diff --git a/app/(chat)/api/chat/route.ts b/app/(chat)/api/chat/route.ts
index e59e631..13e4117 100644
--- a/app/(chat)/api/chat/route.ts
+++ b/app/(chat)/api/chat/route.ts
@@ -524,9 +524,30 @@ export async function POST(request: Request) {
     let smartAutoHistoryImages: string[] = [];         // 从历史对话中提取的图片URL（支持多张）
     let smartAutoNeedsClarification = false;           // 是否需要先追问用户
     let smartAutoClarificationQuestion: string | undefined;
+    let shouldRunAgentConversation = finalModelId === "auto";
+    let shouldKeepSelectedModel = false;
+    const requestedModelId = selectedChatModel;
+
+    if (!shouldRunAgentConversation && requestedModelId !== "auto") {
+      const selectedModelIsUUID =
+        /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i.test(
+          requestedModelId
+        );
+
+      if (selectedModelIsUUID) {
+        const selectedModelConfig = await getAiModelById({ id: requestedModelId });
+        if (selectedModelConfig?.supportsImageGen && !selectedModelConfig?.isSubModel) {
+          shouldRunAgentConversation = true;
+          shouldKeepSelectedModel = true;
+          console.log(
+            `[Smart Auto Mode] 🎯 Agent conversation enabled for fixed image model: ${selectedModelConfig.displayName}`
+          );
+        }
+      }
+    }
 
     // ========== Smart Auto Mode Logic ==========
-    if (finalModelId === "auto") {
+    if (shouldRunAgentConversation) {
       console.log("[Smart Auto Mode] 🚀 Starting intelligent analysis...");
       let autoTextForFallback = "";
       let autoHasImageForFallback = false;
@@ -698,9 +719,12 @@ export async function POST(request: Request) {
           });
         }
 
-        if (autoGraphResult.route) {
+        if (autoGraphResult.route && !shouldKeepSelectedModel) {
           finalModelId = autoGraphResult.route.id;
           console.log(`[Smart Auto Mode] ✅ Routed to: ${autoGraphResult.route.displayName} (${autoGraphResult.route.reason})`);
+        } else if (autoGraphResult.route && shouldKeepSelectedModel) {
+          finalModelId = requestedModelId;
+          console.log("[Smart Auto Mode] 🔒 Keep user-selected model, skip routing override");
         }
 
       } catch (autoError) {
@@ -737,7 +761,10 @@ export async function POST(request: Request) {
           bestModel = allModels.find(m => !m.model.isSubModel) || allModels[0];
         }
         
-        if (bestModel) {
+        if (shouldKeepSelectedModel) {
+          finalModelId = requestedModelId;
+          console.log("[Smart Auto Mode] 🔒 Keep user-selected model in fallback mode");
+        } else if (bestModel) {
           finalModelId = bestModel.model.id;
           console.log(`[Smart Auto Mode] Fallback selected: ${bestModel.model.displayName}`);
         } else {
@@ -858,7 +885,7 @@ export async function POST(request: Request) {
     const streamId = generateUUID();
     await createStreamId({ streamId, chatId: id });
 
-    if (selectedChatModel === "auto" && smartAutoNeedsClarification) {
+    if (shouldRunAgentConversation && smartAutoNeedsClarification) {
       const clarificationMessage =
         smartAutoClarificationQuestion ||
         smartAutoFriendlyMessage ||
diff --git a/components/canvas/CanvasChatPanel.tsx b/components/canvas/CanvasChatPanel.tsx
index d00d6e5..1ea191e 100644
--- a/components/canvas/CanvasChatPanel.tsx
+++ b/components/canvas/CanvasChatPanel.tsx
@@ -897,7 +897,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     const hiddenPrompt = hiddenSegments.join('\n\n').trim();
     hiddenPromptRef.current = hiddenPrompt || null;
     
-    const autoContext = selectedModelId === "auto" ? buildAutoContext() : "";
+    const autoContext = buildAutoContext();
     autoContextRef.current = autoContext ? autoContext : null;
     
     if (textContent) {