diff --git a/components/canvas/CanvasChatPanel.tsx b/components/canvas/CanvasChatPanel.tsx
index 9d7d5bdb4..e969f0949 100644
--- a/components/canvas/CanvasChatPanel.tsx
+++ b/components/canvas/CanvasChatPanel.tsx
@@ -1181,6 +1181,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
   const hiddenPromptRef = useRef<string | null>(null);
   const autoContextRef = useRef<string | null>(null);
   const pendingLaunchRef = useRef<CanvasLaunchPayload | null>(null);
+  const [launchAutoSendTick, setLaunchAutoSendTick] = useState(0);
   const sessionMenuRef = useRef<HTMLDivElement>(null);
   const historyScrollTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
   
@@ -1679,6 +1680,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
           selectedModelId: parsed.selectedModelId,
           imageParams: parsed.imageParams,
         };
+        setLaunchAutoSendTick((value) => value + 1);
       }
 
       normalizedAttachments.forEach(async (attachment, index) => {
@@ -2614,7 +2616,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     if (editableDiv) {
       editableDiv.innerHTML = "";
     }
-  }, [selectedModelId, status, sendMessage, clearSelection]);
+  }, [selectedModelId, status, sendMessage, clearSelection, launchAutoSendTick]);
   
   // 当历史消息加载完成后，更新消息列表（支持同一会话的增量刷新）
   const loadedHistorySignatureRef = useRef<string>("");
diff --git a/components/home/lovart-home.tsx b/components/home/lovart-home.tsx
index ec5aa12b5..bb432904a 100644
--- a/components/home/lovart-home.tsx
+++ b/components/home/lovart-home.tsx
@@ -343,7 +343,6 @@ export function LovartHome({
   const [usageFilter, setUsageFilter] = useState<"all" | "consumed" | "earned">("all");
   const [billingCycle, setBillingCycle] = useState<"monthly" | "annual">("monthly");
   const [creatingPaymentPackageId, setCreatingPaymentPackageId] = useState<string | null>(null);
-  const [selectedModelId, setSelectedModelId] = useState<string>("");
   const [imageParams, setImageParams] = useState<ImageGenerationParams>({
     aspectRatio: "auto",
     imageSize: "2K",
@@ -457,11 +456,6 @@ export function LovartHome({
   const membershipPlans = membershipConfig?.plans || [];
   const currentPlan = membershipData?.currentPlan;
 
-  const imageModels = useMemo(
-    () => (modelsData?.models || []).filter((model) => model.supportsImageGen),
-    [modelsData?.models]
-  );
-
   const autoComposerModel = useMemo<ModelOption>(
     () => ({
       id: "auto",
@@ -475,24 +469,8 @@ export function LovartHome({
     [modelsData?.agentModel?.avatarUrl, modelsData?.agentModel?.imageGenConfig]
   );
 
-  const allComposerModels = useMemo<ModelOption[]>(
-    () => [autoComposerModel, ...imageModels],
-    [autoComposerModel, imageModels]
-  );
-
-  const composerModelValue = useMemo(() => {
-    if (!selectedModelId) return "auto";
-    if (allComposerModels.some((model) => model.id === selectedModelId)) {
-      return selectedModelId;
-    }
-    return "auto";
-  }, [allComposerModels, selectedModelId]);
-  const triggerComposerModel = useMemo(
-    () =>
-      allComposerModels.find((model) => model.id === composerModelValue) ||
-      allComposerModels.find((model) => model.id === "auto"),
-    [allComposerModels, composerModelValue]
-  );
+  const composerModelValue = "auto";
+  const triggerComposerModel = autoComposerModel;
   const isMembershipEnabled = siteSettingsData?.membershipConfig?.enabled !== false;
 
   const discoveryTabs = useMemo(() => {
@@ -682,19 +660,6 @@ export function LovartHome({
     window.location.replace("/");
   };
 
-  useEffect(() => {
-    if (selectedModelId) return;
-    const defaultModelId = siteSettingsData?.canvasDefaultModelId || "auto";
-    setSelectedModelId(defaultModelId);
-  }, [selectedModelId, siteSettingsData?.canvasDefaultModelId]);
-
-  useEffect(() => {
-    if (!selectedModelId) return;
-    if (allComposerModels.length === 0) return;
-    if (allComposerModels.some((model) => model.id === selectedModelId)) return;
-    setSelectedModelId("auto");
-  }, [allComposerModels, selectedModelId]);
-
   useEffect(() => {
     if (!isAuthenticated) return;
     setLoginDialogOpen(false);
@@ -1078,7 +1043,7 @@ export function LovartHome({
             attachments: uploadedAttachments,
             autoSend: true,
             createdAt: Date.now(),
-            selectedModelId: composerModelValue,
+            selectedModelId: "auto",
             imageParams,
           })
         );
@@ -1665,57 +1630,24 @@ export function LovartHome({
                   />
                 </label>
 
-                <Select value={composerModelValue} onValueChange={setSelectedModelId}>
-                  <SelectTrigger className="h-8 w-auto min-w-[130px] rounded-full border border-blue-100 bg-blue-50 px-2 text-xs text-blue-600">
-                    <div className="flex min-w-0 items-center gap-1.5">
-                      <span className="h-5 w-5 overflow-hidden rounded-full border border-blue-200 bg-white">
-                        {triggerComposerModel?.avatarUrl ? (
-                          <img
-                            src={triggerComposerModel.avatarUrl}
-                            alt={triggerComposerModel.displayName || "模型头像"}
-                            className="h-full w-full object-cover"
-                          />
-                        ) : (
-                          <span className="flex h-full w-full items-center justify-center text-[10px] font-medium text-blue-500">
-                            {(triggerComposerModel?.displayName || "A").slice(0, 1)}
-                          </span>
-                        )}
+                <div className="inline-flex h-8 min-w-[130px] items-center gap-1.5 rounded-full border border-blue-100 bg-blue-50 px-2 text-xs text-blue-600">
+                  <span className="h-5 w-5 overflow-hidden rounded-full border border-blue-200 bg-white">
+                    {triggerComposerModel?.avatarUrl ? (
+                      <img
+                        src={triggerComposerModel.avatarUrl}
+                        alt={triggerComposerModel.displayName || "模型头像"}
+                        className="h-full w-full object-cover"
+                      />
+                    ) : (
+                      <span className="flex h-full w-full items-center justify-center text-[10px] font-medium text-blue-500">
+                        {(triggerComposerModel?.displayName || "A").slice(0, 1)}
                       </span>
-                      <span className="max-w-[95px] truncate">
-                        {triggerComposerModel?.displayName || "Agent模式"}
-                      </span>
-                    </div>
-                  </SelectTrigger>
-                  <SelectContent className="w-[238px] max-h-[340px] overflow-hidden rounded-[18px] border border-[#cfd4dc] bg-[#f3f4f6]/90 p-1.5 shadow-[0_8px_20px_rgba(15,23,42,0.13)]">
-                    <div className="max-h-[312px] space-y-0.5 overflow-y-auto pr-1">
-                      {allComposerModels.map((model) => (
-                        <SelectItem
-                          key={model.id}
-                          value={model.id}
-                          className="h-[34px] rounded-xl px-2.5 text-[#2f3640] [&>span:first-child]:hidden [&>span:last-child]:block [&>span:last-child]:w-full focus:bg-[#e7ebf0] focus:text-[#1f2937] data-[state=checked]:bg-[#e7ebf0] data-[state=checked]:text-[#1f2937]"
-                        >
-                          <span className="flex w-full items-center justify-between gap-2">
-                            <span className="flex min-w-0 items-center gap-2">
-                              <span className="h-5 w-5 overflow-hidden rounded-full border border-[#d4d9df] bg-white">
-                                {model.avatarUrl ? (
-                                  <img src={model.avatarUrl} alt={model.displayName} className="h-full w-full object-cover" />
-                                ) : (
-                                  <span className="flex h-full w-full items-center justify-center text-[9px] font-medium text-[#6b7280]">
-                                    {model.id === "auto" ? "A" : model.displayName.slice(0, 1)}
-                                  </span>
-                                )}
-                              </span>
-                              <span className="truncate text-[12px] font-medium leading-none">{model.displayName}</span>
-                            </span>
-                            {composerModelValue === model.id ? (
-                              <span className="text-sm font-semibold text-[#1f2937]">✓</span>
-                            ) : null}
-                          </span>
-                        </SelectItem>
-                      ))}
-                    </div>
-                  </SelectContent>
-                </Select>
+                    )}
+                  </span>
+                  <span className="max-w-[95px] truncate">
+                    {triggerComposerModel?.displayName || "Agent模式"}
+                  </span>
+                </div>
 
                 <div className="min-w-0 flex-1 overflow-hidden">
                   <ImageParamsBar