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Region

Sandboxes run in AWS us-east-1 (N. Virginia). The API, the dashboard and live view are served from the same region. Coming soon: more regions.

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Plan limits

Preview values. They will change before general availability.
What the gateway answers when you hit one: Per-sandbox size limits, per-minute create rates and request rates exist in the plans but are not enforced by the gateway yet. Sandbox size comes from the template.

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Cold starts

When no sandbox has run for a while, the sandbox servers are stopped to save cost. The next create waits while one starts (up to 60 s); if that takes longer, the API answers 503 with Retry-After: 30 and the SDK retries. Paused sandboxes do not need a running server until you resume them.
How long a cold start takes on the production fleet has not been measured yet, so the preview has no published create or resume latency. On the engine’s test hosts a resume took 0.8 to 0.9 s.