diff --git a/examples/function_call.rs b/examples/function_call.rs
index ed83bb0..7cba333 100644
--- a/examples/function_call.rs
+++ b/examples/function_call.rs
@@ -50,21 +50,25 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     }])
     .function_call(FunctionCallType::Auto);
 
-    // debug reuqest json
+    // debug request json
     // let serialized = serde_json::to_string(&req).unwrap();
     // println!("{}", serialized);
 
     let result = client.chat_completion(req)?;
 
     match result.choices[0].finish_reason {
-        chat_completion::FinishReason::stop => {
+        None => {
+            println!("No finish_reason");
+            println!("{:?}", result.choices[0].message.content);
+        }
+        Some(chat_completion::FinishReason::stop) => {
             println!("Stop");
             println!("{:?}", result.choices[0].message.content);
         }
-        chat_completion::FinishReason::length => {
+        Some(chat_completion::FinishReason::length) => {
             println!("Length");
         }
-        chat_completion::FinishReason::function_call => {
+        Some(chat_completion::FinishReason::function_call) => {
             println!("FunctionCall");
             #[derive(Serialize, Deserialize)]
             struct Currency {
@@ -80,10 +84,10 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 println!("{} price: {}", coin, price);
             }
         }
-        chat_completion::FinishReason::content_filter => {
+        Some(chat_completion::FinishReason::content_filter) => {
             println!("ContentFilter");
         }
-        chat_completion::FinishReason::null => {
+        Some(chat_completion::FinishReason::null) => {
             println!("Null");
         }
     }
diff --git a/examples/function_call_role.rs b/examples/function_call_role.rs
index eeb2489..a842814 100644
--- a/examples/function_call_role.rs
+++ b/examples/function_call_role.rs
@@ -52,14 +52,18 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     let result = client.chat_completion(req)?;
 
     match result.choices[0].finish_reason {
-        chat_completion::FinishReason::stop => {
+        None => {
+            println!("No finish_reason");
+            println!("{:?}", result.choices[0].message.content);
+        }
+        Some(chat_completion::FinishReason::stop) => {
             println!("Stop");
             println!("{:?}", result.choices[0].message.content);
         }
-        chat_completion::FinishReason::length => {
+        Some(chat_completion::FinishReason::length) => {
             println!("Length");
         }
-        chat_completion::FinishReason::function_call => {
+        Some(chat_completion::FinishReason::function_call) => {
             println!("FunctionCall");
             #[derive(Serialize, Deserialize)]
             struct Currency {
@@ -94,10 +98,10 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             let result = client.chat_completion(req)?;
             println!("{:?}", result.choices[0].message.content);
         }
-        chat_completion::FinishReason::content_filter => {
+        Some(chat_completion::FinishReason::content_filter) => {
             println!("ContentFilter");
         }
-        chat_completion::FinishReason::null => {
+        Some(chat_completion::FinishReason::null) => {
             println!("Null");
         }
     }
diff --git a/src/v1/chat_completion.rs b/src/v1/chat_completion.rs
index b3d1708..909bada 100644
--- a/src/v1/chat_completion.rs
+++ b/src/v1/chat_completion.rs
@@ -119,7 +119,8 @@ pub struct ChatCompletionMessageForResponse {
 pub struct ChatCompletionChoice {
     pub index: i64,
     pub message: ChatCompletionMessageForResponse,
-    pub finish_reason: FinishReason,
+    pub finish_reason: Option<FinishReason>,
+    pub finish_details: Option<FinishDetails>,
 }
 
 #[derive(Debug, Deserialize)]
@@ -187,6 +188,13 @@ pub enum FinishReason {
     null,
 }
 
+#[derive(Debug, Serialize, Deserialize)]
+#[allow(non_camel_case_types)]
+pub struct FinishDetails {
+    pub r#type: FinishReason,
+    pub stop: String,
+}
+
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct FunctionCall {
     #[serde(skip_serializing_if = "Option::is_none")]