diff --git a/apps/admin-x-activitypub/src/components/feed/ArticleModal.tsx b/apps/admin-x-activitypub/src/components/feed/ArticleModal.tsx
index b045689616..13cc3d6e47 100644
--- a/apps/admin-x-activitypub/src/components/feed/ArticleModal.tsx
+++ b/apps/admin-x-activitypub/src/components/feed/ArticleModal.tsx
@@ -78,6 +78,7 @@ const FeedItemDivider: React.FC = () => (
 const ArticleModal: React.FC<ArticleModalProps> = ({object, actor, comments, allComments, focusReply}) => {
     const MODAL_SIZE_SM = 640;
     const MODAL_SIZE_LG = 2800;
+    const [commentsState, setCommentsState] = useState(comments);
     const [isFocused, setFocused] = useState(focusReply ? 1 : 0);
     function setReplyBoxFocused(focused: boolean) {
         if (focused) {
@@ -114,7 +115,7 @@ const ArticleModal: React.FC<ArticleModalProps> = ({object, actor, comments, all
     };
     const navigateForward = (nextObject: ObjectProperties, nextActor: ActorProperties, nextComments: Activity[]) => {
         setCanNavigateBack(true);
-        setNavigationStack([...navigationStack, [object, actor, comments]]);
+        setNavigationStack([...navigationStack, [object, actor, commentsState]]);
 
         modal.show({
             object: nextObject,
@@ -127,6 +128,10 @@ const ArticleModal: React.FC<ArticleModalProps> = ({object, actor, comments, all
         setModalSize(modalSize === MODAL_SIZE_SM ? MODAL_SIZE_LG : MODAL_SIZE_SM);
     };
 
+    function handleNewReply(activity: Activity) {
+        setCommentsState(prev => [activity].concat(prev));
+    }
+
     return (
         <Modal
             align='right'
@@ -164,7 +169,7 @@ const ArticleModal: React.FC<ArticleModalProps> = ({object, actor, comments, all
                                 setReplyBoxFocused(true);
                             }}
                         />
-                        <APReplyBox focused={isFocused} object={object}/>
+                        <APReplyBox focused={isFocused} object={object} onNewReply={handleNewReply}/>
                         <FeedItemDivider />
 
                         {/* {object.content && <div dangerouslySetInnerHTML={({__html: object.content})} className='ap-note-content text-pretty text-[1.5rem] text-grey-900'></div>} */}
@@ -175,8 +180,8 @@ const ArticleModal: React.FC<ArticleModalProps> = ({object, actor, comments, all
                         <FeedItem actor={actor} last={false} layout='reply' object={object} type='Note'/>
                         <FeedItem actor={actor} last={false} layout='reply' object={object} type='Note'/>
                         <FeedItem actor={actor} last={true} layout='reply' object={object} type='Note'/> */}
-                        {comments.map((comment, index) => {
-                            const showDivider = index !== comments.length - 1;
+                        {commentsState.map((comment, index) => {
+                            const showDivider = index !== commentsState.length - 1;
                             const nestedComments = allComments.get(comment.object.id) ?? [];
                             const hasNestedComments = nestedComments.length > 0;
 
diff --git a/apps/admin-x-activitypub/src/components/global/APReplyBox.tsx b/apps/admin-x-activitypub/src/components/global/APReplyBox.tsx
index 3674c6279e..4624ab7210 100644
--- a/apps/admin-x-activitypub/src/components/global/APReplyBox.tsx
+++ b/apps/admin-x-activitypub/src/components/global/APReplyBox.tsx
@@ -2,6 +2,7 @@ import React, {HTMLProps, useEffect, useId, useRef, useState} from 'react';
 
 import * as FormPrimitive from '@radix-ui/react-form';
 import APAvatar from './APAvatar';
+import Activity from '../activities/ActivityItem';
 import clsx from 'clsx';
 import getUsername from '../../utils/get-username';
 import {Button, showToast} from '@tryghost/admin-x-design-system';
@@ -18,6 +19,7 @@ export interface APTextAreaProps extends HTMLProps<HTMLTextAreaElement> {
     hint?: React.ReactNode;
     className?: string;
     onChange?: (event: React.ChangeEvent<HTMLTextAreaElement>) => void;
+    onNewReply?: (activity: Activity) => void;
     object: ObjectProperties;
     focused: number;
 }
@@ -32,6 +34,7 @@ const APReplyBox: React.FC<APTextAreaProps> = ({
     className,
     object,
     focused,
+    onNewReply,
     // onChange,
     // onFocus,
     // onBlur,
@@ -61,12 +64,13 @@ const APReplyBox: React.FC<APTextAreaProps> = ({
     async function handleClick(event: React.MouseEvent) {
         event.preventDefault();
         await replyMutation.mutate({id: object.id, content: textValue}, {
-            onSuccess() {
+            onSuccess(activity) {
                 setTextValue('');
                 showToast({
                     message: 'Reply sent',
                     type: 'success'
                 });
+                onNewReply(activity);
             }
         });
     }