diff --git a/backend/internal/service/setting_parse.go b/backend/internal/service/setting_parse.go
index 36e7706dda..ade4de0d41 100644
--- a/backend/internal/service/setting_parse.go
+++ b/backend/internal/service/setting_parse.go
@@ -192,7 +192,8 @@ func (s *SettingService) InitializeDefaultSettings(ctx context.Context) error {
 		SettingKeyChannelMonitorHideThroughput:         "true",
 		SettingKeyChannelMonitorShowQuota:              "false",
 
-		// Grok: safe defaults — no cross-vendor model rewrite unless operators enable it.
+		// Grok compatibility defaults: cross-client mapping stays enabled unless
+		// operators explicitly disable it.
 		SettingKeyGrokDefaultTextModel:           "grok-4.6",
 		SettingKeyGrokCrossClientModelMapEnabled: "true",
 		SettingKeyGrokDefaultBaseURLMode:         GrokDefaultBaseURLModeCLI,
diff --git a/frontend/src/i18n/locales/en/admin/settings.ts b/frontend/src/i18n/locales/en/admin/settings.ts
index a40e9f962b..0c1318e8ce 100644
--- a/frontend/src/i18n/locales/en/admin/settings.ts
+++ b/frontend/src/i18n/locales/en/admin/settings.ts
@@ -465,7 +465,7 @@ export default {
         grokDefaultTextModel: 'Default Grok text model',
         grokDefaultTextModelHint: 'Used for empty model values and, only when the switch is enabled, requests from other client model namespaces. Custom Grok model IDs are accepted.',
         grokCrossClientMap: 'Map other clients to Grok',
-        grokCrossClientMapHint: 'Disabled by default. When enabled, GPT, Codex, o-series, and Claude model IDs are routed to the default Grok text model above.',
+        grokCrossClientMapHint: 'Enabled by default for client compatibility. GPT, Codex, o-series, and Claude model IDs are routed to the default Grok text model above. Disable this to require Grok model IDs.',
         grokDefaultBaseURLMode: 'Default Grok upstream',
         grokDefaultBaseURLModeHint: 'Used only when a Grok account has no explicit base URL. Media and voice endpoints continue to use their official API hosts.',
         grokBaseURLModeCLI: 'CLI chat proxy',
diff --git a/frontend/src/i18n/locales/zh/admin/settings.ts b/frontend/src/i18n/locales/zh/admin/settings.ts
index 78a76ff310..47f95d2afc 100644
--- a/frontend/src/i18n/locales/zh/admin/settings.ts
+++ b/frontend/src/i18n/locales/zh/admin/settings.ts
@@ -458,7 +458,7 @@ export default {
         grokDefaultTextModel: '默认 Grok 文本模型',
         grokDefaultTextModelHint: '用于空模型值；仅在右侧开关开启时也用于其他客户端模型命名空间。允许填写自定义 Grok 模型 ID。',
         grokCrossClientMap: '映射其他客户端模型到 Grok',
-        grokCrossClientMapHint: '默认关闭。开启后，GPT、Codex、o 系列和 Claude 模型 ID 会路由到左侧默认 Grok 文本模型。',
+        grokCrossClientMapHint: '为兼容客户端，默认开启。GPT、Codex、o 系列和 Claude 模型 ID 会路由到左侧默认 Grok 文本模型；关闭后必须使用 Grok 模型 ID。',
         grokDefaultBaseURLMode: '默认 Grok 上游',
         grokDefaultBaseURLModeHint: '仅用于 Grok 账号未配置显式 base URL 的文本请求；媒体和语音仍使用官方 API 主机。',
         grokBaseURLModeCLI: 'CLI 聊天代理',