Sandboxer vs GitHub Copilot cloud agent

GitHub Copilot cloud agent researches a repository, makes changes and pushes branches from an ephemeral cloud development environment you configure with copilot-setup-steps. It is an agent feature, not a machine you log into. Pick it for GitHub-centred pull-request work; pick Sandboxer for full VMs where you choose the agent.

Checked against GitHub Copilot cloud agent's public docs on October 24, 2026. Sources are linked in the table and listed below.

At a glance

Sandboxer and GitHub Copilot cloud agent compared
Capability	Sandboxer	GitHub Copilot cloud agent
Isolation	microVM Cloud Hypervisor, its own kernel	Ephemeral GitHub Actions runner environment Standard GitHub-hosted runner by default; larger or self-hosted runners optional.
Full Linux with root	Ubuntu 24.04, sudo, systemd
Docker inside	Preinstalled
Nested virtualization (/dev/kvm)
Pause and resume with memory	Running processes come back	The environment is described as ephemeral; no pause/resume is documented.
Fork a sandbox	Copy-on-write disk copy that boots fresh	Not applicable: a new environment is created for a task.
HTTPS URL per port	Private with a token, or public	Not an exposed-environment product; work is delivered as commits and pull requests.
Longest session	No limit on paid plans Auto-stop is up to 30 days or off	59 minutes per agent session Documented maximum execution time per cloud agent session; cannot be extended. A shorter limit can be set with timeout-minutes.
Billing	Per second, flat rate per size Stopped sandboxes are free
GPUs
Self-host or open source		partial Self-hosted Ubuntu x64 or Windows runners (for example with ARC) can run the environment.
Regions	US East (Virginia) and EU Central (Finland)

= not documented publicly.

Where GitHub Copilot cloud agent is strong

Deep GitHub integration: branch creation, commits, pull requests from a task.
Environment customisable through a copilot-setup-steps workflow with services, permissions and runner choice.
Choice of standard, larger or self-hosted runners, including Azure private networking.
Org owners can set the default runner type and control repository overrides.

Where Sandboxer differs

Copilot cloud agent is one agent working in a GitHub-managed environment; Sandboxer sandboxes host any of several agents.
The cloud agent is not documented as offering SSH or a persistent machine; Sandboxer sandboxes stop and resume with processes.
The environment is built on Actions runners; Sandboxer sandboxes are separate microVMs with their own kernel.
Each Copilot cloud agent session has a documented 59-minute maximum; Sandboxer paid plans can run with no time limit.

Pick GitHub Copilot cloud agent if

Your work lives in GitHub repositories and you want agent-made pull requests.
You want Actions-based setup and org-wide policy controls.
You want to use self-hosted runners for the agent.

Pick Sandboxer if

You want a full Ubuntu 24.04 VM with its own kernel, root/sudo, systemd and Docker preinstalled, and nested KVM (/dev/kvm).
You want to stop a sandbox and resume it with running processes back, with stopped sandboxes costing nothing.
You want coding agents (Claude Code, Codex, OpenCode and others) preinstalled, driven through a prompt API with streamed events, plus any port exposed as an HTTPS URL.

Sources

Products change. If something here is out of date, email hello@sandboxer.com and we'll fix it. GitHub Copilot cloud agent is a trademark of its owner. Sandboxer is an independent product and is not affiliated with GitHub Copilot cloud agent.

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