [.. tools]
 };
 
@@ -121,4 +121,4 @@ static string GetCurrentSourceDirectory([CallerFilePath] string? currentFile = n
 {
     Debug.Assert(!string.IsNullOrWhiteSpace(currentFile));
     return Path.GetDirectoryName(currentFile) ?? throw new InvalidOperationException("Unable to determine source directory.");
-}
\ No newline at end of file
+}