diff --git a/packages/cli/src/config/auth.ts b/packages/cli/src/config/auth.ts
index e05b029d9..b77145edf 100644
--- a/packages/cli/src/config/auth.ts
+++ b/packages/cli/src/config/auth.ts
@@ -10,6 +10,7 @@ import type {
   ProviderModelConfig,
 } from '@qwen-code/qwen-code-core';
 import { loadEnvironment, loadSettings, type Settings } from './settings.js';
+import { t } from '../i18n/index.js';
 
 /**
  * Default environment variable names for each auth type
@@ -89,9 +90,9 @@ export function validateAuthMethod(authMethod: string): string | null {
       const envKeyHint = checkedEnvKey
         ? `'${checkedEnvKey}'`
         : "'OPENAI_API_KEY' (or configure modelProviders[].envKey)";
-      return (
-        'Missing API key for OpenAI-compatible auth. ' +
-        `Set settings.security.auth.apiKey, or set the ${envKeyHint} environment variable.`
+      return t(
+        'Missing API key for OpenAI-compatible auth. Set settings.security.auth.apiKey, or set the {{envKeyHint}} environment variable.',
+        { envKeyHint },
       );
     }
     return null;
@@ -110,7 +111,9 @@ export function validateAuthMethod(authMethod: string): string | null {
     );
     if (!hasKey) {
       const envKeyHint = checkedEnvKey || 'ANTHROPIC_API_KEY';
-      return `${envKeyHint} environment variable not found.`;
+      return t('{{envKeyHint}} environment variable not found.', {
+        envKeyHint,
+      });
     }
 
     // Check baseUrl - can come from modelProviders or environment
@@ -122,7 +125,9 @@ export function validateAuthMethod(authMethod: string): string | null {
     const hasBaseUrl =
       modelConfig?.baseUrl || process.env['ANTHROPIC_BASE_URL'];
     if (!hasBaseUrl) {
-      return 'ANTHROPIC_BASE_URL environment variable not found (or configure modelProviders[].baseUrl).';
+      return t(
+        'ANTHROPIC_BASE_URL environment variable not found (or configure modelProviders[].baseUrl).',
+      );
     }
 
     return null;
@@ -135,7 +140,10 @@ export function validateAuthMethod(authMethod: string): string | null {
     );
     if (!hasKey) {
       const envKeyHint = checkedEnvKey || 'GEMINI_API_KEY';
-      return `${envKeyHint} environment variable not found. Please set it in your .env file or environment variables.`;
+      return t(
+        '{{envKeyHint}} environment variable not found. Please set it in your .env file or environment variables.',
+        { envKeyHint },
+      );
     }
     return null;
   }
@@ -147,12 +155,15 @@ export function validateAuthMethod(authMethod: string): string | null {
     );
     if (!hasKey) {
       const envKeyHint = checkedEnvKey || 'GOOGLE_API_KEY';
-      return `${envKeyHint} environment variable not found. Please set it in your .env file or environment variables.`;
+      return t(
+        '{{envKeyHint}} environment variable not found. Please set it in your .env file or environment variables.',
+        { envKeyHint },
+      );
     }
 
     process.env['GOOGLE_GENAI_USE_VERTEXAI'] = 'true';
     return null;
   }
 
-  return 'Invalid auth method selected.';
+  return t('Invalid auth method selected.');
 }
diff --git a/packages/cli/src/i18n/locales/de.js b/packages/cli/src/i18n/locales/de.js
index 71624b797..274f3e68d 100644
--- a/packages/cli/src/i18n/locales/de.js
+++ b/packages/cli/src/i18n/locales/de.js
@@ -792,6 +792,16 @@ export default {
     'Authentifizierung abgelaufen. Bitte versuchen Sie es erneut.',
   'Waiting for auth... (Press ESC or CTRL+C to cancel)':
     'Warten auf Authentifizierung... (ESC oder STRG+C zum Abbrechen drücken)',
+  'Missing API key for OpenAI-compatible auth. Set settings.security.auth.apiKey, or set the {{envKeyHint}} environment variable.':
+    'API-Schlüssel für OpenAI-kompatible Authentifizierung fehlt. Setzen Sie settings.security.auth.apiKey oder die Umgebungsvariable {{envKeyHint}}.',
+  '{{envKeyHint}} environment variable not found.':
+    'Umgebungsvariable {{envKeyHint}} wurde nicht gefunden.',
+  '{{envKeyHint}} environment variable not found. Please set it in your .env file or environment variables.':
+    'Umgebungsvariable {{envKeyHint}} wurde nicht gefunden. Bitte legen Sie sie in Ihrer .env-Datei oder den Systemumgebungsvariablen fest.',
+  'ANTHROPIC_BASE_URL environment variable not found (or configure modelProviders[].baseUrl).':
+    'Umgebungsvariable ANTHROPIC_BASE_URL wurde nicht gefunden (oder konfigurieren Sie modelProviders[].baseUrl).',
+  'Invalid auth method selected.':
+    'Ungültige Authentifizierungsmethode ausgewählt.',
   'Failed to authenticate. Message: {{message}}':
     'Authentifizierung fehlgeschlagen. Meldung: {{message}}',
   'Authenticated successfully with {{authType}} credentials.':
@@ -814,6 +824,15 @@ export default {
   // ============================================================================
   'Select Model': 'Modell auswählen',
   '(Press Esc to close)': '(Esc zum Schließen drücken)',
+  'Current (effective) configuration': 'Aktuelle (wirksame) Konfiguration',
+  AuthType: 'Authentifizierungstyp',
+  'API Key': 'API-Schlüssel',
+  unset: 'nicht gesetzt',
+  '(default)': '(Standard)',
+  '(set)': '(gesetzt)',
+  '(not set)': '(nicht gesetzt)',
+  "Failed to switch model to '{{modelId}}'.\n\n{{error}}":
+    "Modell konnte nicht auf '{{modelId}}' umgestellt werden.\n\n{{error}}",
   'The latest Qwen Coder model from Alibaba Cloud ModelStudio (version: qwen3-coder-plus-2025-09-23)':
     'Das neueste Qwen Coder Modell von Alibaba Cloud ModelStudio (Version: qwen3-coder-plus-2025-09-23)',
   'The latest Qwen Vision model from Alibaba Cloud ModelStudio (version: qwen3-vl-plus-2025-09-23)':
diff --git a/packages/cli/src/i18n/locales/en.js b/packages/cli/src/i18n/locales/en.js
index 5e8b16629..e34fe1710 100644
--- a/packages/cli/src/i18n/locales/en.js
+++ b/packages/cli/src/i18n/locales/en.js
@@ -770,6 +770,15 @@ export default {
     'Authentication timed out. Please try again.',
   'Waiting for auth... (Press ESC or CTRL+C to cancel)':
     'Waiting for auth... (Press ESC or CTRL+C to cancel)',
+  'Missing API key for OpenAI-compatible auth. Set settings.security.auth.apiKey, or set the {{envKeyHint}} environment variable.':
+    'Missing API key for OpenAI-compatible auth. Set settings.security.auth.apiKey, or set the {{envKeyHint}} environment variable.',
+  '{{envKeyHint}} environment variable not found.':
+    '{{envKeyHint}} environment variable not found.',
+  '{{envKeyHint}} environment variable not found. Please set it in your .env file or environment variables.':
+    '{{envKeyHint}} environment variable not found. Please set it in your .env file or environment variables.',
+  'ANTHROPIC_BASE_URL environment variable not found (or configure modelProviders[].baseUrl).':
+    'ANTHROPIC_BASE_URL environment variable not found (or configure modelProviders[].baseUrl).',
+  'Invalid auth method selected.': 'Invalid auth method selected.',
   'Failed to authenticate. Message: {{message}}':
     'Failed to authenticate. Message: {{message}}',
   'Authenticated successfully with {{authType}} credentials.':
@@ -791,6 +800,15 @@ export default {
   // ============================================================================
   'Select Model': 'Select Model',
   '(Press Esc to close)': '(Press Esc to close)',
+  'Current (effective) configuration': 'Current (effective) configuration',
+  AuthType: 'AuthType',
+  'API Key': 'API Key',
+  unset: 'unset',
+  '(default)': '(default)',
+  '(set)': '(set)',
+  '(not set)': '(not set)',
+  "Failed to switch model to '{{modelId}}'.\n\n{{error}}":
+    "Failed to switch model to '{{modelId}}'.\n\n{{error}}",
   'The latest Qwen Coder model from Alibaba Cloud ModelStudio (version: qwen3-coder-plus-2025-09-23)':
     'The latest Qwen Coder model from Alibaba Cloud ModelStudio (version: qwen3-coder-plus-2025-09-23)',
   'The latest Qwen Vision model from Alibaba Cloud ModelStudio (version: qwen3-vl-plus-2025-09-23)':
diff --git a/packages/cli/src/i18n/locales/ru.js b/packages/cli/src/i18n/locales/ru.js
index 9685c104b..02de921b2 100644
--- a/packages/cli/src/i18n/locales/ru.js
+++ b/packages/cli/src/i18n/locales/ru.js
@@ -786,6 +786,15 @@ export default {
     'Время ожидания авторизации истекло. Пожалуйста, попробуйте снова.',
   'Waiting for auth... (Press ESC or CTRL+C to cancel)':
     'Ожидание авторизации... (Нажмите ESC или CTRL+C для отмены)',
+  'Missing API key for OpenAI-compatible auth. Set settings.security.auth.apiKey, or set the {{envKeyHint}} environment variable.':
+    'Отсутствует API-ключ для аутентификации, совместимой с OpenAI. Укажите settings.security.auth.apiKey или переменную окружения {{envKeyHint}}.',
+  '{{envKeyHint}} environment variable not found.':
+    'Переменная окружения {{envKeyHint}} не найдена.',
+  '{{envKeyHint}} environment variable not found. Please set it in your .env file or environment variables.':
+    'Переменная окружения {{envKeyHint}} не найдена. Укажите её в файле .env или среди системных переменных.',
+  'ANTHROPIC_BASE_URL environment variable not found (or configure modelProviders[].baseUrl).':
+    'Переменная окружения ANTHROPIC_BASE_URL не найдена (или настройте modelProviders[].baseUrl).',
+  'Invalid auth method selected.': 'Выбран недопустимый метод авторизации.',
   'Failed to authenticate. Message: {{message}}':
     'Не удалось авторизоваться. Сообщение: {{message}}',
   'Authenticated successfully with {{authType}} credentials.':
@@ -807,6 +816,15 @@ export default {
   // ============================================================================
   'Select Model': 'Выбрать модель',
   '(Press Esc to close)': '(Нажмите Esc для закрытия)',
+  'Current (effective) configuration': 'Текущая (фактическая) конфигурация',
+  AuthType: 'Тип авторизации',
+  'API Key': 'API-ключ',
+  unset: 'не задано',
+  '(default)': '(по умолчанию)',
+  '(set)': '(установлено)',
+  '(not set)': '(не задано)',
+  "Failed to switch model to '{{modelId}}'.\n\n{{error}}":
+    "Не удалось переключиться на модель '{{modelId}}'.\n\n{{error}}",
   'The latest Qwen Coder model from Alibaba Cloud ModelStudio (version: qwen3-coder-plus-2025-09-23)':
     'Последняя модель Qwen Coder от Alibaba Cloud ModelStudio (версия: qwen3-coder-plus-2025-09-23)',
   'The latest Qwen Vision model from Alibaba Cloud ModelStudio (version: qwen3-vl-plus-2025-09-23)':
diff --git a/packages/cli/src/i18n/locales/zh.js b/packages/cli/src/i18n/locales/zh.js
index c3550f7e8..3f6b1368a 100644
--- a/packages/cli/src/i18n/locales/zh.js
+++ b/packages/cli/src/i18n/locales/zh.js
@@ -728,6 +728,15 @@ export default {
   'Authentication timed out. Please try again.': '认证超时。请重试。',
   'Waiting for auth... (Press ESC or CTRL+C to cancel)':
     '正在等待认证...（按 ESC 或 CTRL+C 取消）',
+  'Missing API key for OpenAI-compatible auth. Set settings.security.auth.apiKey, or set the {{envKeyHint}} environment variable.':
+    '缺少 OpenAI 兼容认证的 API 密钥。请设置 settings.security.auth.apiKey 或设置 {{envKeyHint}} 环境变量。',
+  '{{envKeyHint}} environment variable not found.':
+    '未找到 {{envKeyHint}} 环境变量。',
+  '{{envKeyHint}} environment variable not found. Please set it in your .env file or environment variables.':
+    '未找到 {{envKeyHint}} 环境变量。请在 .env 文件或系统环境变量中进行设置。',
+  'ANTHROPIC_BASE_URL environment variable not found (or configure modelProviders[].baseUrl).':
+    '未找到 ANTHROPIC_BASE_URL 环境变量（或配置 modelProviders[].baseUrl）。',
+  'Invalid auth method selected.': '选择了无效的认证方式。',
   'Failed to authenticate. Message: {{message}}': '认证失败。消息：{{message}}',
   'Authenticated successfully with {{authType}} credentials.':
     '使用 {{authType}} 凭据成功认证。',
@@ -747,6 +756,15 @@ export default {
   // ============================================================================
   'Select Model': '选择模型',
   '(Press Esc to close)': '（按 Esc 关闭）',
+  'Current (effective) configuration': '当前（实际生效）配置',
+  AuthType: '认证方式',
+  'API Key': 'API 密钥',
+  unset: '未设置',
+  '(default)': '(默认)',
+  '(set)': '(已设置)',
+  '(not set)': '(未设置)',
+  "Failed to switch model to '{{modelId}}'.\n\n{{error}}":
+    "无法切换到模型 '{{modelId}}'.\n\n{{error}}",
   'The latest Qwen Coder model from Alibaba Cloud ModelStudio (version: qwen3-coder-plus-2025-09-23)':
     '来自阿里云 ModelStudio 的最新 Qwen Coder 模型（版本：qwen3-coder-plus-2025-09-23）',
   'The latest Qwen Vision model from Alibaba Cloud ModelStudio (version: qwen3-vl-plus-2025-09-23)':
diff --git a/packages/cli/src/ui/commands/modelCommand.ts b/packages/cli/src/ui/commands/modelCommand.ts
index e0971bdde..4dcc9a518 100644
--- a/packages/cli/src/ui/commands/modelCommand.ts
+++ b/packages/cli/src/ui/commands/modelCommand.ts
@@ -29,7 +29,7 @@ export const modelCommand: SlashCommand = {
       return {
         type: 'message',
         messageType: 'error',
-        content: 'Configuration not available.',
+        content: t('Configuration not available.'),
       };
     }