diff --git a/api/openai/chat.go b/api/openai/chat.go
index 8837c65c..cd0b82dd 100644
--- a/api/openai/chat.go
+++ b/api/openai/chat.go
@@ -81,7 +81,7 @@ func ChatEndpoint(cm *config.ConfigLoader, o *options.Option) func(c *fiber.Ctx)
 			noActionDescription = config.FunctionsConfig.NoActionDescriptionName
 		}
 
-		if input.ResponseFormat == "json_object" {
+		if input.ResponseFormat.Type == "json_object" {
 			input.Grammar = grammar.JSONBNF
 		}
 
diff --git a/api/openai/completion.go b/api/openai/completion.go
index fa7e6bac..da28d63c 100644
--- a/api/openai/completion.go
+++ b/api/openai/completion.go
@@ -65,7 +65,7 @@ func CompletionEndpoint(cm *config.ConfigLoader, o *options.Option) func(c *fibe
 			return fmt.Errorf("failed reading parameters from request:%w", err)
 		}
 
-		if input.ResponseFormat == "json_object" {
+		if input.ResponseFormat.Type == "json_object" {
 			input.Grammar = grammar.JSONBNF
 		}
 
diff --git a/api/openai/image.go b/api/openai/image.go
index 8243e167..2fe6c5a7 100644
--- a/api/openai/image.go
+++ b/api/openai/image.go
@@ -100,7 +100,7 @@ func ImageEndpoint(cm *config.ConfigLoader, o *options.Option) func(c *fiber.Ctx
 		}
 
 		b64JSON := false
-		if input.ResponseFormat == "b64_json" {
+		if input.ResponseFormat.Type == "b64_json" {
 			b64JSON = true
 		}
 		// src and clip_skip
diff --git a/api/schema/openai.go b/api/schema/openai.go
index 899f1b74..6355ff63 100644
--- a/api/schema/openai.go
+++ b/api/schema/openai.go
@@ -83,6 +83,12 @@ type OpenAIModel struct {
 	Object string `json:"object"`
 }
 
+type ChatCompletionResponseFormatType string
+
+type ChatCompletionResponseFormat struct {
+	Type ChatCompletionResponseFormatType `json:"type,omitempty"`
+}
+
 type OpenAIRequest struct {
 	config.PredictionOptions
 
@@ -92,7 +98,7 @@ type OpenAIRequest struct {
 	// whisper
 	File string `json:"file" validate:"required"`
 	//whisper/image
-	ResponseFormat string `json:"response_format"`
+	ResponseFormat ChatCompletionResponseFormat `json:"response_format"`
 	// image
 	Size string `json:"size"`
 	// Prompt is read only by completion/image API calls