Bun runtime now supports large functions and extended max duration
Vercel Functions on Bun runtime now support larger package sizes up to 5GB uncompressed and extended max duration up to 30 minutes (1800 seconds) for Pro and Enterprise teams. These features previously were only available on Node.js and Python runtimes.
The on Vercel Functions now supports larger package sizes up to 5GB uncompressed and extended max duration for up to 30 minutes, two betas that previously ran on Node.js and Python only.Bun runtime
Large functions raise the standard 250MB package size limit to 5GB, and extended max duration raises the generally available 800-second ceiling to 1800 seconds for Pro and Enterprise teams. Both features require to be enabled. New projects are enrolled in the large functions beta automatically, while existing projects created before opt in by adding as an , then redeploying. Durations above 800 seconds are set per function in rather than as a project-level default:Fluid computeenvironment variable in your project settingsJuly 2026VERCEL_SUPPORT_LARGE_FUNCTIONS=1vercel.json
The entry point serves the long-running route with Bun:server.ts
During the beta, these features are unavailable on projects using Secure Compute or Static IPs.
Read the and documentation.large functionsextended max duration
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