diff --git a/backend/api/openai_handlers.go b/backend/api/openai_handlers.go
index 2af18b3..bdcd198 100644
--- a/backend/api/openai_handlers.go
+++ b/backend/api/openai_handlers.go
@@ -73,6 +73,25 @@ func (h *APIHandler) ChatCompletions(c *gin.Context) {
 	modelName, _ := jsonBody["model"].(string)
 	isStream, _ := jsonBody["stream"].(bool)
 
+	// 处理 reasoning 字段，将对象转换为字符串
+	if messagesRaw, ok := jsonBody["messages"].([]interface{}); ok {
+		for _, msgRaw := range messagesRaw {
+			if msgMap, ok := msgRaw.(map[string]interface{}); ok {
+				if reasoning, exists := msgMap["reasoning"]; exists {
+					// 如果 reasoning 是对象，提取 content 字段作为字符串
+					if reasoningMap, ok := reasoning.(map[string]interface{}); ok {
+						if reasoningContent, ok := reasoningMap["content"].(string); ok {
+							msgMap["reasoning"] = reasoningContent
+						} else {
+							// 如果无法提取 content，移除 reasoning 字段
+							delete(msgMap, "reasoning")
+						}
+					}
+				}
+			}
+		}
+	}
+
 	// 提取 messages 并转换为计算 token 所需的格式
 	var messages []billing.ChatCompletionMessage
 	if messagesRaw, ok := jsonBody["messages"].([]interface{}); ok {
@@ -206,6 +225,25 @@ func (h *APIHandler) ResponsesCompletions(c *gin.Context) {
 	// 从 map 中提取需要的字段
 	modelName, _ := jsonBody["model"].(string)
 
+	// 处理 input 中的 reasoning 字段，将对象转换为字符串
+	if inputRaw, ok := jsonBody["input"].([]interface{}); ok {
+		for _, msgRaw := range inputRaw {
+			if msgMap, ok := msgRaw.(map[string]interface{}); ok {
+				if reasoning, exists := msgMap["reasoning"]; exists {
+					// 如果 reasoning 是对象，提取 content 字段作为字符串
+					if reasoningMap, ok := reasoning.(map[string]interface{}); ok {
+						if reasoningContent, ok := reasoningMap["content"].(string); ok {
+							msgMap["reasoning"] = reasoningContent
+						} else {
+							// 如果无法提取 content，移除 reasoning 字段
+							delete(msgMap, "reasoning")
+						}
+					}
+				}
+			}
+		}
+	}
+
 	// 提取 input 并转换为计算 token 所需的格式
 	var messages []billing.ChatCompletionMessage
 	if inputRaw, ok := jsonBody["input"].([]interface{}); ok {