Software1 hOctober 10, 2026, 02:00

Codex on Windows adds MXC sandbox without admin setup

OpenAI added an MXC-based sandbox mode to Codex on Windows, built on Microsoft Execution Containers. It needs no admin-approved setup, separate Windows accounts or local firewall rules, but requires Windows 11 24H2 build 26100.9278+ or 25H2 build 26200.9278+ and Codex CLI 0.162.0+.

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Codex on Windows adds MXC sandbox without admin setup

MXC requires Windows 11 24H2 build 26100.9278+ or 25H2 build 26200.9278+
Codex CLI 0.162.0+ can test MXC without changing the saved sandbox choice
MXC policy splits files into writable, read-only and inaccessible locations
Known bug: MXC fails to start when a BitLocker drive is locked

#OpenAI#Codex#Microsoft#Windows

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