---
type: "Evidence Item"
title: "Building a safe, effective sandbox to enable Codex on Windows"
description: "Learn how OpenAI built a secure sandbox for Codex on Windows, enabling safe, efficient coding agents with controlled file access and network restrictions."
resource: "https://openai.com/index/building-codex-windows-sandbox"
tags: ["appendix-iii", "vendor", "openai"]
timestamp: "2026-05-13"
category: "vendor"
publisher: "OpenAI"
cope_score: 74
confidence: 0.9
---

# Building a safe, effective sandbox to enable Codex on Windows

# Claim

Learn how OpenAI built a secure sandbox for Codex on Windows, enabling safe, efficient coding agents with controlled file access and network restrictions.

# Relevance

Appendix III, section two: vendor threshold and platform capability evidence

# Oracle Verdict

This is a lower-to-mid strength vendor signal for the capability register. It does not prove displacement on its own, but it records another platform step that can later show up as workflow automation, procurement change, or organisational dependency.

# Metadata

* Publisher: OpenAI
* Category: vendor
* Sector: Software engineering
* Capability: Autonomous software engineering and computer-use agents
* Cope score: 74
* Confidence: 0.9

# Related Concepts

* [Live evidence index](index.md)
* [Thesis](../thesis.md)

# Citations

[1] [Building a safe, effective sandbox to enable Codex on Windows](https://openai.com/index/building-codex-windows-sandbox)