Vercel Sandbox Doubles Disk to 64 GB of Ephemeral NVMe Storage — and It's Free

Every Vercel Sandbox now ships with 64 GB of ephemeral NVMe disk, up from 32 GB. The catch the changelog buries: the upgrade only applies to sandboxes created with Sandbox SDK 3.0.0 or above or from a custom image. Sandboxes using the deprecated runtime property stay at 32 GB.

What shipped

Vercel doubled the default disk from 32 GB to 64 GB on September 11, 2026. The quota table in the pricing docs confirms it's uniform across plans: Hobby, Pro, and Enterprise all get 64 GB. Vercel frames it as headroom for large repos, dependency trees, build artifacts, and agent workloads that spill data to disk.

What changed — and what it costs

Here's the number that matters: ephemeral disk is not a billed metric. Sandbox billing covers Active CPU ($0.128/hr in iad1), Provisioned Memory ($0.0212/GB-hr), Creations ($0.60/1M), Data Transfer ($0.15/GB), Snapshot Storage ($0.08/GB-month), and Drive Storage ($0.05/GB-month). The 64 GB NVMe slice appears on none of those lines. That makes the included ephemeral disk 4.3× larger than the 15 GB lifetime Drive Storage included in the free quota — but persistence is where you pay: snapshots bill at $0.08/GB-month and drives at $0.05/GB-month, both measured hourly on actual usage.

So the real win is for short-lived, disk-heavy work: a build or agent run can fill 64 GB for the cost of CPU time alone. The deprecated-runtime carve-out is the migration nudge — if you're still on the old runtime property, you're leaving 32 GB on the table until you move to SDK 3.0.0 or a custom image.

Why a builder cares

Agent infrastructure is converging on "ephemeral compute is cheap, durability is the bill." This doubling widens that gap: 2× the scratch space at zero marginal cost, while anything you want to survive a session keeps billing per GB-month. Design your agent pipelines to spill freely and snapshot selectively — that's the cost model Vercel is pushing you toward.