diff --git a/Source/OpenAI/DataTypes.cs b/Source/OpenAI/DataTypes.cs
index ec3b275..135e9f9 100644
--- a/Source/OpenAI/DataTypes.cs
+++ b/Source/OpenAI/DataTypes.cs
@@ -102,6 +102,7 @@ public struct CreateChatCompletionResponse : IResponse
 		public long Created { get; set; }
 		public List<ChatChoice> Choices { get; set; }
 		public Usage Usage { get; set; }
+		public string SystemFingerprint { get; set; }
 	}
 
 	public struct ChatChoice