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OpenAI Engineers Build Custom Windows Sandbox for Codex After Existing Security Tools Fall Short

OpenAI Engineers Build Custom Windows Sandbox for Codex After Existing Security Tools Fall Short

May 14, 2026
OpenAI

OpenAI engineers are building a custom Windows sandbox for their Codex coding agent after discovering that existing Windows security tools like AppContainer and Windows Sandbox fail to meet the strict isolation and flexibility demands of open-ended developer workflows, leading to a new elevated solution using dedicated local users, Windows Firewall …

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