diff --git a/src/structures/ThreadChannel.js b/src/structures/ThreadChannel.js
index ea19d7274d0a..420a4163d54d 100644
--- a/src/structures/ThreadChannel.js
+++ b/src/structures/ThreadChannel.js
@@ -415,7 +415,9 @@ class ThreadChannel extends Channel {
    * @readonly
    */
   get editable() {
-    return (this.ownerId === this.client.user.id && (this.type !== 'private_thread' || this.joined)) || this.manageable;
+    return (
+      (this.ownerId === this.client.user.id && (this.type !== 'GUILD_PRIVATE_THREAD' || this.joined)) || this.manageable
+    );
   }
 
   /**
@@ -450,17 +452,10 @@ class ThreadChannel extends Channel {
    */
   get sendable() {
     return (
-      !this.archived &&
-      (this.type !== 'private_thread' || this.joined || this.manageable) &&
-      this.permissionsFor(this.client.user)?.any(
-        [
-          Permissions.FLAGS.SEND_MESSAGES,
-          this.type === 'GUILD_PRIVATE_THREAD'
-            ? Permissions.FLAGS.USE_PRIVATE_THREADS
-            : Permissions.FLAGS.USE_PUBLIC_THREADS,
-        ],
-        false,
-      )
+      (!(this.archived && this.locked && !this.manageable) &&
+        (this.type !== 'GUILD_PRIVATE_THREAD' || this.joined || this.manageable) &&
+        this.permissionsFor(this.client.user)?.has(Permissions.FLAGS.SEND_MESSAGES_IN_THREADS, false)) ??
+      false
     );
   }
 
diff --git a/src/util/Permissions.js b/src/util/Permissions.js
index 3f814c710fcc..b59497fd0ba7 100644
--- a/src/util/Permissions.js
+++ b/src/util/Permissions.js
@@ -91,9 +91,12 @@ class Permissions extends BitField {
  * * `USE_APPLICATION_COMMANDS`
  * * `REQUEST_TO_SPEAK`
  * * `MANAGE_THREADS`
- * * `USE_PUBLIC_THREADS`
- * * `USE_PRIVATE_THREADS`
+ * * `USE_PUBLIC_THREADS` (deprecated)
+ * * `CREATE_PUBLIC_THREADS`
+ * * `USE_PRIVATE_THREADS` (deprecated)
+ * * `CREATE_PRIVATE_THREADS`
  * * `USE_EXTERNAL_STICKERS` (use stickers from different guilds)
+ * * `SEND_MESSAGES_IN_THREADS`
  * * `START_EMBEDDED_ACTIVITIES`
  * @type {Object<string, bigint>}
  * @see {@link https://discord.com/developers/docs/topics/permissions#permissions-bitwise-permission-flags}
@@ -133,9 +136,13 @@ Permissions.FLAGS = {
   USE_APPLICATION_COMMANDS: 1n << 31n,
   REQUEST_TO_SPEAK: 1n << 32n,
   MANAGE_THREADS: 1n << 34n,
+  // TODO: Remove deprecated USE_*_THREADS flags in v14
   USE_PUBLIC_THREADS: 1n << 35n,
+  CREATE_PUBLIC_THREADS: 1n << 35n,
   USE_PRIVATE_THREADS: 1n << 36n,
+  CREATE_PRIVATE_THREADS: 1n << 36n,
   USE_EXTERNAL_STICKERS: 1n << 37n,
+  SEND_MESSAGES_IN_THREADS: 1n << 38n,
   START_EMBEDDED_ACTIVITIES: 1n << 39n,
 };
 
diff --git a/typings/index.d.ts b/typings/index.d.ts
index bb8e8293e706..576f5c0f1999 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -4534,8 +4534,11 @@ export type PermissionString =
   | 'REQUEST_TO_SPEAK'
   | 'MANAGE_THREADS'
   | 'USE_PUBLIC_THREADS'
+  | 'CREATE_PUBLIC_THREADS'
   | 'USE_PRIVATE_THREADS'
+  | 'CREATE_PRIVATE_THREADS'
   | 'USE_EXTERNAL_STICKERS'
+  | 'SEND_MESSAGES_IN_THREADS'
   | 'START_EMBEDDED_ACTIVITIES';
 
 export type RecursiveArray<T> = ReadonlyArray<T | RecursiveArray<T>>;