diff --git a/mark b/mark
new file mode 100755
index 0000000..1ec2eb3
--- /dev/null
+++ b/mark
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+sed -i "s/&&&BUILDVER&&&/$(date +'%Y%m%d-%H%M%S')/" src/lib/Sidebar.svelte
diff --git a/src/lib/Settings.svelte b/src/lib/Settings.svelte
index 2cdf58c..35228c3 100644
--- a/src/lib/Settings.svelte
+++ b/src/lib/Settings.svelte
@@ -20,7 +20,7 @@ import {
 } from './Types.svelte'
     import { getModelDetail, getTokens } from './Models.svelte'
 
-const defaultModel:Model = 'gpt-3.5-turbo'
+const defaultModel:Model = 'gpt-4'
 const defaultModelPetals:Model = 'stabilityai/StableBeluga2'
 
 export const getDefaultModel = (): Model => {
diff --git a/src/lib/Sidebar.svelte b/src/lib/Sidebar.svelte
index e090c9a..d63d525 100644
--- a/src/lib/Sidebar.svelte
+++ b/src/lib/Sidebar.svelte
@@ -35,6 +35,7 @@
         <a class="navbar-item gpt-logo" href={'#/'}>
           <img src={logo} alt="ChatGPT-web" width="24" height="24" />
           <p class="ml-2 is-size-5 has-text-weight-bold">ChatGPT-web</p>
+          <p style="font-size:10px;" class="ml-2">&&&BUILDVER&&&</p>
         </a>
         <div class="chat-option-menu navbar-item is-pulled-right">
           <ChatOptionMenu bind:chatId={activeChatId} />