diff --git a/src/Libraries/Microsoft.Extensions.AI.Abstractions/ChatCompletion/ChatCompletion.cs b/src/Libraries/Microsoft.Extensions.AI.Abstractions/ChatCompletion/ChatCompletion.cs
index 729483e7c30..0d3d28bd86b 100644
--- a/src/Libraries/Microsoft.Extensions.AI.Abstractions/ChatCompletion/ChatCompletion.cs
+++ b/src/Libraries/Microsoft.Extensions.AI.Abstractions/ChatCompletion/ChatCompletion.cs
@@ -42,6 +42,7 @@ public IList<ChatMessage> Choices
     /// If there are multiple choices, this property returns the first choice.
     /// If <see cref="Choices"/> is empty, this will throw. Use <see cref="Choices"/> to access all choices directly."/>.
     /// </remarks>
+    [JsonIgnore]
     public ChatMessage Message
     {
         get