# Vercel switches Workflow SDK writes to WebSockets

_Published Tuesday, November 10, 2026 at 3:08 AM EST · Infrastructure · Latest · Tier 2 — Notable_

![Vercel switches Workflow SDK writes to WebSockets — Primary](https://assets.vercel.com/image/upload/contentful/image/e5382hct74si/27da8pLzXd8AyEJK20xjUJ/e77075b2ad88245b75447ec57aaa4da4/image__5_.png)

Vercel's Workflow SDK now sends event and stream writes over a WebSocket by default, replacing separate HTTP requests. Developers enable the change by upgrading to workflow@5.2.0 or later and deploying; existing streaming code requires no changes.

Vercel says a benchmark replaying an AI agent's token stream delivered the full response 4.2× faster than v4.8.12, with no chunk delayed over a second. Step starts and completions also use the connection, reducing HTTP requests for workflows with many steps. New runs use the upgrade, while in-flight runs finish on their original deployment.

## Sources

- [Vercel News](https://vercel.com/changelog/workflow-writes-now-use-websockets-on-vercel)

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Canonical: https://techandbusiness.org/newswire/M8EQ-HZLSsPdTBqaPPzB-p
Published: 2026-11-10T08:08:41.564Z
Story chronology: 2026-11-09T00:00:00.000Z
Retrieved: 2026-11-10T11:18:03.133Z
Publisher: Tech & Business (techandbusiness.org)