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Every trial runs in its own sandbox on one of three providers. Pick the provider per job with -e; the default is daytona. Once chosen, the provider is fixed for the job’s life, and a resumed job inherits it.

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Which tasks run where

Not every task can run on every provider, and the catalog says so before any money is spent. evolve dataset show lists a verdict per provider for every task.
A verdict is ok, or refused with a reason. A GPU task carries a third form: ok with a note that the trial degrades to modal, the provider that reserves GPUs. Starting a job whose selected tasks include one that is refused on the chosen provider is rejected at creation with provider_unsupported, so nothing is spent on a trial that cannot execute. Three refusals appear in the verdicts: multi-container tasks run on e2b and daytona only; a multi-container task under no-network runs nowhere, so declare allowlist or public; and a size above a provider’s ceiling refuses on that provider. Two limits show only when the sandbox is created, as an INFRASTRUCTURE_ERROR with the reason in the trial’s failure detail. On daytona an allowlist holds one kind of entry: IP addresses and CIDRs for a single-container task (at most 10), hostnames for a multi-container task (at most 20, *. covering a domain). e2b and modal take both kinds. Each provider keeps a box alive for at most its own plan’s lifetime, 24 hours on e2b and modal. A timeout stretched past it fails the trial.

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GPU tasks

A task declares gpus and gpu_types in [environment]; gpu_types null means any type. GPU compute is paid by the platform; a GPU trial draws your credits for its model calls only. modal is the provider that reserves GPUs today, so a GPU task runs on modal whatever the job picked, and the trial records the move in sandbox_provider_degrade. A queued GPU trial past the fleet’s gpu_concurrency_cap waits; a GPU count above modal’s ceiling is refused at import. Every settled GPU trial states its compute as an estimate, gpu_cost, from the sandbox’s lifetime at the provider’s list price. It is a separate figure, never added to the model spend; the job sums it as stats.gpu_cost_usd. evolve trial show prints it as gpu compute (est.), and unpriced_reason says why when no honest number exists.

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The analyzer’s and the checker’s sandbox

Trace analysis and task checks run in sandboxes too. -e on evolve analyze and on evolve check, and --analyze-provider on evolve run, pick the provider. Omitted, the platform’s analysis default applies, daytona.