Vercel lifts Sandbox concurrency fivefold

Vercel raised its default Sandbox limit fivefold, from 2,000 to 10,000 concurrent sandboxes, for Pro and Enterprise teams. The new dynamic quota starts at 150 vCPUs per minute, adds 500 with sustained creation, and tops out at 5,000—versus the former fixed rates of 200 for Pro and 400 for Enterprise. Teams scaling the browser-agent transport stack beyond model latency should file this as headroom, not a free pass: fleet tests still need queue, cost, and cleanup limits of their own.