Twenty hours. Your agent’s first sandboxes.

Every new account gets 20 hours of sandbox time after a verified sign-in, with no card.

• Up to three sandboxes at once, each up to 2 vCPU and 4 GiB of memory, with up to 10 GiB of disk (4 GiB by default) and shared CPU.
• The 20 hours are shared across all your trial sandboxes and sessions. Running time counts, idle or busy; time while a sandbox is paused or stopped does not.
• Each session can last up to one hour; the server enforces timeoutSeconds of at most 3600. Extend a running sandbox or wake a paused one to keep going, within the time you have left.
• Model calls, persistent storage and paid features are not included.

Use a region listed for your account. Leave region out for the default. Tell your agent:

Read https://withruntime.com/docs/trial.md and https://withruntime.com/docs/start.md. Try my workload with funding: "trial" (CLI: --trial), check its output and exit code, and stop the sandbox even if it fails. Do not switch to paid funding without asking me.

You do not have to ask for the trial: create() with no funding uses it while you have trial time left, sized to fit. Name funding: "trial" to insist on it; a trial request never falls back to paid credit, even when the account has some. If you omit funding after the trial is exhausted, available prepaid credit can be used instead.

Over HTTP, a trial create is POST /v1/sandboxes. This body names the defaults; only funding needs to be there:

Time is reserved when a sandbox starts and settled from its confirmed running time when it ends, so stopping early gives the unused part back. Read what is left with npx withruntime usage (or GET /v1/usage): trial.totalMs, trial.usedMs, trial.reservedMs and trial.availableMs, in milliseconds, apart from dollars.

When three trial sandboxes are running or paused, a fourth is refused with trial_busy, naming the three. Stop one first. Requests sent at the same moment are admitted in no set order, so any one of them may be the one refused; retry it after stopping a sandbox or once one has ended. When the time is used up, new trial sandboxes are refused with trial_exhausted. Free time cannot be cashed out, refunded or replenished by signing in again. To continue with paid compute, an account owner can add prepaid credit at Usage & billing, then explicitly choose paid funding. Read pricing first.

At the standard rates, 20 fully busy hours of a 2 vCPU, 4 GiB sandbox would cost $1.60 in compute. See pricing and, for what the sandbox may reach, security.