# Harbor on Vercel Sandbox: parallel Terminal-Bench without your laptop

Harbor is the open-source eval harness behind Terminal-Bench. As of [17 September 2026](https://vercel.com/changelog/run-terminal-bench-and-other-harbor-evals-on-vercel-sandbox), `harbor run --env vercel` places each trial in its own Firecracker microVM on [Vercel Sandbox](https://vercel.com/docs/vercel-sandbox). That is the production change: you can parallelize agent benchmarks beyond your laptop without collapsing network policy and secrets into the same guest as the agent under test.

If you already measure coding agents with a fixed bench, this update changes where the trials run — not whether you still need a written acceptance gate. Pair it with a durable evaluation loop, not a one-off screenshot of pass rates.

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*This is an excerpt. Read the full post at [otf-kit.dev/blog/harbor-evals-vercel-sandbox](https://otf-kit.dev/blog/harbor-evals-vercel-sandbox) — full-stack kits your AI coding agent can actually ship to production. [Browse the kits →](https://otf-kit.dev)*