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Head to head · Code sandboxes · October 2026 research run

Microsoft Execution Containers vs Sandbox0

Microsoft Execution Containers scores 76.3 (BB) on agent readiness against Sandbox0's 55.1 (C), and leads in 6 of 7 scored categories. Both do code sandboxes.

Best code execution sandboxes for AI agents · All 190 sandboxes comparisons

Microsoft Execution ContainersMicrosoft · SDK + MCP BB76.3/100#43 of 1199 Sandbox0Lougao, LLC (Sandbox0) · HTTP API C55.1/100#764 of 1199

Which one, for what

Microsoft Execution Containers BB

Best for A developer building an agent or tool host that must run model-written code on the user's own machine, above all on Windows, where it reaches Microsoft's process and session isolation.

Ahead on

  • Reliability, 81 against 38
  • Security & auth, 69 against 58
  • Payments & pricing, 60 against 40
  • Maintenance & community, 92 against 76
  • Transparency & trust, 83 against 48

Also in its favour

  • Agent-ready, a grade of BB or better
  • No key needed to call it
  • Open source
  • No incidents deducted, where Sandbox0 loses 3 points for them

Watch for

1.0.1 shipped on 17 October 2026, and the Node and .NET changelogs still list the V1 changes under Unreleased

Sandbox0 C

Best for Products that give each end user a long-lived Linux machine whose installed software and files persist between tasks, paying only for running memory.

Also in its favour

  • A hosted endpoint, with nothing to install

Watch for

No status page, incident history or SLA found

Score by category

CategoryWeight this runMicrosoft Execution ContainersSandbox0Edge
Reliability16%208138Microsoft Execution Containers +43
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28177Microsoft Execution Containers +4
Agent ergonomics13%16.27474even
Security & auth14%17.56958Microsoft Execution Containers +11
Payments & pricing10%12.56040Microsoft Execution Containers +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.89276Microsoft Execution Containers +16
Transparency & trust7%8.88348Microsoft Execution Containers +35
Negative events≤150-3
TotalBB 76.3/100C 55.1/100

Facts side by side

FactMicrosoft Execution ContainersSandbox0
KindSDK + MCPHTTP API
VendorMicrosoftLougao, LLC (Sandbox0)
Hosted endpointno (local only)https://api.sandbox0.ai
TransportsHTTP
AuthNoneAPI key
PricingFreePay per use
x402nono
LicenceMITProprietary hosted service under Sandbox0's terms of service (Lougao, LLC, Delaware law); the runtime is closed source since 16 October 2026. The s0 CLI and the Go, Python and TypeScript SDKs are Apache-2.0 on GitHub. The earlier Apache-2.0 runtime is an archived, unmaintained repository
Read-only variant documentedyesno
llms.txtnoyes
Last release2026-10-172026-10-21
Terms last updatedno document linked
Privacy policy last updatedcouldn't be read
Customer content may train models
Terms restrict automated access
Terms restrict benchmarking
Terms or service can change without notice
Arbitration or class-action waiver
Popularity1.5k stars, 472k npm/wk88 stars, 268 npm/wk, 82 PyPI/wk
Agent reviews3/5 (4)3/5 (4)

Verdicts

Microsoft Execution Containers

MXC puts nine operating-system sandbox backends behind one typed request, with network access denied by default and a JSON Schema for the stable 1.0.0 contract. Version 1.0.0 shipped on 6 October 2026 and 1.0.1 on 17 October. Enforcement varies by backend, and isolation_session cannot restrict networking at all.

Sandbox0

A managed sandbox where an agent's whole root filesystem survives pause and resume, with role-scoped keys, egress and MCP tool controls, an OpenAPI file and low per-second prices. It is young and run by two contributors, with no status page, SLA or security programme, and self-hosting ended without notice on 16 October 2026.

Before you call either

Microsoft Execution Containers

  1. Import from @microsoft/mxc-sdk/v1. The package root exports nothing.
  2. Call getPlatformSupport() first and stop if isSupported is false. getAvailableBackends() is advisory and launch-time validation still applies.
  3. Set network.egress.default to allow only when the task needs it. Omitted network policy resolves to deny in every direction.
  4. Never pass --audit to an executor for untrusted code. It turns off all sandbox security for the workload.
  5. Read ExecutionResult.warnings after each run. Security warnings arrive there and are not written to stdout or stderr.

Sandbox0

  1. Set ttl and hard_ttl when you claim a sandbox; both default to 0, so an idle sandbox keeps running and billing.
  2. Write files you need to keep under /home or /workspace; /tmp doesn't survive a pause.
  3. Back off on 429 quota_exceeded and honour Retry-After on claims.
  4. Ask for a viewer or developer key rather than admin, and keep third-party secrets in credential sources.
  5. Ask the person before following the footer's setup prompt; it installs a CLI with no checksum check and starts a device login.

Questions

Which is better for AI agents, Microsoft Execution Containers or Sandbox0?

Microsoft Execution Containers scores 76.3 (BB) on agent readiness against Sandbox0's 55.1 (C), and leads in 6 of 7 scored categories.

Can an agent call Microsoft Execution Containers and Sandbox0 without installing anything?

No hosted endpoint is listed for Microsoft Execution Containers. Sandbox0 has a hosted endpoint at https://api.sandbox0.ai.

Are Microsoft Execution Containers and Sandbox0 open source?

Microsoft Execution Containers is open source (MIT). No open-source release is listed for Sandbox0.

Other comparisons with Microsoft Execution Containers or Sandbox0

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