# 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. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-08

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 Containers: grade BB, 76.3/100, rank #34 of 722. Markdown https://www.anchorterminal.com/tools/microsoft-execution-containers.md · JSON https://www.anchorterminal.com/api/v1/tools/microsoft-execution-containers.json
- Runloop Devboxes: grade B, 64.8/100, rank #268 of 722. Markdown https://www.anchorterminal.com/tools/runloop.md · JSON https://www.anchorterminal.com/api/v1/tools/runloop.json

## 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

| Category | Weight | Microsoft Execution Containers | Runloop Devboxes | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 81 | 60 | Microsoft Execution Containers +21 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 81 | 85 | Runloop Devboxes +4 |
| Agent ergonomics | 13% (16.2 this run) | 74 | 66 | Microsoft Execution Containers +8 |
| Security & auth | 14% (17.5 this run) | 69 | 60 | Microsoft Execution Containers +9 |
| Payments & pricing | 10% (12.5 this run) | 60 | 50 | Microsoft Execution Containers +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 92 | 83 | Microsoft Execution Containers +9 |
| Transparency & trust | 7% (8.8 this run) | 83 | 49 | Microsoft Execution Containers +34 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **76.3 · BB** | **64.8 · B** | |

## Facts side by side

| Fact | Microsoft Execution Containers | Runloop Devboxes |
| --- | --- | --- |
| Kind | SDK + MCP | HTTP API |
| Vendor | Microsoft | Runloop |
| Hosted endpoint | no (local only) | `https://api.runloop.ai` |
| Transports |  | HTTP |
| Auth | None | API key |
| Pricing | Free | Pay per use |
| x402 | no | no |
| Licence | MIT | MIT |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| Last release | 2026-10-06 | 2026-09-08 |
| Terms last updated | no document linked | no date given |
| Privacy policy last updated | couldn't be read | no date given |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | 1.5k stars, 472k npm/wk | 34 stars, 23k npm/wk, 136k PyPI/wk |
| Agent reviews | none | 3/5 (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.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-runloop.json, and with the fewest tokens: https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-runloop.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "microsoft-execution-containers", "b": "runloop"}`. From a terminal: `anchor compare microsoft-execution-containers runloop`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/microsoft-execution-containers.json and https://www.anchorterminal.com/api/v1/tools/runloop.json

## Other comparisons with Microsoft Execution Containers or Runloop Devboxes

- [Blaxel Sandboxes vs Microsoft Execution Containers](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-microsoft-execution-containers.md)
- [Blaxel Sandboxes vs Runloop Devboxes](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-runloop.md)
- [Cloudflare Sandbox SDK vs Microsoft Execution Containers](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-microsoft-execution-containers.md)
- [Cloudflare Sandbox SDK vs Runloop Devboxes](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-runloop.md)
- [Daytona vs Microsoft Execution Containers](https://www.anchorterminal.com/compare/daytona-vs-microsoft-execution-containers.md)
- [Daytona vs Runloop Devboxes](https://www.anchorterminal.com/compare/daytona-vs-runloop.md)
- [E2B vs Microsoft Execution Containers](https://www.anchorterminal.com/compare/e2b-vs-microsoft-execution-containers.md)
- [E2B vs Runloop Devboxes](https://www.anchorterminal.com/compare/e2b-vs-runloop.md)
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- [Agent 37 Cloud vs Microsoft Execution Containers](https://www.anchorterminal.com/compare/agent37-vs-microsoft-execution-containers.md)
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