diff --git a/app/(chat)/api/chat/route.ts b/app/(chat)/api/chat/route.ts
index 5c3f8a432..877729843 100644
--- a/app/(chat)/api/chat/route.ts
+++ b/app/(chat)/api/chat/route.ts
@@ -1922,7 +1922,12 @@ export async function POST(request: Request) {
         // 简单回退：有图选图片模型，无图选默认模型
         let bestModel = null;
         if (hasImage) {
-          bestModel = allModels.find(m => m.model.supportsImageGen && !m.model.isSubModel);
+          bestModel = allModels.find(
+            (m) =>
+              m.model.supportsImageGen &&
+              !m.model.isSubModel &&
+              !isVideoProviderType(m.provider?.type),
+          );
           if (isAutoTimeout) {
               smartAutoFriendlyMessage = buildAutoModeFallbackMessage({
                 text: autoTextForFallback,
@@ -1948,10 +1953,14 @@ export async function POST(request: Request) {
           });
         }
         if (!bestModel) {
-          bestModel = allModels.find(m => m.model.isDefault && !m.model.isSubModel);
+          bestModel = allModels.find(
+            (m) => m.model.isDefault && !m.model.isSubModel && !isVideoProviderType(m.provider?.type),
+          );
         }
         if (!bestModel && allModels.length > 0) {
-          bestModel = allModels.find(m => !m.model.isSubModel) || allModels[0];
+          bestModel = allModels.find(
+            (m) => !m.model.isSubModel && !isVideoProviderType(m.provider?.type),
+          ) || allModels.find((m) => !m.model.isSubModel) || allModels[0];
         }
         
         if (shouldKeepSelectedModel) {
@@ -1967,6 +1976,50 @@ export async function POST(request: Request) {
     }
     // ========== End Smart Auto Mode Logic ==========
 
+    if (shouldRunAgentConversation && !allowAgentVideoGeneration) {
+      const finalModelIsUuid =
+        /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i.test(finalModelId);
+      let finalProviderType: string | undefined;
+
+      if (finalModelIsUuid) {
+        const finalModelConfig = await getAiModelById({ id: finalModelId }).catch(() => null);
+        if (finalModelConfig) {
+          finalProviderType = (
+            await getAiProviderById({ id: finalModelConfig.providerId }).catch(() => null)
+          )?.type as string | undefined;
+        }
+      }
+
+      if (isVideoProviderType(finalProviderType)) {
+        const allModels = await getEnabledAiModelsWithProvider(false);
+        const fallbackModel =
+          allModels.find(
+            (m) =>
+              !m.model.isSubModel &&
+              m.model.supportsImageGen &&
+              !isVideoProviderType(m.provider?.type),
+          ) ||
+          allModels.find(
+            (m) =>
+              !m.model.isSubModel &&
+              !isVideoProviderType(m.provider?.type),
+          );
+
+        if (fallbackModel) {
+          const hasImageInput = message.parts.some((part: any) =>
+            part?.type === "file" || part?.type === "image" || part?.type === "image_url"
+          );
+          smartAutoDetectedIntent = hasImageInput ? "image_edit" : "image_gen";
+          finalModelId = fallbackModel.model.id;
+          smartAutoVideoPlan = undefined;
+          smartAutoRecommendedVideoParams = undefined;
+          console.log(
+            `[Smart Auto Mode] 🚫 Safety override: replace video model (${finalProviderType}) with ${fallbackModel.model.displayName}`,
+          );
+        }
+      }
+    }
+
     if (
       shouldRunAgentConversation &&
       !smartAutoNeedsClarification &&