diff --git a/src/cdk-experimental/radio-group/radio-group.spec.ts b/src/cdk-experimental/radio-group/radio-group.spec.ts
index ac2639fbf84a..d630fb18c41e 100644
--- a/src/cdk-experimental/radio-group/radio-group.spec.ts
+++ b/src/cdk-experimental/radio-group/radio-group.spec.ts
@@ -117,9 +117,9 @@ describe('CdkRadioGroup', () => {
         });
       });
 
-      it('should set aria-orientation to "vertical"', () => {
+      it('should set aria-orientation to "horizontal"', () => {
         setupDefaultRadioGroup();
-        expect(radioGroupElement.getAttribute('aria-orientation')).toBe('vertical');
+        expect(radioGroupElement.getAttribute('aria-orientation')).toBe('horizontal');
       });
 
       it('should set aria-disabled to false', () => {
diff --git a/src/cdk-experimental/radio-group/radio-group.ts b/src/cdk-experimental/radio-group/radio-group.ts
index ba9586a83a7f..c164624c7ef7 100644
--- a/src/cdk-experimental/radio-group/radio-group.ts
+++ b/src/cdk-experimental/radio-group/radio-group.ts
@@ -109,7 +109,7 @@ export class CdkRadioGroup<V> {
   protected items = computed(() => this._cdkRadioButtons().map(radio => radio.pattern));
 
   /** Whether the radio group is vertically or horizontally oriented. */
-  orientation = input<'vertical' | 'horizontal'>('vertical');
+  orientation = input<'vertical' | 'horizontal'>('horizontal');
 
   /** Whether disabled items in the group should be skipped when navigating. */
   skipDisabled = input(true, {transform: booleanAttribute});
diff --git a/src/components-examples/cdk-experimental/radio-group/cdk-radio-group-horizontal/cdk-radio-group-horizontal-example.html b/src/components-examples/cdk-experimental/radio-group/cdk-radio-group-horizontal/cdk-radio-group-horizontal-example.html
index 738702c92156..14e442304f1d 100644
--- a/src/components-examples/cdk-experimental/radio-group/cdk-radio-group-horizontal/cdk-radio-group-horizontal-example.html
+++ b/src/components-examples/cdk-experimental/radio-group/cdk-radio-group-horizontal/cdk-radio-group-horizontal-example.html
@@ -1,11 +1,11 @@
 <div class="example-container">
   <ul
     cdkRadioGroup
-    orientation="horizontal"
-    class="example-radio-group example-radio-group-horizontal example-parent"
-    aria-labelledby="horizontal-radio-label"
+    orientation="vertical"
+    class="example-radio-group example-parent"
+    aria-labelledby="vertical-radio-label"
   >
-    <label class="example-label" id="horizontal-radio-label">Favorite Fruit (Horizontal)</label>
+    <label class="example-label" id="vertical-radio-label">Favorite Fruit (Vertical)</label>
     @for (fruit of fruits; track fruit) {
       <li
         class="example-radio-button example-stateful example-selectable"
diff --git a/src/components-examples/cdk-experimental/radio-group/radio-common.css b/src/components-examples/cdk-experimental/radio-group/radio-common.css
index 6d4d6c4c36b4..74f8c360015f 100644
--- a/src/components-examples/cdk-experimental/radio-group/radio-common.css
+++ b/src/components-examples/cdk-experimental/radio-group/radio-common.css
@@ -38,6 +38,7 @@
   cursor: pointer;
   position: relative;
   align-items: center;
+  flex-shrink: 0;
   border-radius: var(--mat-sys-corner-extra-small);
 }
 
diff --git a/src/dev-app/cdk-experimental-radio-group/cdk-radio-group-demo.html b/src/dev-app/cdk-experimental-radio-group/cdk-radio-group-demo.html
index be2789cf993c..15b9c132d723 100644
--- a/src/dev-app/cdk-experimental-radio-group/cdk-radio-group-demo.html
+++ b/src/dev-app/cdk-experimental-radio-group/cdk-radio-group-demo.html
@@ -6,7 +6,7 @@ <h4>Standard</h4>
     </div>
 
     <div class="example-radio-container">
-      <h4>Horizontal Orientation</h4>
+      <h4>Vertical Orientation</h4>
       <cdk-radio-group-horizontal-example></cdk-radio-group-horizontal-example>
     </div>