diff --git a/components/multimodal-input.tsx b/components/multimodal-input.tsx
index a398c76..9410f0f 100644
--- a/components/multimodal-input.tsx
+++ b/components/multimodal-input.tsx
@@ -1098,18 +1098,16 @@ function PureModelSelectorCompact({
       onValueChange={(modelName) => {
         const model = displayModels.find((m) => m.displayName === modelName);
         if (model) {
-          // 如果选择的是"自动"，则智能选择一个真实模型
+          // 🆕 如果选择的是"自动"模式，直接传递 "auto" 给后端
+          // 后端会使用智能分析器进行意图识别和模型选择
           if (model.id === "auto") {
-            const bestModel = selectBestModel();
-            if (bestModel) {
-              console.log(`[自动选择] 根据${attachments.length > 0 ? '有附件' : '无附件'}情况，选择模型: ${bestModel.displayName}`);
-              setOptimisticModelId(bestModel.id);
-              onModelChange?.(bestModel.id);
-              startTransition(() => {
-                saveChatModelAsCookie(bestModel.id);
-              });
-              return;
-            }
+            console.log("[自动模式] 选择智能自动模式，后端将进行意图分析和模型路由");
+            setOptimisticModelId("auto");
+            onModelChange?.("auto");
+            startTransition(() => {
+              saveChatModelAsCookie("auto");
+            });
+            return;
           }
           
           setOptimisticModelId(model.id);