diff --git a/frontend/src/components/account/BulkEditAccountModal.vue b/frontend/src/components/account/BulkEditAccountModal.vue
index 62a1d9a2..a9632a92 100644
--- a/frontend/src/components/account/BulkEditAccountModal.vue
+++ b/frontend/src/components/account/BulkEditAccountModal.vue
@@ -21,6 +21,16 @@
         </p>
       </div>
 
+      <!-- Mixed platform warning -->
+      <div v-if="isMixedPlatform" class="rounded-lg bg-amber-50 p-4 dark:bg-amber-900/20">
+        <p class="text-sm text-amber-700 dark:text-amber-400">
+          <svg class="mr-1.5 inline h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z" />
+          </svg>
+          {{ t('admin.accounts.bulkEdit.mixedPlatformWarning', { platforms: selectedPlatforms.join(', ') }) }}
+        </p>
+      </div>
+
       <!-- Base URL (API Key only) -->
       <div class="border-t border-gray-200 pt-4 dark:border-dark-600">
         <div class="mb-3 flex items-center justify-between">
@@ -157,7 +167,7 @@
             <!-- Model Checkbox List -->
             <div class="mb-3 grid grid-cols-2 gap-2">
               <label
-                v-for="model in allModels"
+                v-for="model in filteredModels"
                 :key="model.value"
                 class="flex cursor-pointer items-center rounded-lg border p-3 transition-all hover:bg-gray-50 dark:border-dark-600 dark:hover:bg-dark-700"
                 :class="
@@ -278,7 +288,7 @@
             <!-- Quick Add Buttons -->
             <div class="flex flex-wrap gap-2">
               <button
-                v-for="preset in presetMappings"
+                v-for="preset in filteredPresets"
                 :key="preset.label"
                 type="button"
                 :class="['rounded-lg px-3 py-1 text-xs transition-colors', preset.color]"
@@ -648,7 +658,7 @@ import { ref, watch, computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { useAppStore } from '@/stores/app'
 import { adminAPI } from '@/api/admin'
-import type { Proxy as ProxyConfig, AdminGroup } from '@/types'
+import type { Proxy as ProxyConfig, AdminGroup, AccountPlatform } from '@/types'
 import BaseDialog from '@/components/common/BaseDialog.vue'
 import Select from '@/components/common/Select.vue'
 import ProxySelector from '@/components/common/ProxySelector.vue'
@@ -659,6 +669,7 @@ import { buildModelMappingObject as buildModelMappingPayload } from '@/composabl
 interface Props {
   show: boolean
   accountIds: number[]
+  selectedPlatforms: AccountPlatform[]
   proxies: ProxyConfig[]
   groups: AdminGroup[]
 }
@@ -672,6 +683,31 @@ const emit = defineEmits<{
 const { t } = useI18n()
 const appStore = useAppStore()
 
+// Platform awareness
+const isMixedPlatform = computed(() => props.selectedPlatforms.length > 1)
+
+const platformModelPrefix: Record<string, string[]> = {
+  anthropic: ['claude-'],
+  antigravity: ['claude-'],
+  openai: ['gpt-'],
+  gemini: ['gemini-'],
+  sora: []
+}
+
+const filteredModels = computed(() => {
+  if (props.selectedPlatforms.length === 0) return allModels
+  const prefixes = [...new Set(props.selectedPlatforms.flatMap(p => platformModelPrefix[p] || []))]
+  if (prefixes.length === 0) return allModels
+  return allModels.filter(m => prefixes.some(prefix => m.value.startsWith(prefix)))
+})
+
+const filteredPresets = computed(() => {
+  if (props.selectedPlatforms.length === 0) return presetMappings
+  const prefixes = [...new Set(props.selectedPlatforms.flatMap(p => platformModelPrefix[p] || []))]
+  if (prefixes.length === 0) return presetMappings
+  return presetMappings.filter(m => prefixes.some(prefix => m.from.startsWith(prefix)))
+})
+
 // Model mapping type
 interface ModelMapping {
   from: string
@@ -718,6 +754,8 @@ const allModels = [
   { value: 'claude-3-opus-20240229', label: 'Claude 3 Opus' },
   { value: 'claude-3-5-sonnet-20241022', label: 'Claude 3.5 Sonnet' },
   { value: 'claude-3-haiku-20240307', label: 'Claude 3 Haiku' },
+  { value: 'gpt-5.3-codex', label: 'GPT-5.3 Codex' },
+  { value: 'gpt-5.3-codex-spark', label: 'GPT-5.3 Codex Spark' },
   { value: 'gpt-5.2-2025-12-11', label: 'GPT-5.2' },
   { value: 'gpt-5.2-codex', label: 'GPT-5.2 Codex' },
   { value: 'gpt-5.1-codex-max', label: 'GPT-5.1 Codex Max' },
@@ -806,6 +844,24 @@ const presetMappings = [
     to: 'claude-sonnet-4-5-20250929',
     color: 'bg-amber-100 text-amber-700 hover:bg-amber-200 dark:bg-amber-900/30 dark:text-amber-400'
   },
+  {
+    label: 'GPT-5.3 Codex',
+    from: 'gpt-5.3-codex',
+    to: 'gpt-5.3-codex',
+    color: 'bg-emerald-100 text-emerald-700 hover:bg-emerald-200 dark:bg-emerald-900/30 dark:text-emerald-400'
+  },
+  {
+    label: 'GPT-5.3 Spark',
+    from: 'gpt-5.3-codex-spark',
+    to: 'gpt-5.3-codex-spark',
+    color: 'bg-emerald-100 text-emerald-700 hover:bg-emerald-200 dark:bg-emerald-900/30 dark:text-emerald-400'
+  },
+  {
+    label: '5.2→5.3',
+    from: 'gpt-5.2-codex',
+    to: 'gpt-5.3-codex',
+    color: 'bg-lime-100 text-lime-700 hover:bg-lime-200 dark:bg-lime-900/30 dark:text-lime-400'
+  },
   {
     label: 'GPT-5.2',
     from: 'gpt-5.2-2025-12-11',
diff --git a/frontend/src/composables/useModelWhitelist.ts b/frontend/src/composables/useModelWhitelist.ts
index c13672b5..88f21d53 100644
--- a/frontend/src/composables/useModelWhitelist.ts
+++ b/frontend/src/composables/useModelWhitelist.ts
@@ -24,6 +24,8 @@ const openaiModels = [
   // GPT-5.2 系列
   'gpt-5.2', 'gpt-5.2-2025-12-11', 'gpt-5.2-chat-latest',
   'gpt-5.2-codex', 'gpt-5.2-pro', 'gpt-5.2-pro-2025-12-11',
+  // GPT-5.3 系列
+  'gpt-5.3-codex', 'gpt-5.3-codex-spark',
   'chatgpt-4o-latest',
   'gpt-4o-audio-preview', 'gpt-4o-realtime-preview'
 ]
diff --git a/frontend/src/i18n/locales/en.ts b/frontend/src/i18n/locales/en.ts
index cdd9ad19..b2eac925 100644
--- a/frontend/src/i18n/locales/en.ts
+++ b/frontend/src/i18n/locales/en.ts
@@ -1505,7 +1505,8 @@ export default {
         partialSuccess: 'Partially updated: {success} succeeded, {failed} failed',
         failed: 'Bulk update failed',
         noSelection: 'Please select accounts to edit',
-        noFieldsSelected: 'Select at least one field to update'
+        noFieldsSelected: 'Select at least one field to update',
+        mixedPlatformWarning: 'Selected accounts span multiple platforms ({platforms}). Model mapping presets shown are combined — ensure mappings are appropriate for each platform.'
       },
       bulkDeleteTitle: 'Bulk Delete Accounts',
       bulkDeleteConfirm: 'Delete the selected {count} account(s)? This action cannot be undone.',
diff --git a/frontend/src/i18n/locales/zh.ts b/frontend/src/i18n/locales/zh.ts
index 8ef50267..8366f9c4 100644
--- a/frontend/src/i18n/locales/zh.ts
+++ b/frontend/src/i18n/locales/zh.ts
@@ -1652,7 +1652,8 @@ export default {
         partialSuccess: '部分更新成功：成功 {success} 个，失败 {failed} 个',
         failed: '批量更新失败',
         noSelection: '请选择要编辑的账号',
-        noFieldsSelected: '请至少选择一个要更新的字段'
+        noFieldsSelected: '请至少选择一个要更新的字段',
+        mixedPlatformWarning: '所选账号跨越多个平台（{platforms}）。显示的模型映射预设为合并结果——请确保映射对每个平台都适用。'
       },
       bulkDeleteTitle: '批量删除账号',
       bulkDeleteConfirm: '确定要删除选中的 {count} 个账号吗？此操作无法撤销。',
diff --git a/frontend/src/views/admin/AccountsView.vue b/frontend/src/views/admin/AccountsView.vue
index 236c6f54..8c2837ee 100644
--- a/frontend/src/views/admin/AccountsView.vue
+++ b/frontend/src/views/admin/AccountsView.vue
@@ -259,7 +259,7 @@
     <AccountActionMenu :show="menu.show" :account="menu.acc" :position="menu.pos" @close="menu.show = false" @test="handleTest" @stats="handleViewStats" @reauth="handleReAuth" @refresh-token="handleRefresh" @reset-status="handleResetStatus" @clear-rate-limit="handleClearRateLimit" />
     <SyncFromCrsModal :show="showSync" @close="showSync = false" @synced="reload" />
     <ImportDataModal :show="showImportData" @close="showImportData = false" @imported="handleDataImported" />
-    <BulkEditAccountModal :show="showBulkEdit" :account-ids="selIds" :proxies="proxies" :groups="groups" @close="showBulkEdit = false" @updated="handleBulkUpdated" />
+    <BulkEditAccountModal :show="showBulkEdit" :account-ids="selIds" :selected-platforms="selPlatforms" :proxies="proxies" :groups="groups" @close="showBulkEdit = false" @updated="handleBulkUpdated" />
     <TempUnschedStatusModal :show="showTempUnsched" :account="tempUnschedAcc" @close="showTempUnsched = false" @reset="handleTempUnschedReset" />
     <ConfirmDialog :show="showDeleteDialog" :title="t('admin.accounts.deleteAccount')" :message="t('admin.accounts.deleteConfirm', { name: deletingAcc?.name })" :confirm-text="t('common.delete')" :cancel-text="t('common.cancel')" :danger="true" @confirm="confirmDelete" @cancel="showDeleteDialog = false" />
     <ConfirmDialog :show="showExportDataDialog" :title="t('admin.accounts.dataExport')" :message="t('admin.accounts.dataExportConfirmMessage')" :confirm-text="t('admin.accounts.dataExportConfirm')" :cancel-text="t('common.cancel')" @confirm="handleExportData" @cancel="showExportDataDialog = false">
@@ -303,7 +303,7 @@ import PlatformTypeBadge from '@/components/common/PlatformTypeBadge.vue'
 import Icon from '@/components/icons/Icon.vue'
 import ErrorPassthroughRulesModal from '@/components/admin/ErrorPassthroughRulesModal.vue'
 import { formatDateTime, formatRelativeTime } from '@/utils/format'
-import type { Account, Proxy, AdminGroup } from '@/types'
+import type { Account, AccountPlatform, Proxy, AdminGroup } from '@/types'
 
 const { t } = useI18n()
 const appStore = useAppStore()
@@ -312,6 +312,14 @@ const authStore = useAuthStore()
 const proxies = ref<Proxy[]>([])
 const groups = ref<AdminGroup[]>([])
 const selIds = ref<number[]>([])
+const selPlatforms = computed<AccountPlatform[]>(() => {
+  const platforms = new Set(
+    accounts.value
+      .filter(a => selIds.value.includes(a.id))
+      .map(a => a.platform)
+  )
+  return [...platforms]
+})
 const showCreate = ref(false)
 const showEdit = ref(false)
 const showSync = ref(false)