diff --git a/async-openai/src/types/chat.rs b/async-openai/src/types/chat.rs
index 68c93e19..5494d410 100644
--- a/async-openai/src/types/chat.rs
+++ b/async-openai/src/types/chat.rs
@@ -951,10 +951,15 @@ pub struct CreateChatCompletionResponse {
     pub system_fingerprint: Option<String>,
 
     /// The object type, which is always `chat.completion`.
+    #[serde(default="object_default_value")]
     pub object: String,
     pub usage: Option<CompletionUsage>,
 }
 
+pub fn object_default_value()->String{
+    "chat.completion".to_string()
+}
+
 /// Parsed server side events stream until an \[DONE\] is received from server.
 pub type ChatCompletionResponseStream =
     Pin<Box<dyn Stream<Item = Result<CreateChatCompletionStreamResponse, OpenAIError>> + Send>>;
diff --git a/async-openai/src/types/completion.rs b/async-openai/src/types/completion.rs
index 3c15dd6b..d1c5d68b 100644
--- a/async-openai/src/types/completion.rs
+++ b/async-openai/src/types/completion.rs
@@ -132,10 +132,15 @@ pub struct CreateCompletionResponse {
     pub system_fingerprint: Option<String>,
 
     /// The object type, which is always "text_completion"
+    #[serde(default="object_default_value")]
     pub object: String,
     pub usage: Option<CompletionUsage>,
 }
 
+pub fn object_default_value()->String{
+    "text_completion".to_string()
+}
+
 /// Parsed server side events stream until an \[DONE\] is received from server.
 pub type CompletionResponseStream =
     Pin<Box<dyn Stream<Item = Result<CreateCompletionResponse, OpenAIError>> + Send>>;
diff --git a/examples/gemini-openai-compatibility/src/gemini_types.rs b/examples/gemini-openai-compatibility/src/gemini_types.rs
index 6a245432..41400ee3 100644
--- a/examples/gemini-openai-compatibility/src/gemini_types.rs
+++ b/examples/gemini-openai-compatibility/src/gemini_types.rs
@@ -55,11 +55,16 @@ pub struct GeminiCreateChatCompletionResponse {
     /// The model used for the chat completion.
     pub model: String,
     /// The object type, which is always `chat.completion`.
+    #[serde(default="object_default_value")]
     pub object: String,
     /// usage statistics for the entire request.
     pub usage: Option<CompletionUsage>,
 }
 
+pub fn object_default_value()->String{
+    "chat.completion".to_string()
+}
+
 #[derive(Debug, Deserialize, Serialize, Clone, PartialEq)]
 pub struct GeminiImagesResponse {
     pub data: Vec<std::sync::Arc<Image>>,