AI BriefingBun Runtime Now Supports Large Functions and Extended Max Duration
Key point
Vercel's Bun runtime now supports large functions up to 5GB and a maximum execution time of 30 minutes.
Details
The Bun runtime for Vercel Functions now supports large package sizes up to 5GB (uncompressed) and extended execution times up to 30 minutes (1800 seconds). These two beta features, previously available only for Node.js and Python, are now also supported by Bun.
Large functions increase the standard 250MB package size limit to 5GB. Extended max duration raises the typical 800-second cap to 1800 seconds for Pro and Enterprise teams. Both features require Fluid compute to be enabled.
New projects are automatically enrolled in the large functions beta. Existing projects created before July 2026 must add VERCEL_SUPPORT_LARGE_FUNCTIONS=1 to the environment variables in the project settings and redeploy. Execution times exceeding 800 seconds must be configured per function in the vercel.json file, rather than as a project-wide default.
During the beta period, these features are unavailable for projects using Secure Compute or Static IPs.
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