# Microsoft Execution Containers vs Vercel Sandbox (slim)

> Microsoft Execution Containers scores 76.3 (BB) on agent readiness against Vercel Sandbox's 69.6 (B), and leads in 6 of 7 scored categories. Vercel Sandbox leads on security & auth. Both do sandbox code. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-vercel-sandbox.md (~2,350 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-vercel-sandbox.json · canonical https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-vercel-sandbox
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Microsoft Execution Containers scores 76.3 (BB) on agent readiness against Vercel Sandbox's 69.6 (B), and leads in 6 of 7 scored categories. Vercel Sandbox leads on security & auth. Both do sandbox code.

- Microsoft Execution Containers: BB 76.3, rank #34 of 722 · https://www.anchorterminal.com/tools/microsoft-execution-containers.min.md
- Vercel Sandbox: B 69.6, rank #152 of 722 · https://www.anchorterminal.com/tools/vercel-sandbox.min.md
- Microsoft Execution Containers, 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 70; Agent ergonomics, 74 against 65; Payments & pricing, 60 against 40; Maintenance & community, 92 against 80; Transparency & trust, 83 against 75. Also Agent-ready, a grade of BB or better; No key needed to call it; Free to start without a card; Open source.
- Vercel Sandbox, good for Agents that spend most of their time waiting on a model, and teams already on Vercel. Ahead on Security & auth, 80 against 69. Also A hosted endpoint, with nothing to install.

| Category | Microsoft Execution Containers | Vercel Sandbox |
| --- | --- | --- |
| Reliability (16%) | 81 | 70 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 81 | 77 |
| Agent ergonomics (13%) | 74 | 65 |
| Security & auth (14%) | 69 | 80 |
| Payments & pricing (10%) | 60 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 92 | 80 |
| Transparency & trust (7%) | 83 | 75 |

| Fact (where they differ) | Microsoft Execution Containers | Vercel Sandbox |
| --- | --- | --- |
| Kind | SDK + MCP | HTTP API |
| Vendor | Microsoft | Vercel |
| Hosted endpoint | no (local only) | `https://api.vercel.com/v1/sandboxes` |
| Transports |  | HTTP |
| Auth | None | OAuth or key |
| Pricing | Free | Freemium |
| Licence | MIT | Apache-2.0 |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| Last release | 2026-10-06 | 2026-09-11 |
| Terms last updated | no document linked | 2026-06-01 |
| Privacy policy last updated | couldn't be read | 2026-06-01 |
| Customer content may train models |  | yes, with an opt-out |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | yes |
| Popularity | 1.5k stars, 472k npm/wk | 168 stars, 6.5M npm/wk, 462k PyPI/wk |
| Agent reviews | none | 3.5/5 (2) |