diff --git a/src/components/chat/GlobalChatbox.tsx b/src/components/chat/GlobalChatbox.tsx
index 7871814..a6b0e8d 100644
--- a/src/components/chat/GlobalChatbox.tsx
+++ b/src/components/chat/GlobalChatbox.tsx
@@ -29,7 +29,7 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
   const [isHistoryOpen, setIsHistoryOpen] = useState(false);
   const [isCheckingAuth, setIsCheckingAuth] = useState(false);
   const [selectedModel, setSelectedModel] = useState<AgentModel>(
-    "deepseek/deepseek-v4-pro",
+    "deepseek/deepseek-v4-flash",
   );
   const [approvalMode, setApprovalMode] =
     useState<AgentApprovalMode>("request");
diff --git a/src/lib/chatStream.test.ts b/src/lib/chatStream.test.ts
index 339eaa9..d4e32d7 100644
--- a/src/lib/chatStream.test.ts
+++ b/src/lib/chatStream.test.ts
@@ -60,7 +60,7 @@ describe("streamAgentChat", () => {
 
     await streamAgentChat({
       message: "hi",
-      model: "deepseek/deepseek-v4-pro",
+      model: "deepseek/deepseek-v4-flash",
       onEvent: (event) => events.push(event),
     });
 
@@ -73,7 +73,7 @@ describe("streamAgentChat", () => {
         body: JSON.stringify({
           message: "hi",
           session_id: undefined,
-          model: "deepseek/deepseek-v4-pro",
+          model: "deepseek/deepseek-v4-flash",
           approval_mode: undefined,
         }),
       }),