From d30bbb2e0b420b9e549c022d875700caba784cd7 Mon Sep 17 00:00:00 2001
From: "mintlify[bot]" <109931778+mintlify[bot]@users.noreply.github.com>
Date: Mon, 7 Sep 2026 02:14:35 +0000
Subject: [PATCH] docs: add Sep 7 changelog entry for streaming latency and
 auth updates

---
 changelog.mdx | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/changelog.mdx b/changelog.mdx
index b965396ee..fa28fc82c 100644
--- a/changelog.mdx
+++ b/changelog.mdx
@@ -7,6 +7,16 @@ keywords: ["changelog", "API updates", "release notes", "what's new", "API chang
 
 To subscribe to updates, please [**“Turn on notifications”**](https://help.x.com/en/managing-your-account/notifications-on-mobile-devices#:~:text=In%20the%20top%20menu,%20you,you%20would%20like%20to%20receive) for [**@API**](https://x.com/api). You can also follow this changelog in your feed reader via the [**RSS feed**](https://docs.x.com/changelog/rss.xml).
 
+<Update label="Sep 7, 2026" description="X API v2">
+  ### Faster streaming delivery
+
+  We reduced the P99 latency of our hydrated streaming endpoints, including [Filtered Stream](/x-api/posts/filtered-stream/introduction), from approximately 6-7 seconds to approximately 4-5 seconds. Matching Posts now reach your stream sooner, with no changes required on your side. For the lowest-latency option, see [Powerstream](/x-api/powerstream/introduction). Learn more about [consuming streaming data](/x-api/fundamentals/consuming-streaming-data).
+
+  ### User-context authentication for webhook and subscription management
+
+  The [webhook management endpoints](/x-api/webhooks/introduction) (`GET` and `POST /2/webhooks`, `PUT` and `DELETE /2/webhooks/{webhook_id}`) and the X Activity API subscription [update](/x-api/activity/update-x-activity-subscription) and [delete](/x-api/activity/deletes-x-activity-subscription) endpoints now accept OAuth 2.0 user context and OAuth 1.0a user context authentication, in addition to app-only Bearer tokens. You can now manage webhooks and subscriptions with the same user-context credentials your app already uses.
+</Update>
+
 <Update label="Sep 1, 2026" description="X API v2">
   ### Media upload and Post-create size and duration limits