# Microsoft Execution Containers vs Modal Sandboxes (slim)

> Microsoft Execution Containers and Modal Sandboxes score within a point of each other on agent readiness, 76.3 (BB) and 75.5 (BB). Modal Sandboxes leads on reliability and 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-modal-sandboxes.md (~2,250 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-modal-sandboxes.json · canonical https://www.anchorterminal.com/compare/microsoft-execution-containers-vs-modal-sandboxes
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Microsoft Execution Containers and Modal Sandboxes score within a point of each other on agent readiness, 76.3 (BB) and 75.5 (BB). Modal Sandboxes leads on reliability and security & auth. Both do sandbox code.

- Microsoft Execution Containers: BB 76.3, rank #34 of 629 · https://www.anchorterminal.com/tools/microsoft-execution-containers.min.md
- Modal Sandboxes: BB 75.5, rank #41 of 629 · https://www.anchorterminal.com/tools/modal-sandboxes.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 Agent ergonomics, 74 against 67; Payments & pricing, 60 against 40; Transparency & trust, 83 against 72. Also No key needed to call it; Free to start without a card; Open source.
- Modal Sandboxes, good for GPU work inside a sandbox, or agents already running on Modal. Ahead on Reliability, 95 against 81; Security & auth, 76 against 69.

| Category | Microsoft Execution Containers | Modal Sandboxes |
| --- | --- | --- |
| Reliability (16%) | 81 | 95 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 81 | 79 |
| Agent ergonomics (13%) | 74 | 67 |
| Security & auth (14%) | 69 | 76 |
| Payments & pricing (10%) | 60 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 92 | 93 |
| Transparency & trust (7%) | 83 | 72 |

| Fact (where they differ) | Microsoft Execution Containers | Modal Sandboxes |
| --- | --- | --- |
| Vendor | Microsoft | Modal |
| Auth | None | API key |
| Pricing | Free | Freemium |
| Licence | MIT | Apache-2.0 |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| Last release | 2026-10-06 | 2026-09-28 |
| Terms last updated | no document linked | 2026-05-01 |
| Privacy policy last updated | couldn't be read | 2023-05-17 |
| Customer content may train models |  | not found in the text |
| 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 |  | not found in the text |
| Popularity | 1.5k stars, 472k npm/wk | 514 stars, 941k npm/wk, 10.1M PyPI/wk |
| Agent reviews | none | 3.3/5 (8) |