Auto-suspend

Auto-suspend is off by default on new machines (they stay up and cost at most the monthly cap). Turn it on at creation or later on the machine page.

When a machine suspends

Once on, a machine suspends after 20 minutes (configurable) of all three at once:

no established connections (in or out — e.g. SSH sessions, Claude Code’s connection to the model);
a nearly idle CPU;
almost no network traffic.

If any one fails, it stays up; missing data counts as “in use”.

What happens while suspended

The machine’s memory is written to the encrypted disk, the physical RAM goes back to the server and the encryption key leaves memory. While suspended you pay only the base fee, no hourly fee.

Waking it

Just SSH in or hit a mapped port: when the connection arrives we start the machine in the background and forward it — about 10 extra seconds. Processes, open files and in-memory data are all still there.

You can also suspend immediately from inside the machine: hangar hibernate.