diff --git a/api_chat_completions.go b/api_chat_completions.go
index 9259e63..e4249a2 100644
--- a/api_chat_completions.go
+++ b/api_chat_completions.go
@@ -39,20 +39,25 @@ type ChatCompletionsMessage struct {
 }
 
 type ChatCompletionsRequest struct {
-	Messages         []*ChatCompletionsMessage `json:"messages"`
-	Model            ChatCompletionsModelID    `json:"model"`
-	MaxTokens        int                       `json:"max_tokens"`
-	Temperature      float64                   `json:"temperature"`
-	TopP             float64                   `json:"top_p"`
-	N                int                       `json:"n"`
-	PresencePenalty  float64                   `json:"presence_penalty"`
-	FrequencyPenalty float64                   `json:"frequency_penalty"`
-	Stop             []string                  `json:"stop"`
-	Stream           bool                      `json:"stream"`
+	Messages         []*ChatCompletionsMessage             `json:"messages"`
+	Model            ChatCompletionsModelID                `json:"model"`
+	MaxTokens        int                                   `json:"max_tokens"`
+	Temperature      float64                               `json:"temperature"`
+	TopP             float64                               `json:"top_p"`
+	N                int                                   `json:"n"`
+	PresencePenalty  float64                               `json:"presence_penalty"`
+	FrequencyPenalty float64                               `json:"frequency_penalty"`
+	ResponseFormat   *ChatCompletionsRequestResponseFormat `json:"response_format"`
+	Stop             []string                              `json:"stop"`
+	Stream           bool                                  `json:"stream"`
 	// When you use a tool, you need to define it
 	Tools []*ChatCompletionsTool `json:"tools,omitempty"`
 }
 
+type ChatCompletionsRequestResponseFormat struct {
+	Type ChatCompletionsResponseFormatType `json:"type"`
+}
+
 type ChatCompletionsResponse struct {
 	ID      string                            `json:"id"`
 	Object  string                            `json:"object"`
@@ -162,7 +167,7 @@ func (c *ChatCompletionsStreamResponse) Receive() <-chan *ChatCompletionsStreamR
 		for {
 			line, err := reader.ReadBytes('\n')
 			rr := ChatCompletionsStreamResponseReceive{}
-			//slog.Debug("next line", string(line))
+			// slog.Debug("next line", string(line))
 			if err != nil {
 				if err == io.EOF {
 					c.sendWithFinish(receiveCh)
@@ -175,7 +180,7 @@ func (c *ChatCompletionsStreamResponse) Receive() <-chan *ChatCompletionsStreamR
 			prefix := []byte("data: ")
 
 			if !bytes.HasPrefix(line, prefix) {
-				//slog.Debug("no hava prefix,continue", slog.String("line", string(line)))
+				// slog.Debug("no hava prefix,continue", slog.String("line", string(line)))
 				continue
 			}
 
diff --git a/chat_completions_builder.go b/chat_completions_builder.go
index b99b52f..08a058a 100644
--- a/chat_completions_builder.go
+++ b/chat_completions_builder.go
@@ -21,6 +21,7 @@ type IChatCompletionsBuilder interface {
 	SetTool(tool *ChatCompletionsTool) IChatCompletionsBuilder
 	SetTools(tools []*ChatCompletionsTool) IChatCompletionsBuilder
 	SetContextCacheContent(content *ContextCacheContent) IChatCompletionsBuilder
+	SetResponseFormat(format ChatCompletionsResponseFormatType) IChatCompletionsBuilder
 
 	ToRequest() *ChatCompletionsRequest
 }
@@ -214,6 +215,13 @@ func (c *chatCompletionsBuilder) SetContextCacheContent(content *ContextCacheCon
 	return c
 }
 
+func (c *chatCompletionsBuilder) SetResponseFormat(format ChatCompletionsResponseFormatType) IChatCompletionsBuilder {
+	c.req.ResponseFormat = &ChatCompletionsRequestResponseFormat{
+		Type: format,
+	}
+	return c
+}
+
 // ToRequest returns the ChatCompletionsRequest
 func (c *chatCompletionsBuilder) ToRequest() *ChatCompletionsRequest {
 	return c.req
diff --git a/chat_completions_builder_test.go b/chat_completions_builder_test.go
index cd9b053..d406273 100644
--- a/chat_completions_builder_test.go
+++ b/chat_completions_builder_test.go
@@ -3,8 +3,9 @@ package moonshot_test
 import (
 	"testing"
 
-	"github.com/northes/go-moonshot"
 	"github.com/stretchr/testify/require"
+
+	"github.com/northes/go-moonshot"
 )
 
 func TestNewChatCompletionsBuilder(t *testing.T) {
@@ -21,7 +22,7 @@ func TestNewChatCompletionsBuilder(t *testing.T) {
 		functionName2    = "function2"
 	)
 
-	wantedReq := &moonshot.ChatCompletionsRequest{
+	var wantedReq = &moonshot.ChatCompletionsRequest{
 		Messages: []*moonshot.ChatCompletionsMessage{
 			{
 				Role:    moonshot.RoleContextCache,
@@ -51,8 +52,11 @@ func TestNewChatCompletionsBuilder(t *testing.T) {
 		N:                1,
 		PresencePenalty:  1.2,
 		FrequencyPenalty: 1.5,
-		Stop:             []string{"结束"},
-		Stream:           true,
+		ResponseFormat: &moonshot.ChatCompletionsRequestResponseFormat{
+			Type: moonshot.ChatCompletionsResponseFormatJSONObject,
+		},
+		Stop:   []string{"结束"},
+		Stream: true,
 		Tools: []*moonshot.ChatCompletionsTool{{
 			Type: moonshot.ChatCompletionsToolTypeFunction,
 			Function: &moonshot.ChatCompletionsToolFunction{
@@ -91,6 +95,7 @@ func TestNewChatCompletionsBuilder(t *testing.T) {
 		SetN(1).
 		SetPresencePenalty(1.2).
 		SetFrequencyPenalty(1.5).
+		SetResponseFormat(moonshot.ChatCompletionsResponseFormatJSONObject).
 		SetStop([]string{"结束"}).
 		SetStream(true).
 		SetTool(&moonshot.ChatCompletionsTool{
@@ -126,4 +131,7 @@ func TestNewChatCompletionsBuilder(t *testing.T) {
 
 	builder2.SetPresencePenalty(2)
 	tt.NotEqual(wantedReq, builder2.ToRequest())
+
+	builder2.SetResponseFormat(moonshot.ChatCompletionsResponseFormatText)
+	tt.NotEqual(wantedReq, builder2.ToRequest())
 }
diff --git a/enum_chat_completions.go b/enum_chat_completions.go
index 21fff69..fd34756 100644
--- a/enum_chat_completions.go
+++ b/enum_chat_completions.go
@@ -67,3 +67,14 @@ const (
 func (c ChatCompletionsParametersType) String() string {
 	return string(c)
 }
+
+type ChatCompletionsResponseFormatType string
+
+const (
+	ChatCompletionsResponseFormatJSONObject ChatCompletionsResponseFormatType = "json_object"
+	ChatCompletionsResponseFormatText       ChatCompletionsResponseFormatType = "text"
+)
+
+func (c ChatCompletionsResponseFormatType) String() string {
+	return string(c)
+}
diff --git a/enum_chat_completions_test.go b/enum_chat_completions_test.go
index b31232f..32d953a 100644
--- a/enum_chat_completions_test.go
+++ b/enum_chat_completions_test.go
@@ -3,8 +3,9 @@ package moonshot_test
 import (
 	"testing"
 
-	"github.com/northes/go-moonshot"
 	"github.com/stretchr/testify/require"
+
+	"github.com/northes/go-moonshot"
 )
 
 func TestEnumChatCompletions(t *testing.T) {
@@ -25,4 +26,7 @@ func TestEnumChatCompletions(t *testing.T) {
 	tt.EqualValues(moonshot.ChatCompletionsToolTypeFunction, moonshot.ChatCompletionsToolTypeFunction.String())
 
 	tt.EqualValues(moonshot.ChatCompletionsParametersTypeObject, moonshot.ChatCompletionsParametersTypeObject.String())
+
+	tt.EqualValues(moonshot.ChatCompletionsResponseFormatJSONObject, moonshot.ChatCompletionsResponseFormatJSONObject.String())
+	tt.EqualValues(moonshot.ChatCompletionsResponseFormatText, moonshot.ChatCompletionsResponseFormatText.String())
 }