Remove previewFeatures and default to Gemini 3 (#18414)

packages/cli/src/config/config.test.ts

@@ -1683,7 +1683,7 @@ describe('loadCliConfig model selection', () => {
       argv,
     );
 
-    expect(config.getModel()).toBe('auto-gemini-2.5');
+    expect(config.getModel()).toBe('auto-gemini-3');
   });
 
   it('always prefers model from argv', async () => {
@@ -1727,7 +1727,7 @@ describe('loadCliConfig model selection', () => {
       argv,
     );
 
-    expect(config.getModel()).toBe('auto-gemini-2.5');
+    expect(config.getModel()).toBe('auto-gemini-3');
   });
 });
 

packages/cli/src/config/config.ts

@@ -15,7 +15,6 @@ import {
   setGeminiMdFilename as setServerGeminiMdFilename,
   getCurrentGeminiMdFilename,
   ApprovalMode,
-  DEFAULT_GEMINI_MODEL_AUTO,
   DEFAULT_GEMINI_EMBEDDING_MODEL,
   DEFAULT_FILE_FILTERING_OPTIONS,
   DEFAULT_MEMORY_FILE_FILTERING_OPTIONS,
@@ -662,9 +661,7 @@ export async function loadCliConfig(
   );
   policyEngineConfig.nonInteractive = !interactive;
 
-  const defaultModel = settings.general?.previewFeatures
-    ? PREVIEW_GEMINI_MODEL_AUTO
-    : DEFAULT_GEMINI_MODEL_AUTO;
+  const defaultModel = PREVIEW_GEMINI_MODEL_AUTO;
   const specifiedModel =
     argv.model || process.env['GEMINI_MODEL'] || settings.model?.name;
 
@@ -740,7 +737,6 @@ export async function loadCliConfig(
       settings.context?.loadMemoryFromIncludeDirectories || false,
     debugMode,
     question,
-    previewFeatures: settings.general?.previewFeatures,
 
     coreTools: settings.tools?.core || undefined,
     allowedTools: allowedTools.length > 0 ? allowedTools : undefined,

packages/cli/src/config/settingsSchema.test.ts

@@ -328,30 +328,6 @@ describe('SettingsSchema', () => {
       ).toBe('Enable debug logging of keystrokes to the console.');
     });
 
-    it('should have previewFeatures setting in schema', () => {
-      expect(
-        getSettingsSchema().general.properties.previewFeatures,
-      ).toBeDefined();
-      expect(getSettingsSchema().general.properties.previewFeatures.type).toBe(
-        'boolean',
-      );
-      expect(
-        getSettingsSchema().general.properties.previewFeatures.category,
-      ).toBe('General');
-      expect(
-        getSettingsSchema().general.properties.previewFeatures.default,
-      ).toBe(false);
-      expect(
-        getSettingsSchema().general.properties.previewFeatures.requiresRestart,
-      ).toBe(false);
-      expect(
-        getSettingsSchema().general.properties.previewFeatures.showInDialog,
-      ).toBe(true);
-      expect(
-        getSettingsSchema().general.properties.previewFeatures.description,
-      ).toBe('Enable preview features (e.g., preview models).');
-    });
-
     it('should have enableAgents setting in schema', () => {
       const setting = getSettingsSchema().experimental.properties.enableAgents;
       expect(setting).toBeDefined();

packages/cli/src/config/settingsSchema.ts

@@ -162,15 +162,6 @@ const SETTINGS_SCHEMA = {
     description: 'General application settings.',
     showInDialog: false,
     properties: {
-      previewFeatures: {
-        type: 'boolean',
-        label: 'Preview Features (e.g., models)',
-        category: 'General',
-        requiresRestart: false,
-        default: false,
-        description: 'Enable preview features (e.g., preview models).',
-        showInDialog: true,
-      },
       preferredEditor: {
         type: 'string',
         label: 'Preferred Editor',

packages/cli/src/config/settings_repro.test.ts

@@ -134,7 +134,6 @@ describe('Settings Repro', () => {
         enablePromptCompletion: false,
         preferredEditor: 'vim',
         vimMode: false,
-        previewFeatures: false,
       },
       security: {
         auth: {