diff --git a/router/src/lib.rs b/router/src/lib.rs
index 126726c6a58..e198b4139e9 100644
--- a/router/src/lib.rs
+++ b/router/src/lib.rs
@@ -420,10 +420,11 @@ pub struct CompletionRequest {
     pub stop: Option<Vec<String>>,
 }
 
-#[derive(Clone, Deserialize, Serialize, ToSchema, Default)]
+#[derive(Clone, Deserialize, Serialize, ToSchema)]
 pub(crate) struct Completion {
     pub id: String,
-    pub object: String,
+    #[schema(default = "ObjectType::ChatCompletion")]
+    pub object: ObjectType,
     #[schema(example = "1706270835")]
     pub created: u64,
     #[schema(example = "mistralai/Mistral-7B-Instruct-v0.2")]
@@ -444,7 +445,7 @@ pub(crate) struct CompletionComplete {
 #[derive(Clone, Deserialize, Serialize, ToSchema)]
 pub(crate) struct ChatCompletion {
     pub id: String,
-    pub object: String,
+    pub object: ObjectType,
     #[schema(example = "1706270835")]
     pub created: u64,
     #[schema(example = "mistralai/Mistral-7B-Instruct-v0.2")]
@@ -540,6 +541,14 @@ pub(crate) struct Usage {
     pub total_tokens: u32,
 }
 
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub enum ObjectType {
+    #[serde(rename = "chat.completion")]
+    ChatCompletion,
+    #[serde(rename = "chat.completion.chunk")]
+    ChatCompletionChunk,
+}
+
 impl ChatCompletion {
     pub(crate) fn new(
         model: String,
@@ -576,7 +585,7 @@ impl ChatCompletion {
         };
         Self {
             id: String::new(),
-            object: "chat.completion".into(),
+            object: ObjectType::ChatCompletion,
             created,
             model,
             system_fingerprint,
@@ -598,7 +607,7 @@ impl ChatCompletion {
 #[derive(Clone, Deserialize, Serialize, ToSchema)]
 pub(crate) struct CompletionCompleteChunk {
     pub id: String,
-    pub object: String,
+    pub object: ObjectType,
     pub created: u64,
     pub choices: Vec<CompletionComplete>,
     pub model: String,
@@ -608,7 +617,7 @@ pub(crate) struct CompletionCompleteChunk {
 #[derive(Clone, Serialize, ToSchema)]
 pub(crate) struct ChatCompletionChunk {
     pub id: String,
-    pub object: String,
+    pub object: ObjectType,
     #[schema(example = "1706270978")]
     pub created: u64,
     #[schema(example = "mistralai/Mistral-7B-Instruct-v0.2")]
@@ -688,7 +697,7 @@ impl ChatCompletionChunk {
         };
         Self {
             id: String::new(),
-            object: "chat.completion.chunk".to_string(),
+            object: ObjectType::ChatCompletionChunk,
             created,
             model,
             system_fingerprint,
diff --git a/router/src/server.rs b/router/src/server.rs
index 7f15bfdd6a6..d20785b6352 100644
--- a/router/src/server.rs
+++ b/router/src/server.rs
@@ -13,8 +13,8 @@ use crate::validation::ValidationError;
 use crate::{
     BestOfSequence, Details, ErrorResponse, FinishReason, GenerateParameters, GenerateRequest,
     GenerateResponse, GrammarType, HubModelInfo, HubProcessorConfig, HubTokenizerConfig, Info,
-    Message, PrefillToken, SimpleToken, StreamDetails, StreamResponse, Token, TokenizeResponse,
-    Usage, Validation,
+    Message, ObjectType, PrefillToken, SimpleToken, StreamDetails, StreamResponse, Token,
+    TokenizeResponse, Usage, Validation,
 };
 use crate::{
     ChatCompletion, ChatCompletionChoice, ChatCompletionChunk, ChatCompletionComplete,
@@ -705,7 +705,7 @@ async fn completions(
                     event
                         .json_data(CompletionCompleteChunk {
                             id: "".to_string(),
-                            object: "text_completion".to_string(),
+                            object: ObjectType::ChatCompletionChunk,
                             created: current_time,
 
                             choices: vec![CompletionComplete {
@@ -932,7 +932,7 @@ async fn completions(
 
         let response = Completion {
             id: "".to_string(),
-            object: "text_completion".to_string(),
+            object: ObjectType::ChatCompletion,
             created: current_time,
             model: info.model_id.clone(),
             system_fingerprint: format!(