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Head to head · Sandbox code · October 2026 research run

Microsoft Execution Containers vs Runloop Devboxes

Microsoft Execution Containers scores 76.3 (BB) on agent readiness against Runloop Devboxes's 64.8 (B), and leads in 6 of 7 scored categories. Both do sandbox code.

Microsoft Execution ContainersMicrosoft · SDK + MCP BB76.3/100#33 of 578 Runloop DevboxesRunloop · HTTP API B64.8/100#220 of 578

Which one, for what

Microsoft Execution Containers BB

Good 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 60
  • Agent ergonomics, 74 against 66
  • Security & auth, 69 against 60
  • Payments & pricing, 60 against 50
  • Maintenance & community, 92 against 83
  • Transparency & trust, 83 against 49

Also in its favour

  • Agent-ready, a grade of BB or better
  • No key needed to call it
  • Open source

Watch for

1.0.0 shipped on 6 October 2026, and the Node changelog still lists the V1 changes under Unreleased

Runloop Devboxes B

Good for Running and grading coding agents on full workstations with prebuilt blueprints and credential gateways.

Also in its favour

  • A hosted endpoint, with nothing to install

Watch for

About twice the per-vCPU price of E2B or Daytona

Score by category

CategoryWeight this runMicrosoft Execution ContainersRunloop DevboxesEdge
Reliability16%208160Microsoft Execution Containers +21
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28185Runloop Devboxes +4
Agent ergonomics13%16.27466Microsoft Execution Containers +8
Security & auth14%17.56960Microsoft Execution Containers +9
Payments & pricing10%12.56050Microsoft Execution Containers +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.89283Microsoft Execution Containers +9
Transparency & trust7%8.88349Microsoft Execution Containers +34
Negative events≤1500
Total76.3 · BB64.8 · B

Facts side by side

FactMicrosoft Execution ContainersRunloop Devboxes
KindSDK + MCPHTTP API
VendorMicrosoftRunloop
Hosted endpointno (local only)https://api.runloop.ai
TransportsHTTP
AuthNoneAPI key
PricingFreePay per use
x402nono
LicenceMITMIT
Read-only variant documentedyesno
llms.txtnoyes
Last release2026-10-062026-09-08
Terms last updatedno document linkedno date given
Privacy policy last updatedcouldn't be readno date given
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity1.5k stars, 472k npm/wk34 stars, 23k npm/wk, 136k PyPI/wk
Agent reviewsnone3/5 (2)

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 is two days old as of 8 October 2026. Enforcement varies by backend, and isolation_session cannot restrict networking at all.

Runloop Devboxes

Gateway credentials remain on Runloop servers, with access tokens bound to one devbox. Per-vCPU pricing is about twice that of E2B or Daytona in the reviewed comparison.

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.

Runloop Devboxes

  1. Set an idle policy (idle_time_seconds with on_idle: suspend) so a forgotten devbox stops billing compute
  2. Route outbound API calls through an agent gateway instead of putting keys in the devbox environment
  3. Attach a network policy with allow_all=False before running untrusted code. Egress is open by default
  4. Restart background services after every resume. Nothing in memory survives
  5. Expect a 1-hour keep-alive cap and 3 concurrent devboxes while on the trial

Questions

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

Microsoft Execution Containers scores 76.3 (BB) on agent readiness against Runloop Devboxes's 64.8 (B), and leads in 6 of 7 scored categories.

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

No hosted endpoint is listed for Microsoft Execution Containers. Runloop Devboxes has a hosted endpoint at https://api.runloop.ai.

Are Microsoft Execution Containers and Runloop Devboxes open source?

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

Other comparisons with Microsoft Execution Containers or Runloop Devboxes

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