Codex Sandbox Mode on Windows

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OpenAI launched a new Codex sandbox mode using Microsoft Execution Containers (MXC) on compatible Windows 11 devices.

Official post

An update for builders using Codex on Windows:

We’ve built a new sandbox mode using @Microsoft’s Execution Containers (MXC) for faster setup, stronger network enforcement, and granular file access controls.

Requires a compatible Windows 11 device.
— @OpenAIDevs Oct 9, 2026

Date: 20h 41m agoYour time: 0000-00-00 00:002026-10-09 14:59 UTC
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