diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index 309cbd8d89d..a9414fd4657 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -655,7 +655,7 @@ class AnalysisServerOptions {
 
   /// Return `true` if the new relevance computations should be used when
   /// computing code completion suggestions.
-  bool useNewRelevance = false;
+  bool useNewRelevance = true;
 
   /// The set of enabled features.
   FeatureSet featureSet = FeatureSet();
diff --git a/pkg/analysis_server/lib/src/server/driver.dart b/pkg/analysis_server/lib/src/server/driver.dart
index 24504db1812..6e075f6d56b 100644
--- a/pkg/analysis_server/lib/src/server/driver.dart
+++ b/pkg/analysis_server/lib/src/server/driver.dart
@@ -827,6 +827,7 @@ class Driver implements ServerStarter {
     // Temporary flags.
     //
     parser.addFlag(USE_NEW_RELEVANCE,
+        defaultsTo: true,
         help: 'Use the new relevance computation for code completion.');
 
     return parser;
diff --git a/pkg/analysis_server/test/client/completion_driver_test.dart b/pkg/analysis_server/test/client/completion_driver_test.dart
index 23114538344..5ee0b8a1e5a 100644
--- a/pkg/analysis_server/test/client/completion_driver_test.dart
+++ b/pkg/analysis_server/test/client/completion_driver_test.dart
@@ -587,7 +587,6 @@ void main(List<String> args) {
             .relevance));
   }
 
-  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/38796')
   Future<void> test_project_suggestionRelevance_constructorsAndTypes() async {
     await addProjectFile('lib/a.dart', r'''
 class A { }
diff --git a/pkg/analysis_server/test/domain_completion_test.dart b/pkg/analysis_server/test/domain_completion_test.dart
index 35894ebde2a..d9bd0152beb 100644
--- a/pkg/analysis_server/test/domain_completion_test.dart
+++ b/pkg/analysis_server/test/domain_completion_test.dart
@@ -590,12 +590,15 @@ class B extends A {
   }
 
   Future<void> test_invocation_sdk_relevancy_on() {
-    addTestFile('main() {Map m; m.^}');
-    return getSuggestions().then((_) {
-      // Assert that the CommonUsageComputer is working
-      expect(suggestions.any((s) => s.relevance == DART_RELEVANCE_COMMON_USAGE),
-          isTrue);
-    });
+    if (!server.options.useNewRelevance) {
+      addTestFile('main() {Map m; m.^}');
+      return getSuggestions().then((_) {
+        // Assert that the CommonUsageComputer is working
+        expect(
+            suggestions.any((s) => s.relevance == DART_RELEVANCE_COMMON_USAGE),
+            isTrue);
+      });
+    }
   }
 
   Future<void> test_invocation_withTrailingStmt() {
diff --git a/pkg/analysis_server/test/domain_completion_util.dart b/pkg/analysis_server/test/domain_completion_util.dart
index 424b3d01451..81f936fb729 100644
--- a/pkg/analysis_server/test/domain_completion_util.dart
+++ b/pkg/analysis_server/test/domain_completion_util.dart
@@ -70,7 +70,9 @@ class AbstractCompletionDomainTest extends AbstractAnalysisTest {
       fail('expected $expectationText, but found\n $completions');
     }
     expect(cs.kind, equals(kind));
-    expect(cs.relevance, equals(relevance));
+    if (!server.options.useNewRelevance) {
+      expect(cs.relevance, equals(relevance));
+    }
     expect(cs.selectionOffset, selectionOffset ?? completion.length);
     expect(cs.selectionLength, equals(0));
     expect(cs.isDeprecated, equals(isDeprecated));
diff --git a/pkg/analysis_server/test/src/domains/completion/get_suggestions_available_test.dart b/pkg/analysis_server/test/src/domains/completion/get_suggestions_available_test.dart
index 805b561faa7..8053be54b6d 100644
--- a/pkg/analysis_server/test/src/domains/completion/get_suggestions_available_test.dart
+++ b/pkg/analysis_server/test/src/domains/completion/get_suggestions_available_test.dart
@@ -253,7 +253,57 @@ void f(MyEnum e) {
       testCode.indexOf(' // ref'),
     );
 
-    assertJsonText(results.includedSuggestionRelevanceTags, r'''
+    if (server.options.useNewRelevance) {
+      assertJsonText(results.includedSuggestionRelevanceTags, r'''
+[
+  {
+    "tag": "ElementKind.PREFIX",
+    "relevanceBoost": 0
+  },
+  {
+    "tag": "ElementKind.TOP_LEVEL_VARIABLE",
+    "relevanceBoost": 1
+  },
+  {
+    "tag": "ElementKind.FUNCTION",
+    "relevanceBoost": 2
+  },
+  {
+    "tag": "ElementKind.METHOD",
+    "relevanceBoost": 4
+  },
+  {
+    "tag": "ElementKind.ENUM",
+    "relevanceBoost": 9
+  },
+  {
+    "tag": "ElementKind.CLASS",
+    "relevanceBoost": 28
+  },
+  {
+    "tag": "ElementKind.LOCAL_VARIABLE",
+    "relevanceBoost": 40
+  },
+  {
+    "tag": "ElementKind.CONSTRUCTOR",
+    "relevanceBoost": 53
+  },
+  {
+    "tag": "ElementKind.FIELD",
+    "relevanceBoost": 68
+  },
+  {
+    "tag": "ElementKind.PARAMETER",
+    "relevanceBoost": 100
+  },
+  {
+    "tag": "package:test/a.dart::MyEnum",
+    "relevanceBoost": 250
+  }
+]
+''');
+    } else {
+      assertJsonText(results.includedSuggestionRelevanceTags, r'''
 [
   {
     "tag": "package:test/a.dart::MyEnum",
@@ -261,6 +311,7 @@ void f(MyEnum e) {
   }
 ]
 ''');
+    }
   }
 
   Future<void> test_relevanceTags_location_argumentList_named() async {
@@ -277,7 +328,57 @@ main() {
       testCode.indexOf('); // ref'),
     );
 
-    assertJsonText(results.includedSuggestionRelevanceTags, r'''
+    if (server.options.useNewRelevance) {
+      assertJsonText(results.includedSuggestionRelevanceTags, r'''
+[
+  {
+    "tag": "ElementKind.PREFIX",
+    "relevanceBoost": 0
+  },
+  {
+    "tag": "ElementKind.FUNCTION",
+    "relevanceBoost": 1
+  },
+  {
+    "tag": "ElementKind.METHOD",
+    "relevanceBoost": 1
+  },
+  {
+    "tag": "ElementKind.TOP_LEVEL_VARIABLE",
+    "relevanceBoost": 3
+  },
+  {
+    "tag": "ElementKind.ENUM",
+    "relevanceBoost": 5
+  },
+  {
+    "tag": "ElementKind.CLASS",
+    "relevanceBoost": 20
+  },
+  {
+    "tag": "ElementKind.LOCAL_VARIABLE",
+    "relevanceBoost": 30
+  },
+  {
+    "tag": "ElementKind.FIELD",
+    "relevanceBoost": 41
+  },
+  {
+    "tag": "ElementKind.PARAMETER",
+    "relevanceBoost": 56
+  },
+  {
+    "tag": "ElementKind.CONSTRUCTOR",
+    "relevanceBoost": 100
+  },
+  {
+    "tag": "dart:core::String",
+    "relevanceBoost": 10
+  }
+]
+''');
+    } else {
+      assertJsonText(results.includedSuggestionRelevanceTags, r'''
 [
   {
     "tag": "dart:core::String",
@@ -285,6 +386,7 @@ main() {
   }
 ]
 ''');
+    }
   }
 
   Future<void> test_relevanceTags_location_argumentList_positional() async {
@@ -301,7 +403,65 @@ main() {
       testCode.indexOf('); // ref'),
     );
 
-    assertJsonText(results.includedSuggestionRelevanceTags, r'''
+    if (server.options.useNewRelevance) {
+      assertJsonText(results.includedSuggestionRelevanceTags, r'''
+[
+  {
+    "tag": "ElementKind.MIXIN",
+    "relevanceBoost": 0
+  },
+  {
+    "tag": "ElementKind.TYPE_PARAMETER",
+    "relevanceBoost": 0
+  },
+  {
+    "tag": "ElementKind.PREFIX",
+    "relevanceBoost": 0
+  },
+  {
+    "tag": "ElementKind.ENUM",
+    "relevanceBoost": 3
+  },
+  {
+    "tag": "ElementKind.METHOD",
+    "relevanceBoost": 4
+  },
+  {
+    "tag": "ElementKind.FUNCTION",
+    "relevanceBoost": 9
+  },
+  {
+    "tag": "ElementKind.CLASS",
+    "relevanceBoost": 13
+  },
+  {
+    "tag": "ElementKind.TOP_LEVEL_VARIABLE",
+    "relevanceBoost": 18
+  },
+  {
+    "tag": "ElementKind.CONSTRUCTOR",
+    "relevanceBoost": 27
+  },
+  {
+    "tag": "ElementKind.FIELD",
+    "relevanceBoost": 42
+  },
+  {
+    "tag": "ElementKind.LOCAL_VARIABLE",
+    "relevanceBoost": 60
+  },
+  {
+    "tag": "ElementKind.PARAMETER",
+    "relevanceBoost": 100
+  },
+  {
+    "tag": "dart:core::double",
+    "relevanceBoost": 10
+  }
+]
+''');
+    } else {
+      assertJsonText(results.includedSuggestionRelevanceTags, r'''
 [
   {
     "tag": "dart:core::double",
@@ -309,6 +469,7 @@ main() {
   }
 ]
 ''');
+    }
   }
 
   Future<void> test_relevanceTags_location_assignment() async {
@@ -324,7 +485,57 @@ main() {
       testCode.indexOf(' // ref'),
     );
 
-    assertJsonText(results.includedSuggestionRelevanceTags, r'''
+    if (server.options.useNewRelevance) {
+      assertJsonText(results.includedSuggestionRelevanceTags, r'''
+[
+  {
+    "tag": "ElementKind.PREFIX",
+    "relevanceBoost": 0
+  },
+  {
+    "tag": "ElementKind.TOP_LEVEL_VARIABLE",
+    "relevanceBoost": 1
+  },
+  {
+    "tag": "ElementKind.FUNCTION",
+    "relevanceBoost": 2
+  },
+  {
+    "tag": "ElementKind.METHOD",
+    "relevanceBoost": 4
+  },
+  {
+    "tag": "ElementKind.ENUM",
+    "relevanceBoost": 9
+  },
+  {
+    "tag": "ElementKind.CLASS",
+    "relevanceBoost": 28
+  },
+  {
+    "tag": "ElementKind.LOCAL_VARIABLE",
+    "relevanceBoost": 40
+  },
+  {
+    "tag": "ElementKind.CONSTRUCTOR",
+    "relevanceBoost": 53
+  },
+  {
+    "tag": "ElementKind.FIELD",
+    "relevanceBoost": 68
+  },
+  {
+    "tag": "ElementKind.PARAMETER",
+    "relevanceBoost": 100
+  },
+  {
+    "tag": "dart:core::int",
+    "relevanceBoost": 10
+  }
+]
+''');
+    } else {
+      assertJsonText(results.includedSuggestionRelevanceTags, r'''
 [
   {
     "tag": "dart:core::int",
@@ -332,6 +543,7 @@ main() {
   }
 ]
 ''');
+    }
   }
 
   Future<void> test_relevanceTags_location_initializer() async {
@@ -344,7 +556,65 @@ int v = // ref;
       testCode.indexOf(' // ref'),
     );
 
-    assertJsonText(results.includedSuggestionRelevanceTags, r'''
+    if (server.options.useNewRelevance) {
+      assertJsonText(results.includedSuggestionRelevanceTags, r'''
+[
+  {
+    "tag": "ElementKind.MIXIN",
+    "relevanceBoost": 0
+  },
+  {
+    "tag": "ElementKind.TYPE_PARAMETER",
+    "relevanceBoost": 0
+  },
+  {
+    "tag": "ElementKind.PREFIX",
+    "relevanceBoost": 1
+  },
+  {
+    "tag": "ElementKind.ENUM",
+    "relevanceBoost": 1
+  },
+  {
+    "tag": "ElementKind.METHOD",
+    "relevanceBoost": 4
+  },
+  {
+    "tag": "ElementKind.TOP_LEVEL_VARIABLE",
+    "relevanceBoost": 6
+  },
+  {
+    "tag": "ElementKind.FUNCTION",
+    "relevanceBoost": 16
+  },
+  {
+    "tag": "ElementKind.PARAMETER",
+    "relevanceBoost": 26
+  },
+  {
+    "tag": "ElementKind.FIELD",
+    "relevanceBoost": 35
+  },
+  {
+    "tag": "ElementKind.CLASS",
+    "relevanceBoost": 56
+  },
+  {
+    "tag": "ElementKind.LOCAL_VARIABLE",
+    "relevanceBoost": 68
+  },
+  {
+    "tag": "ElementKind.CONSTRUCTOR",
+    "relevanceBoost": 100
+  },
+  {
+    "tag": "dart:core::int",
+    "relevanceBoost": 10
+  }
+]
+''');
+    } else {
+      assertJsonText(results.includedSuggestionRelevanceTags, r'''
 [
   {
     "tag": "dart:core::int",
@@ -352,6 +622,7 @@ int v = // ref;
   }
 ]
 ''');
+    }
   }
 
   Future<void> test_relevanceTags_location_listLiteral() async {