AI BriefingVercel Workflow SDK v5.2.0 switches to WebSocket writes for 4.2x faster streaming
·2026.11.09 09:00
Key point
Upgrading to [email protected] replaces per-write HTTP requests with a single WebSocket connection, reducing latency and costs for multi-step workflows.
Details
- Workflow SDK v5.2.0 sends event and stream writes to Vercel Workflows over a WebSocket by default, replacing one HTTP request per write or write group.
- In a benchmark replaying an AI agent's token stream, v5.2.0 delivered the full response 4.2x faster than v4.8.12, with no chunk delayed over a second.
- Existing streaming code works without changes; a step writing a burst of chunks, such as AI tokens, sends them over the WebSocket once it opens.
- Every step start and completion is an event write sent over the WebSocket, reducing HTTP requests for workflows with many steps.
- No code change is needed beyond upgrading to [email protected] or later; new runs use the WebSocket after deployment, while in-flight runs finish on their original deployment.
- Users on version 4.x should consult the upgrade guide, as v5 is a major release.
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