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Draft changelog: streaming latency and new auth options #384

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16 changes: 16 additions & 0 deletions changelog.mdx
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Expand Up @@ -7,6 +7,22 @@ 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 5, 2026" description="X API v2">
### Lower streaming latency: P99 now ~4-5 seconds

We improved delivery latency across the X API v2 volume streaming endpoints, including the [Filtered Stream](/x-api/posts/filtered-stream/introduction). P99 latency is now approximately **4-5 seconds**, down from ~6-7 seconds. No changes are required on your side. See [consuming streaming data](/x-api/fundamentals/consuming-streaming-data) for delivery guarantees, or [Powerstream](/x-api/powerstream/introduction) if you need the lowest possible latency.

### More authentication options for webhooks and X Activity API subscriptions

We expanded the authentication methods accepted by the [webhooks](/x-api/webhooks/introduction) and [X Activity API](/x-api/activity/introduction) management endpoints:

- `POST /2/webhooks`, `PUT /2/webhooks/{webhook_id}`, and `DELETE /2/webhooks/{webhook_id}` now accept OAuth 2.0 user context in addition to OAuth 1.0a and app-only Bearer Token.
- `GET /2/webhooks` now accepts OAuth 2.0 and OAuth 1.0a user context. It was previously app-only.
- `PUT /2/activity/subscriptions/{subscription_id}` and `DELETE /2/activity/subscriptions/{subscription_id}` now accept OAuth 2.0 and OAuth 1.0a user context in addition to app-only Bearer Token.

You can now manage webhooks and X Activity API subscriptions with the same user-context credentials your app already uses elsewhere.
</Update>

<Update label="Sep 1, 2026" description="X API v2">
### Media upload and Post-create size and duration limits

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