diff --git a/desktop/src/store/chat/conversationStore.ts b/desktop/src/store/chat/conversationStore.ts
index ff86e2a..5c15967 100644
--- a/desktop/src/store/chat/conversationStore.ts
+++ b/desktop/src/store/chat/conversationStore.ts
@@ -192,7 +192,7 @@ export const useConversationStore = create<ConversationState>()(
   agents: [DEFAULT_AGENT],
   currentAgent: DEFAULT_AGENT,
   sessionKey: null,
-  currentModel: 'glm-4-flash-250414',
+  currentModel: '',  // Set dynamically: SaaS models or config.toml default
 
   newConversation: (currentMessages: ChatMessage[]) => {
     const state = get();
diff --git a/desktop/src/store/saasStore.ts b/desktop/src/store/saasStore.ts
index 4d1212c..6bc0a11 100644
--- a/desktop/src/store/saasStore.ts
+++ b/desktop/src/store/saasStore.ts
@@ -467,6 +467,24 @@ export const useSaaSStore = create<SaaSStore>((set, get) => {
         saasClient.setBaseUrl(saasUrl);
         const models = await saasClient.listModels();
         set({ availableModels: models });
+
+        // Sync currentModel: if the stored model is not in the available list,
+        // switch to the first available model to prevent 404 errors
+        if (models.length > 0) {
+          try {
+            const { useConversationStore } = require('./chat/conversationStore');
+            const current = useConversationStore.getState().currentModel;
+            const modelIds = models.map(m => m.alias || m.id);
+            if (current && !modelIds.includes(current)) {
+              const firstModel = models[0];
+              const fallbackId = firstModel.alias || firstModel.id;
+              useConversationStore.getState().setCurrentModel(fallbackId);
+              log.info(`Synced currentModel: ${current} not available, switched to ${fallbackId}`);
+            }
+          } catch (syncErr) {
+            log.warn('Failed to sync currentModel after fetching models:', syncErr);
+          }
+        }
       } catch (err: unknown) {
         log.warn('Failed to fetch available models:', err);
         // Do not set error state - model fetch failure is non-critical