diff --git a/openai/openai.go b/openai/openai.go
index b25ba0949..daafabcee 100644
--- a/openai/openai.go
+++ b/openai/openai.go
@@ -67,14 +67,14 @@ type Usage struct {
 // is requested to follow OpenAI's behavior.
 type ChunkUsage = Usage
 
-var nullChunkUsage = ChunkUsage{}
+// var nullChunkUsage = ChunkUsage{}
 
-func (u *ChunkUsage) MarshalJSON() ([]byte, error) {
-	if u == &nullChunkUsage {
-		return []byte("null"), nil
-	}
-	return json.Marshal(*u)
-}
+// func (u *ChunkUsage) MarshalJSON() ([]byte, error) {
+// 	if u == &nullChunkUsage {
+// 		return []byte("null"), nil
+// 	}
+// 	return json.Marshal(*u)
+// }
 
 type ResponseFormat struct {
 	Type       string      `json:"type"`
@@ -601,16 +601,16 @@ type BaseWriter struct {
 }
 
 type ChatWriter struct {
-	stream      bool
-	streamUsage bool
-	id          string
+	stream        bool
+	streamOptions *StreamOptions
+	id            string
 	BaseWriter
 }
 
 type CompleteWriter struct {
-	stream      bool
-	streamUsage bool
-	id          string
+	stream        bool
+	streamOptions *StreamOptions
+	id            string
 	BaseWriter
 }
 
@@ -654,8 +654,8 @@ func (w *ChatWriter) writeResponse(data []byte) (int, error) {
 	// chat chunk
 	if w.stream {
 		c := toChunk(w.id, chatResponse)
-		if w.streamUsage {
-			c.Usage = &nullChunkUsage
+		if w.streamOptions != nil && w.streamOptions.IncludeUsage {
+			c.Usage = &ChunkUsage{}
 		}
 		d, err := json.Marshal(c)
 		if err != nil {
@@ -669,7 +669,7 @@ func (w *ChatWriter) writeResponse(data []byte) (int, error) {
 		}
 
 		if chatResponse.Done {
-			if w.streamUsage {
+			if w.streamOptions != nil && w.streamOptions.IncludeUsage {
 				u := toUsage(chatResponse)
 				d, err := json.Marshal(ChatCompletionChunk{Choices: []ChunkChoice{}, Usage: &u})
 				if err != nil {
@@ -718,8 +718,8 @@ func (w *CompleteWriter) writeResponse(data []byte) (int, error) {
 	// completion chunk
 	if w.stream {
 		c := toCompleteChunk(w.id, generateResponse)
-		if w.streamUsage {
-			c.Usage = &nullChunkUsage
+		if w.streamOptions != nil && w.streamOptions.IncludeUsage {
+			c.Usage = &ChunkUsage{}
 		}
 		d, err := json.Marshal(c)
 		if err != nil {
@@ -733,7 +733,7 @@ func (w *CompleteWriter) writeResponse(data []byte) (int, error) {
 		}
 
 		if generateResponse.Done {
-			if w.streamUsage {
+			if w.streamOptions != nil && w.streamOptions.IncludeUsage {
 				u := toUsageGenerate(generateResponse)
 				d, err := json.Marshal(CompletionChunk{Choices: []CompleteChunkChoice{}, Usage: &u})
 				if err != nil {
@@ -906,10 +906,10 @@ func CompletionsMiddleware() gin.HandlerFunc {
 		c.Request.Body = io.NopCloser(&b)
 
 		w := &CompleteWriter{
-			BaseWriter:  BaseWriter{ResponseWriter: c.Writer},
-			stream:      req.Stream,
-			id:          fmt.Sprintf("cmpl-%d", rand.Intn(999)),
-			streamUsage: req.StreamOptions != nil && req.StreamOptions.IncludeUsage,
+			BaseWriter:    BaseWriter{ResponseWriter: c.Writer},
+			stream:        req.Stream,
+			id:            fmt.Sprintf("cmpl-%d", rand.Intn(999)),
+			streamOptions: req.StreamOptions,
 		}
 
 		c.Writer = w
@@ -989,10 +989,10 @@ func ChatMiddleware() gin.HandlerFunc {
 		c.Request.Body = io.NopCloser(&b)
 
 		w := &ChatWriter{
-			BaseWriter:  BaseWriter{ResponseWriter: c.Writer},
-			stream:      req.Stream,
-			id:          fmt.Sprintf("chatcmpl-%d", rand.Intn(999)),
-			streamUsage: req.StreamOptions != nil && req.StreamOptions.IncludeUsage,
+			BaseWriter:    BaseWriter{ResponseWriter: c.Writer},
+			stream:        req.Stream,
+			id:            fmt.Sprintf("chatcmpl-%d", rand.Intn(999)),
+			streamOptions: req.StreamOptions,
 		}
 
 		c.Writer = w