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Draft changelog: streaming latency and new auth options #390

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8 changes: 8 additions & 0 deletions changelog.mdx
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Expand Up @@ -7,6 +7,14 @@ 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">
### Lower streaming latency and new authentication options

- **Faster streaming delivery**: [X API v2 streaming endpoints](/x-api/fundamentals/consuming-streaming-data) now deliver hydrated Post data with a P99 latency of approximately **4-5 seconds**, down from 6-7 seconds. This includes [filtered stream](/x-api/posts/filtered-stream/introduction). If you need the lowest possible latency, use [Powerstream](/x-api/powerstream/introduction).
- **OAuth 2.0 user context for webhooks**: The [webhooks management endpoints](/x-api/webhooks/introduction) (`GET` and `POST /2/webhooks`, `PUT` and `DELETE /2/webhooks/:webhook_id`) now accept OAuth 2.0 user context authentication. `GET /2/webhooks` also now accepts OAuth 1.0a user context.
- **More authentication options for X Activity API subscriptions**: `PUT` and `DELETE /2/activity/subscriptions/:subscription_id` now accept OAuth 1.0a and OAuth 2.0 user context in addition to the app-only Bearer Token. See the [X Activity API](/x-api/activity/introduction).
</Update>

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

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