Bun runtime now supports large functions and extended max duration
By Steven Van ·
The Bun runtime on Vercel Functions now supports larger package sizes up to 5GB uncompressed and extended max duration for up to 30 minutes, two betas…
Vercel's Bun runtime now supports large functions and extended max duration, two betas that previously ran on Node.js and Python only.
- Large functions raise the standard 250MB package size limit to 5GB uncompressed.
- Extended max duration raises the generally available 800-second ceiling to 1800 seconds (30 minutes) for Pro and Enterprise teams, set per function in vercel.json rather than as a project-level default.
Both features require Fluid compute to be enabled. New projects are enrolled in the large functions beta automatically; existing projects created before July 2026 opt in by adding VERCEL_SUPPORT_LARGE_FUNCTIONS=1 as an environment variable and redeploying. During the beta, neither feature is available on projects using Secure Compute or Static IPs. Full details are in the announcement.
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