diff --git a/packages/cli/src/ui/commands/authCommand.test.ts b/packages/cli/src/ui/commands/authCommand.test.ts
index 6df88c3f79..ba1e369b14 100644
--- a/packages/cli/src/ui/commands/authCommand.test.ts
+++ b/packages/cli/src/ui/commands/authCommand.test.ts
@@ -4,19 +4,44 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { describe, it, expect, beforeEach } from 'vitest';
+import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { authCommand } from './authCommand.js';
 import { type CommandContext } from './types.js';
 import { createMockCommandContext } from '../../test-utils/mockCommandContext.js';
+import { SettingScope } from '../../config/settings.js';
+
+vi.mock('@google/gemini-cli-core', async () => {
+  const actual = await vi.importActual('@google/gemini-cli-core');
+  return {
+    ...actual,
+    clearCachedCredentialFile: vi.fn().mockResolvedValue(undefined),
+  };
+});
 
 describe('authCommand', () => {
   let mockContext: CommandContext;
 
   beforeEach(() => {
-    mockContext = createMockCommandContext();
+    mockContext = createMockCommandContext({
+      services: {
+        config: {
+          getGeminiClient: vi.fn(),
+        },
+      },
+    });
+    // Add setValue mock to settings
+    mockContext.services.settings.setValue = vi.fn();
+    vi.clearAllMocks();
   });
 
-  it('should return a dialog action to open the auth dialog', () => {
+  it('should have subcommands: login and logout', () => {
+    expect(authCommand.subCommands).toBeDefined();
+    expect(authCommand.subCommands).toHaveLength(2);
+    expect(authCommand.subCommands?.[0]?.name).toBe('login');
+    expect(authCommand.subCommands?.[1]?.name).toBe('logout');
+  });
+
+  it('should return a dialog action to open the auth dialog when called with no args', () => {
     if (!authCommand.action) {
       throw new Error('The auth command must have an action.');
     }
@@ -31,6 +56,76 @@ describe('authCommand', () => {
 
   it('should have the correct name and description', () => {
     expect(authCommand.name).toBe('auth');
-    expect(authCommand.description).toBe('Change the auth method');
+    expect(authCommand.description).toBe('Manage authentication');
+  });
+
+  describe('auth login subcommand', () => {
+    it('should return auth dialog action', () => {
+      const loginCommand = authCommand.subCommands?.[0];
+      expect(loginCommand?.name).toBe('login');
+      const result = loginCommand!.action!(mockContext, '');
+      expect(result).toEqual({ type: 'dialog', dialog: 'auth' });
+    });
+  });
+
+  describe('auth logout subcommand', () => {
+    it('should clear cached credentials', async () => {
+      const logoutCommand = authCommand.subCommands?.[1];
+      expect(logoutCommand?.name).toBe('logout');
+
+      const { clearCachedCredentialFile } = await import(
+        '@google/gemini-cli-core'
+      );
+
+      await logoutCommand!.action!(mockContext, '');
+
+      expect(clearCachedCredentialFile).toHaveBeenCalledOnce();
+    });
+
+    it('should clear selectedAuthType setting', async () => {
+      const logoutCommand = authCommand.subCommands?.[1];
+
+      await logoutCommand!.action!(mockContext, '');
+
+      expect(mockContext.services.settings.setValue).toHaveBeenCalledWith(
+        SettingScope.User,
+        'security.auth.selectedType',
+        undefined,
+      );
+    });
+
+    it('should strip thoughts from history', async () => {
+      const logoutCommand = authCommand.subCommands?.[1];
+      const mockStripThoughts = vi.fn();
+      const mockClient = {
+        stripThoughtsFromHistory: mockStripThoughts,
+      } as unknown as ReturnType<
+        NonNullable<typeof mockContext.services.config>['getGeminiClient']
+      >;
+
+      if (mockContext.services.config) {
+        mockContext.services.config.getGeminiClient = vi.fn(() => mockClient);
+      }
+
+      await logoutCommand!.action!(mockContext, '');
+
+      expect(mockStripThoughts).toHaveBeenCalled();
+    });
+
+    it('should return logout action to signal explicit state change', async () => {
+      const logoutCommand = authCommand.subCommands?.[1];
+      const result = await logoutCommand!.action!(mockContext, '');
+
+      expect(result).toEqual({ type: 'logout' });
+    });
+
+    it('should handle missing config gracefully', async () => {
+      const logoutCommand = authCommand.subCommands?.[1];
+      mockContext.services.config = null;
+
+      const result = await logoutCommand!.action!(mockContext, '');
+
+      expect(result).toEqual({ type: 'logout' });
+    });
   });
 });
diff --git a/packages/cli/src/ui/commands/authCommand.ts b/packages/cli/src/ui/commands/authCommand.ts
index dfb113e504..0314555baf 100644
--- a/packages/cli/src/ui/commands/authCommand.ts
+++ b/packages/cli/src/ui/commands/authCommand.ts
@@ -4,12 +4,18 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import type { OpenDialogActionReturn, SlashCommand } from './types.js';
+import type {
+  OpenDialogActionReturn,
+  SlashCommand,
+  LogoutActionReturn,
+} from './types.js';
 import { CommandKind } from './types.js';
+import { clearCachedCredentialFile } from '@google/gemini-cli-core';
+import { SettingScope } from '../../config/settings.js';
 
-export const authCommand: SlashCommand = {
-  name: 'auth',
-  description: 'Change the auth method',
+const authLoginCommand: SlashCommand = {
+  name: 'login',
+  description: 'Login or change the auth method',
   kind: CommandKind.BUILT_IN,
   autoExecute: true,
   action: (_context, _args): OpenDialogActionReturn => ({
@@ -17,3 +23,34 @@ export const authCommand: SlashCommand = {
     dialog: 'auth',
   }),
 };
+
+const authLogoutCommand: SlashCommand = {
+  name: 'logout',
+  description: 'Log out and clear all cached credentials',
+  kind: CommandKind.BUILT_IN,
+  action: async (context, _args): Promise<LogoutActionReturn> => {
+    await clearCachedCredentialFile();
+    // Clear the selected auth type so user sees the auth selection menu
+    context.services.settings.setValue(
+      SettingScope.User,
+      'security.auth.selectedType',
+      undefined,
+    );
+    // Strip thoughts from history instead of clearing completely
+    context.services.config?.getGeminiClient()?.stripThoughtsFromHistory();
+    // Return logout action to signal explicit state change
+    return {
+      type: 'logout',
+    };
+  },
+};
+
+export const authCommand: SlashCommand = {
+  name: 'auth',
+  description: 'Manage authentication',
+  kind: CommandKind.BUILT_IN,
+  subCommands: [authLoginCommand, authLogoutCommand],
+  action: (context, args) =>
+    // Default to login if no subcommand is provided
+    authLoginCommand.action!(context, args),
+};
diff --git a/packages/cli/src/ui/commands/types.ts b/packages/cli/src/ui/commands/types.ts
index 99d98f4009..6f00695dc4 100644
--- a/packages/cli/src/ui/commands/types.ts
+++ b/packages/cli/src/ui/commands/types.ts
@@ -142,13 +142,22 @@ export interface OpenCustomDialogActionReturn {
   component: ReactNode;
 }
 
+/**
+ * The return type for a command action that specifically handles logout logic,
+ * signaling the application to explicitly transition to an unauthenticated state.
+ */
+export interface LogoutActionReturn {
+  type: 'logout';
+}
+
 export type SlashCommandActionReturn =
   | CommandActionReturn<HistoryItemWithoutId[]>
   | QuitActionReturn
   | OpenDialogActionReturn
   | ConfirmShellCommandsActionReturn
   | ConfirmActionReturn
-  | OpenCustomDialogActionReturn;
+  | OpenCustomDialogActionReturn
+  | LogoutActionReturn;
 
 export enum CommandKind {
   BUILT_IN = 'built-in',
diff --git a/packages/cli/src/ui/components/LogoutConfirmationDialog.test.tsx b/packages/cli/src/ui/components/LogoutConfirmationDialog.test.tsx
new file mode 100644
index 0000000000..f51116f5e7
--- /dev/null
+++ b/packages/cli/src/ui/components/LogoutConfirmationDialog.test.tsx
@@ -0,0 +1,82 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { renderWithProviders } from '../../test-utils/render.js';
+import { act } from 'react';
+import { vi, describe, it, expect, beforeEach } from 'vitest';
+import {
+  LogoutConfirmationDialog,
+  LogoutChoice,
+} from './LogoutConfirmationDialog.js';
+import { RadioButtonSelect } from './shared/RadioButtonSelect.js';
+
+vi.mock('./shared/RadioButtonSelect.js', () => ({
+  RadioButtonSelect: vi.fn(() => null),
+}));
+
+describe('LogoutConfirmationDialog', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('should render the dialog with title, description, and hint', () => {
+    const { lastFrame } = renderWithProviders(
+      <LogoutConfirmationDialog onSelect={vi.fn()} />,
+    );
+
+    expect(lastFrame()).toContain('You are now logged out.');
+    expect(lastFrame()).toContain(
+      'Login again to continue using Gemini CLI, or exit the application.',
+    );
+    expect(lastFrame()).toContain('(Use Enter to select, Esc to close)');
+  });
+
+  it('should render RadioButtonSelect with Login and Exit options', () => {
+    renderWithProviders(<LogoutConfirmationDialog onSelect={vi.fn()} />);
+
+    expect(RadioButtonSelect).toHaveBeenCalled();
+    const mockCall = vi.mocked(RadioButtonSelect).mock.calls[0][0];
+    expect(mockCall.items).toEqual([
+      { label: 'Login', value: LogoutChoice.LOGIN, key: 'login' },
+      { label: 'Exit', value: LogoutChoice.EXIT, key: 'exit' },
+    ]);
+    expect(mockCall.isFocused).toBe(true);
+  });
+
+  it('should call onSelect with LOGIN when Login is selected', () => {
+    const onSelect = vi.fn();
+    renderWithProviders(<LogoutConfirmationDialog onSelect={onSelect} />);
+
+    const mockCall = vi.mocked(RadioButtonSelect).mock.calls[0][0];
+    mockCall.onSelect(LogoutChoice.LOGIN);
+
+    expect(onSelect).toHaveBeenCalledWith(LogoutChoice.LOGIN);
+  });
+
+  it('should call onSelect with EXIT when Exit is selected', () => {
+    const onSelect = vi.fn();
+    renderWithProviders(<LogoutConfirmationDialog onSelect={onSelect} />);
+
+    const mockCall = vi.mocked(RadioButtonSelect).mock.calls[0][0];
+    mockCall.onSelect(LogoutChoice.EXIT);
+
+    expect(onSelect).toHaveBeenCalledWith(LogoutChoice.EXIT);
+  });
+
+  it('should call onSelect with EXIT when escape key is pressed', () => {
+    const onSelect = vi.fn();
+    const { stdin } = renderWithProviders(
+      <LogoutConfirmationDialog onSelect={onSelect} />,
+    );
+
+    act(() => {
+      // Send kitty escape key sequence
+      stdin.write('\u001b[27u');
+    });
+
+    expect(onSelect).toHaveBeenCalledWith(LogoutChoice.EXIT);
+  });
+});
diff --git a/packages/cli/src/ui/components/LogoutConfirmationDialog.tsx b/packages/cli/src/ui/components/LogoutConfirmationDialog.tsx
new file mode 100644
index 0000000000..97c73a96ed
--- /dev/null
+++ b/packages/cli/src/ui/components/LogoutConfirmationDialog.tsx
@@ -0,0 +1,79 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { Box, Text } from 'ink';
+import type React from 'react';
+import { theme } from '../semantic-colors.js';
+import type { RadioSelectItem } from './shared/RadioButtonSelect.js';
+import { RadioButtonSelect } from './shared/RadioButtonSelect.js';
+import { useKeypress } from '../hooks/useKeypress.js';
+
+export enum LogoutChoice {
+  LOGIN = 'login',
+  EXIT = 'exit',
+}
+
+interface LogoutConfirmationDialogProps {
+  onSelect: (choice: LogoutChoice) => void;
+}
+
+export const LogoutConfirmationDialog: React.FC<
+  LogoutConfirmationDialogProps
+> = ({ onSelect }) => {
+  // Handle escape key to exit (consistent with other dialogs)
+  useKeypress(
+    (key) => {
+      if (key.name === 'escape') {
+        onSelect(LogoutChoice.EXIT);
+      }
+    },
+    { isActive: true },
+  );
+
+  const options: Array<RadioSelectItem<LogoutChoice>> = [
+    {
+      label: 'Login',
+      value: LogoutChoice.LOGIN,
+      key: 'login',
+    },
+    {
+      label: 'Exit',
+      value: LogoutChoice.EXIT,
+      key: 'exit',
+    },
+  ];
+
+  return (
+    <Box flexDirection="row" width="100%">
+      <Box
+        flexDirection="column"
+        borderStyle="round"
+        borderColor={theme.border.focused}
+        padding={1}
+        flexGrow={1}
+        marginLeft={1}
+        marginRight={1}
+      >
+        <Box flexDirection="column" marginBottom={1}>
+          <Text bold color={theme.text.primary}>
+            You are now logged out.
+          </Text>
+          <Text color={theme.text.secondary}>
+            Login again to continue using Gemini CLI, or exit the application.
+          </Text>
+        </Box>
+
+        <RadioButtonSelect items={options} onSelect={onSelect} isFocused />
+
+        <Box marginTop={1}>
+          <Text color={theme.text.secondary}>
+            (Use Enter to select, Esc to close)
+          </Text>
+        </Box>
+      </Box>
+    </Box>
+  );
+};
diff --git a/packages/cli/src/ui/hooks/slashCommandProcessor.ts b/packages/cli/src/ui/hooks/slashCommandProcessor.ts
index 8296b88947..f85ec21c6b 100644
--- a/packages/cli/src/ui/hooks/slashCommandProcessor.ts
+++ b/packages/cli/src/ui/hooks/slashCommandProcessor.ts
@@ -4,7 +4,13 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { useCallback, useMemo, useEffect, useState } from 'react';
+import {
+  useCallback,
+  useMemo,
+  useEffect,
+  useState,
+  createElement,
+} from 'react';
 import { type PartListUnion } from '@google/genai';
 import process from 'node:process';
 import type { UseHistoryManagerReturn } from './useHistoryManager.js';
@@ -45,6 +51,11 @@ import {
 } from '../state/extensions.js';
 import { appEvents } from '../../utils/events.js';
 import { useAlternateBuffer } from './useAlternateBuffer.js';
+import {
+  LogoutConfirmationDialog,
+  LogoutChoice,
+} from '../components/LogoutConfirmationDialog.js';
+import { runExitCleanup } from '../../utils/cleanup.js';
 
 interface SlashCommandProcessorActions {
   openAuthDialog: () => void;
@@ -400,6 +411,22 @@ export const useSlashCommandProcessor = (
                     Date.now(),
                   );
                   return { type: 'handled' };
+                case 'logout':
+                  // Show logout confirmation dialog with Login/Exit options
+                  setCustomDialog(
+                    createElement(LogoutConfirmationDialog, {
+                      onSelect: async (choice: LogoutChoice) => {
+                        setCustomDialog(null);
+                        if (choice === LogoutChoice.LOGIN) {
+                          actions.openAuthDialog();
+                        } else {
+                          await runExitCleanup();
+                          process.exit(0);
+                        }
+                      },
+                    }),
+                  );
+                  return { type: 'handled' };
                 case 'dialog':
                   switch (result.dialog) {
                     case 'auth':