Development environments / GitHub Copilot cloud sandboxes alternative

GitHub Copilot cloud sandboxes alternative

GitHub Copilot cloud sandboxes move interactive Copilot work into isolated hosted Linux environments. Stopped sessions save files, environment variables and in-progress work for restoration. This is an integrated agent experience, with a different access and lifecycle contract from a general-purpose sandbox API.

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Reviewed 2026-10-19 · Published by the Sandbox0 team

When GitHub Copilot cloud sandboxes fits

Choose Copilot cloud sandboxes for an integrated interactive Copilot CLI/app experience, cross-device continuation and GitHub identity/governance. Keep that harness and session interface if it is the user experience you need.

When to consider Sandbox0

Consider Sandbox0 when you need an independent runtime API for your chosen agents, whole-RootFS online growth and supported paused-file operations. Agent UI, model credentials, collaboration and GitHub policy integration remain separate responsibilities.

Capabilities

GitHub Copilot cloud sandboxes and Sandbox0: what persists?

Feature comparison with documentation and verification status
Environment and runtime lifetimeGitHub Copilot cloud sandboxesNot established in this reviewSandbox0ttl and hard_ttl default to 0 (disabled). Configure idle pause and deletion policies for the same persistent sandbox identity; an idle running sandbox still accrues compute charges.Read documentation →
Persistent filesGitHub Copilot cloud sandboxesStopped session snapshots restore files and environment state.View evidence ↗Sandbox0The writable RootFS survives successful checkpoints, including software, system configuration, dependencies, and user data.Read documentation →
Whole RootFSGitHub Copilot cloud sandboxesThe Copilot-facing contract does not enumerate complete writable system-path coverage.View evidence ↗Sandbox0Persistence extends beyond /workspace to paths such as /usr/local, /etc, and /home. Runtime tmpfs and virtual filesystems are excluded.Read documentation →
Release compute, keep stateGitHub Copilot cloud sandboxesStopped sessions retain saved state for explicit resumption.View evidence ↗Sandbox0Pause compute between tasks; resume on available capacity. Default resume starts fresh processes from the saved filesystem.Read documentation →
Memory and process stateGitHub Copilot cloud sandboxesBacking-platform full-memory support is not a uniform Copilot-facing arbitrary RAM guarantee.View evidence ↗Sandbox0Experimental memory checkpoints can preserve compatible process state. Use memory: true on both pause and resume on a compatible deployment. A filesystem checkpoint alone does not preserve running processes.Read documentation →

Online RootFS growth

On growth-enabled images, Sandbox0 automatically expands the writable RootFS as free space runs low, within a configured sparse logical ceiling up to 64 TiB. Agent processes keep running. Growth is enabled in the qualified Cloud region; confirm activation for other regions. Existing images and snapshots retain their captured storage geometry. The ceiling is logical capacity, not preallocated host disk.

Copilot cloud sandboxes already preserve stopped session state. The reviewed Copilot interface does not establish automatic online RootFS growth or a configurable growing-disk contract exposed to arbitrary runtime clients.

Files while compute is paused

Sandbox0's Files API reads persistent files without resuming compute. Filesystem-only pauses also permit edits; retained-memory pauses are read-only and reject mutations with 409. SSH, SFTP, file watching, and runtime-only mounts require running compute.

Copilot restores stopped sessions for continued work. Snapshot storage billing does not establish a full-RootFS file API that can read and mutate files while guest compute remains stopped.

See paused file operations →

The cloud session and its snapshot have separate states

Stopping saves state for later restoration; deleting removes both the session and its snapshot. The service is built on Azure Container Apps Sandboxes, but that backing platform’s capabilities should not automatically be assumed to exist in every Copilot-facing interface.

Source 1 ↗

Cloud access is an experimental interactive surface

Current docs require experimental cloud sandbox access and restrict the CLI to interactive sessions: cloud mode cannot be combined with programmatic -p or -i use. Organizations must enable the cloud access policy. This is not a drop-in API for arbitrary headless harnesses.

Source 1 ↗

Stopped compute is free while snapshot storage continues

Running sessions accrue a compute-second meter plus allocated memory, rather than memory actually used. Stopped sessions accrue snapshot storage until deletion. The documented $10 preview entitlement expired at the end of July 2026; it should not be presented as a current ongoing allowance.

Source 1 ↗

Pricing

Compare billing models, then price your workload

CPU allocation, memory, billing minimums, disk, plan fees, and supported workload differ. These meters are not equal-performance machine quotes. Confirm region, resource units, and included allowances before estimating a total.

GitHub Copilot cloud sandboxes

Pricing reviewed 2026-10-19

Running session compute
$0.000024 per compute-second
A session-time meter, not labeled per vCPU.
Rate source ↗
Allocated running memory
$0.000003 per GiB-second
Allocated memory, not active working-set consumption.
Rate source ↗
Stopped snapshot storage
$0.005 per GiB-month
Metered from stop until snapshot/session deletion.
Rate source ↗
Local sandboxing
Included in the standard Copilot seat
This is a local mode; cloud compute and model/seat terms are distinct.
Rate source ↗

Cloud sandboxing is public preview/experimental and subject to change. The account or repository owner pays under the documented ownership rules. The historical preview credit ended in July 2026; confirm effective budgets, seat and model usage independently.

Check current GitHub Copilot cloud sandboxes pricing ↗

Sandbox0

$0.015/GiB-hour compute (billed by the second at approximately $0.000004167/GiB-second), plus $0.02/GiB-month of retained incremental RootFS and memory checkpoint data. Shared base images and platform recovery retention are excluded; paused sandboxes accrue storage charges only.

Compute / GiB-hour
$0.015
Retained data / GiB-month
$0.02
Paused compute
$0.00

A 4 GiB agent, 100 running hours

$6.00 compute

4 GiB × 100 hours, billed by the second. Keeping 20 GiB of billable incremental data for a full billing month adds $0.40. CPU is derived from memory by the platform; choose a tier that fits your workload.

Understand storage billing →

Before migrating from GitHub Copilot cloud sandboxes

  1. Record session owner, repository, organization policy, experimental access, saved state and snapshot retention costs.
  2. Export essential files and configure your chosen harness on Sandbox0 with explicit model credentials and collaboration requirements.
  3. Test system paths, online growth, process expectations, paused files and combined runtime, snapshots, model and seat charges.

Common questions

Is Sandbox0 a drop-in GitHub Copilot cloud sandboxes replacement?

Evaluate API compatibility and product scope. These products serve different core workflows, so a change may require a different architecture.

Does keeping files also keep a running agent?

Filesystem state and volatile process state are separate. Sandbox0 requires explicit compatible memory checkpoints to preserve running processes; its default filesystem resume starts fresh processes.

Sources and review scope

The Boat team's Battleships directory is the discovery source. References below describe the product and plan discussed on this page. Check current availability, regional terms and billing units before migrating. Where the cited material does not establish a capability or price, the comparison identifies that uncertainty.

Battleships research record ↗docs.github.com/en/copilot/concepts/security-governance-and-network-settings/about-cloud-and-local-sandboxes ↗docs.github.com/en/billing/concepts/product-billing/cloud-and-local-sandboxes ↗Sandbox0 RootFS capacity →

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