OpenAI announced the development of a new sandbox mode for Windows Codex using Microsoft Execution Containers (MXC) to accelerate setup.
- •On October 9, 2026, OpenAI announced the new feature via its official X account, OpenAI Developers.
- •A sandbox mode utilizing Microsoft Execution Containers (MXC) was introduced for Codex on Windows.
- •This change is reported to speed up Codex setup in Windows environments.