diff --git a/includes/Constants.php b/includes/Constants.php
index 008f3d78..9e17e1c1 100644
--- a/includes/Constants.php
+++ b/includes/Constants.php
@@ -168,21 +168,6 @@ final class Constants {
 	 */
 	public const QUERY_PARAM_SKIN = 'useskin';
 
-	/**
-	 * @var string
-	 */
-	public const FEATURE_USE_WVUI_SEARCH = 'UseWvuiSearch';
-
-	/**
-	 * @var string
-	 */
-	public const CONFIG_KEY_USE_WVUI_SEARCH = 'VectorUseWvuiSearch';
-
-	/**
-	 * @var string
-	 */
-	public const REQUIREMENT_USE_WVUI_SEARCH = 'VectorUseWvuiSearch';
-
 	/**
 	 * @var string
 	 */
@@ -256,18 +241,6 @@ final class Constants {
 	 */
 	public const SEARCH_BOX_INPUT_LOCATION_DEFAULT = 'header-navigation';
 
-	/**
-	 * Defines whether or not the Core/Vue.js Search Widget A/B test is running. See
-	 * https://phabricator.wikimedia.org/T261647 for additional detail about the test.
-	 *
-	 * Note well that if the associated config value is falsy, then we fall back to choosing the
-	 * search widget treatment based on the `VectorUseWvuiSearch` config variable (see
-	 * `resources/skins.vector.js/searchLoader.js`).
-	 *
-	 * @var string
-	 */
-	public const CONFIG_SEARCH_TREATMENT_AB_TEST = 'VectorSearchTreatmentABTest';
-
 	/**
 	 * @var string
 	 */
diff --git a/includes/FeatureManagement/Requirements/WvuiSearchTreatmentRequirement.php b/includes/FeatureManagement/Requirements/WvuiSearchTreatmentRequirement.php
deleted file mode 100644
index d3cbf45e..00000000
--- a/includes/FeatureManagement/Requirements/WvuiSearchTreatmentRequirement.php
+++ /dev/null
@@ -1,84 +0,0 @@
-<?php
-
-/**
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- * http://www.gnu.org/copyleft/gpl.html
- *
- * @file
- * @since 1.36
- */
-
-namespace Vector\FeatureManagement\Requirements;
-
-use Config;
-use Vector\Constants;
-use Vector\FeatureManagement\Requirement;
-
-/**
- * Checks whether or not WVUI search should be used.
- *
- * @unstable
- *
- * @package Vector\FeatureManagement\Requirements
- * @internal
- */
-final class WvuiSearchTreatmentRequirement implements Requirement {
-	/**
-	 * @var Config
-	 */
-	private $config;
-
-	/**
-	 * @var \User
-	 */
-	private $user;
-
-	/**
-	 * This constructor accepts all dependencies needed to determine
-	 * whether wvui search is enabled for current user and config.
-	 *
-	 * @param \Config $config
-	 * @param \User $user
-	 */
-	public function __construct( \Config $config, \User $user ) {
-		$this->config = $config;
-		$this->user = $user;
-	}
-
-	/**
-	 * @inheritDoc
-	 */
-	public function getName(): string {
-		return Constants::REQUIREMENT_USE_WVUI_SEARCH;
-	}
-
-	/**
-	 * If A/B test is enabled check whether the user is logged in and bucketed.
-	 * Fallback to `VectorUseWvuiSearch` config value.
-	 *
-	 * @inheritDoc
-	 * @throws \ConfigException
-	 */
-	public function isMet(): bool {
-		// Determine the search widget treatment to send to the user
-		$shouldUseWvuiSearch = (bool)$this->config->get( Constants::CONFIG_KEY_USE_WVUI_SEARCH );
-
-		if ( (bool)$this->config->get( Constants::CONFIG_SEARCH_TREATMENT_AB_TEST ) && $this->user->isRegistered() ) {
-			$shouldUseWvuiSearch = $this->user->getID() % 2 === 0;
-		}
-
-		return $shouldUseWvuiSearch;
-	}
-}
diff --git a/includes/Hooks.php b/includes/Hooks.php
index 58ff6288..b097f2b6 100644
--- a/includes/Hooks.php
+++ b/includes/Hooks.php
@@ -608,12 +608,7 @@ class Hooks {
 		} else {
 			// The modern Vector skin must also carry skin-vector for compatibility with older
 			// skins.
-			$bodyAttrs['class'] .= ' skin-vector';
-		}
-
-		// Determine the search widget treatment to send to the user
-		if ( VectorServices::getFeatureManager()->isFeatureEnabled( Constants::FEATURE_USE_WVUI_SEARCH ) ) {
-			$bodyAttrs['class'] .= ' skin-vector-search-vue';
+			$bodyAttrs['class'] .= ' skin-vector skin-vector-search-vue';
 		}
 
 		$config = $sk->getConfig();
diff --git a/includes/ServiceWiring.php b/includes/ServiceWiring.php
index 9cb9bf62..911e48ba 100644
--- a/includes/ServiceWiring.php
+++ b/includes/ServiceWiring.php
@@ -28,7 +28,6 @@ use Vector\FeatureManagement\FeatureManager;
 use Vector\FeatureManagement\Requirements\DynamicConfigRequirement;
 use Vector\FeatureManagement\Requirements\LatestSkinVersionRequirement;
 use Vector\FeatureManagement\Requirements\OverridableConfigRequirement;
-use Vector\FeatureManagement\Requirements\WvuiSearchTreatmentRequirement;
 use Vector\SkinVersionLookup;
 
 return [
@@ -202,24 +201,6 @@ return [
 			]
 		);
 
-		// Feature: Use Wvui Search
-		// ================================
-		$featureManager->registerRequirement(
-			new WvuiSearchTreatmentRequirement(
-				$services->getMainConfig(),
-				$context->getUser()
-			)
-		);
-
-		$featureManager->registerFeature(
-			Constants::FEATURE_USE_WVUI_SEARCH,
-			[
-				Constants::REQUIREMENT_FULLY_INITIALISED,
-				Constants::REQUIREMENT_LATEST_SKIN_VERSION,
-				Constants::REQUIREMENT_USE_WVUI_SEARCH
-			]
-		);
-
 		// Feature: Sticky header
 		// ================================
 		$featureManager->registerRequirement(
diff --git a/includes/SkinVector.php b/includes/SkinVector.php
index 85e5b3fd..092d942d 100644
--- a/includes/SkinVector.php
+++ b/includes/SkinVector.php
@@ -713,12 +713,7 @@ class SkinVector extends SkinMustache {
 		string $formId,
 		bool $autoExpandWidth
 	) {
-		$searchClass = '';
-
-		// Determine the search widget treatment to send to the user
-		if ( VectorServices::getFeatureManager()->isFeatureEnabled( Constants::FEATURE_USE_WVUI_SEARCH ) ) {
-			$searchClass .= 'vector-search-box-vue ';
-		}
+		$searchClass = 'vector-search-box-vue ';
 
 		if ( $isCollapsible ) {
 			$searchClass .= ' vector-search-box-collapses ';
@@ -790,8 +785,7 @@ class SkinVector extends SkinMustache {
 	private function doesSearchHaveThumbnails(): bool {
 		$featureManager = VectorServices::getFeatureManager();
 
-		return $featureManager->isFeatureEnabled( Constants::FEATURE_USE_WVUI_SEARCH ) &&
-			$this->getConfig()->get( 'VectorWvuiSearchOptions' )['showThumbnail'];
+		return $this->getConfig()->get( 'VectorWvuiSearchOptions' )['showThumbnail'];
 	}
 
 	/**
diff --git a/resources/skins.vector.js/searchLoader.js b/resources/skins.vector.js/searchLoader.js
index c43e1eda..5525b59c 100644
--- a/resources/skins.vector.js/searchLoader.js
+++ b/resources/skins.vector.js/searchLoader.js
@@ -140,7 +140,7 @@ function markLoadEnd( startMarker, endMarker, measureMarker ) {
  */
 function initSearchLoader( document ) {
 	var searchBoxes = document.querySelectorAll( '.vector-search-box' ),
-		shouldUseCoreSearch;
+		isWikidata = mw.config.get( 'wgWikiID' ) === 'wikidatawiki';
 
 	// Allow developers to defined $wgVectorSearchHost in LocalSettings to target different APIs
 	if ( config.wgVectorSearchHost ) {
@@ -151,28 +151,16 @@ function initSearchLoader( document ) {
 		return;
 	}
 
-	shouldUseCoreSearch = !document.body.classList.contains( 'skin-vector-search-vue' );
-
 	/**
-	 * 1. If $wgVectorUseWvuiSearch is false,
-	 *    or we are in a browser that doesn't support fetch
-	 *    load the legacy searchSuggest module. The check for window.fetch
+	 * 1. If we are in a browser that doesn't support fetch fall back to non-JS version.
+	 *   The check for window.fetch
 	 *    can be removed when IE11 support is finally officially dropped.
-	 * 2. If we're using a different search module, enable the loading indicator
-	 *    before the search module loads.
+	 * 2. Disable on Wikidata per T281318 until the REST API is ready.
 	 **/
-	if ( shouldUseCoreSearch || !window.fetch ) {
-		Array.prototype.forEach.call( searchBoxes, function ( searchBox ) {
-			var input = searchBox.querySelector( 'input[name="search"]' );
-			if ( input ) {
-				loadSearchModule(
-					input,
-					'mediawiki.searchSuggest',
-					null,
-					null
-				);
-			}
-		} );
+	if ( isWikidata || !window.fetch ) {
+		document.body.classList.remove(
+			'skin-vector-search-vue'
+		);
 		return;
 	}
 
diff --git a/skin.json b/skin.json
index 3176dedd..3f0b2db6 100644
--- a/skin.json
+++ b/skin.json
@@ -403,17 +403,10 @@
 			"value": "1",
 			"description": "@var string:['2'|'1'] The version ('2' for latest, '1' for legacy) of the Vector skin to **set** for newly created user accounts. **The value is persisted as a user preference.** This configuration is not used for preexisting accounts (see VectorDefaultSkinVersionForExistingAccounts) and only ever executed once at new account creation time."
 		},
-		"VectorUseWvuiSearch": {
-			"value": true
-		},
 		"VectorSkinMigrationMode": {
 			"value": false,
 			"description": "@internal. For usage to fulfil [[phab:T291098]]"
 		},
-		"VectorSearchTreatmentABTest": {
-			"value": false,
-			"description": "@var boolean Enables or disables the search treatment A/B test. See https://phabricator.wikimedia.org/T261647 and associated tasks for additional detail."
-		},
 		"VectorWvuiSearchOptions": {
 			"value": {
 				"showThumbnail": true,
diff --git a/tests/phpunit/unit/FeatureManagement/Requirements/WvuiSearchTreatmentRequirementTest.php b/tests/phpunit/unit/FeatureManagement/Requirements/WvuiSearchTreatmentRequirementTest.php
deleted file mode 100644
index 0182414c..00000000
--- a/tests/phpunit/unit/FeatureManagement/Requirements/WvuiSearchTreatmentRequirementTest.php
+++ /dev/null
@@ -1,133 +0,0 @@
-<?php
-/**
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- * http://www.gnu.org/copyleft/gpl.html
- *
- * @file
- */
-
-namespace Vector\FeatureManagement\Tests;
-
-use HashConfig;
-use User;
-use Vector\Constants;
-use Vector\FeatureManagement\Requirements\WvuiSearchTreatmentRequirement;
-
-/**
- * @group Vector
- * @group FeatureManagement
- * @coversDefaultClass \Vector\FeatureManagement\Requirements\WvuiSearchTreatmentRequirement
- */
-class WvuiSearchTreatmentRequirementTest extends \MediaWikiUnitTestCase {
-
-	public function providerWvuiSearchTreatmentRequirement() {
-		return [
-			[
-				// Is wvui search enabled
-				false,
-				// is A-B test enabled
-				false,
-				// note 0 = anon user
-				0,
-				false,
-				'If nothing enabled nobody gets wvui search'
-			],
-			[
-				// Is wvui search enabled
-				true,
-				// is A-B test enabled
-				false,
-				// note 0 = anon user
-				0,
-				true,
-				'Anon users should get wvui search if enabled when A/B test disabled'
-			],
-			[
-				// Is wvui search enabled
-				true,
-				// is A-B test enabled
-				false,
-				2,
-				true,
-				'Logged in users should get wvui search if enabled when A/B test disabled'
-			],
-			[
-				// Is wvui search enabled
-				true,
-				// is A-B test enabled
-				false,
-				1,
-				true,
-				'All odd logged in users should get wvui search when A/B test disabled'
-			],
-			[
-				// Is wvui search enabled
-				true,
-				// is A-B test enabled
-				true,
-				// note 0 = anon user
-				0,
-				true,
-				'Anon users with a/b test enabled should see wvui search when search config enabled'
-			],
-			[
-				// Is wvui search enabled
-				true,
-				// is A-B test enabled
-				true,
-				2,
-				true,
-				'Even logged in users get wvui search when A/B test enabled'
-			],
-			[
-				// Is wvui search enabled
-				true,
-				// is A-B test enabled
-				true,
-				1,
-				false,
-				'Odd logged in users do not wvui search when A/B test enabled'
-			],
-		];
-	}
-
-	/**
-	 * @covers ::isMet
-	 * @dataProvider providerWvuiSearchTreatmentRequirement
-	 * @param bool $wvuiSearchConfigValue
-	 * @param bool $abValue
-	 * @param int $userId
-	 * @param bool $expected
-	 * @param string $msg
-	 */
-	public function testWvuiSearchTreatmentRequirement(
-		$wvuiSearchConfigValue, $abValue, $userId, $expected, $msg
-	) {
-		$config = new HashConfig( [
-			Constants::CONFIG_KEY_USE_WVUI_SEARCH => $wvuiSearchConfigValue,
-			Constants::CONFIG_SEARCH_TREATMENT_AB_TEST => $abValue,
-		] );
-
-		$user = $this->createMock( User::class );
-		$user->method( 'isRegistered' )->willReturn( $userId !== 0 );
-		$user->method( 'getID' )->willReturn( $userId );
-
-		$requirement = new WvuiSearchTreatmentRequirement(
-			$config, $user
-		);
-
-		$this->assertSame( $expected, $requirement->isMet(), $msg );
-	}
-}