diff --git a/backend/internal/service/openai_gateway_service.go b/backend/internal/service/openai_gateway_service.go
index 1d5622e6..e4707455 100644
--- a/backend/internal/service/openai_gateway_service.go
+++ b/backend/internal/service/openai_gateway_service.go
@@ -1761,11 +1761,9 @@ func (s *OpenAIGatewayService) Forward(ctx context.Context, c *gin.Context, acco
 
 		// 移除 gpt-5.2-codex 以下的版本 verbosity 参数
 		// 确保高版本模型向低版本模型映射不报错
-		if !SupportsVerbosity(reqBody["model"].(string)) {
+		if !SupportsVerbosity(normalizedModel) {
 			if text, ok := reqBody["text"].(map[string]any); ok {
-				if _, ok := text["verbosity"].(string); ok {
-					delete(text, "verbosity")
-				}
+				delete(text, "verbosity")
 			}
 		}
 	}