{"id":7039265,"date":"2026-08-16T12:26:37","date_gmt":"2026-08-16T12:26:37","guid":{"rendered":"https:\/\/peraltafinancing.com\/analytics\/how-to-install-codex-cli-a-step-by-step-setup-guide\/"},"modified":"2026-08-16T12:26:37","modified_gmt":"2026-08-16T12:26:37","slug":"how-to-install-codex-cli-a-step-by-step-setup-guide","status":"publish","type":"post","link":"https:\/\/fivemor.com\/?p=7039265","title":{"rendered":"How to Install Codex CLI: A Step-by-Step Setup Guide"},"content":{"rendered":"<p> <br \/>\n<\/p>\n<div id=\"article-start\">\n<p>If you have already used\u00a0Codex in ChatGPT, the Codex CLI will feel familiar. It brings the same AI assistance directly into your local development environment, where it can work with your repository, shell, tests, and other tools.<\/p>\n<p>Installation takes only <mark style=\"background-color:#7bdcb5\" class=\"has-inline-color\">one command<\/mark>, but the setup choices that follow are worth<strong> reviewing carefully<\/strong>.\u00a0In this article, you\u2019ll learn how to install Codex CLI on Windows, macOS, and Linux and complete a clean first-time setup.<\/p>\n<h2 class=\"wp-block-heading\" id=\"h-before-you-install\">Before You Install<\/h2>\n<p>Use the standalone installer if you do not already manage developer tools through Homebrew or npm.<\/p>\n<ul class=\"wp-block-list\">\n<li><strong>Windows:<\/strong> <code>PowerShell<\/code> on a supported Windows system. WSL2 is optional.<\/li>\n<li><strong>macOS or Linux:<\/strong> A terminal with <code>curl<\/code> available.<\/li>\n<li><strong>Account:<\/strong> A ChatGPT account or an OpenAI Platform API key.<\/li>\n<li><strong>Workspace:<\/strong> A project folder you own and trust.<\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\" id=\"h-installation\">Installation<\/h2>\n<h3 class=\"wp-block-heading\" id=\"h-1-run-the-installer\">1. Run the installer<\/h3>\n<p>Open a terminal. Next, run the command for your operating system.<\/p>\n<h4 class=\"wp-block-heading\" id=\"h-macos-and-linux\">macOS and Linux<\/h4>\n<pre class=\"wp-block-code\"><code>curl -fsSL https:\/\/chatgpt.com\/codex\/install.sh | sh<\/code><\/pre>\n<h4 class=\"wp-block-heading\" id=\"h-windows-powershell\">Windows PowerShell<\/h4>\n<pre class=\"wp-block-code\"><code>powershell -ExecutionPolicy ByPass -c \"irm https:\/\/chatgpt.com\/codex\/install.ps1 | iex\"<\/code><\/pre>\n<p>You can also run this via CMD. It executes the PowerShell command.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.analyticsvidhya.com\/wp-content\/uploads\/2026\/08\/image-1-1ym8wz.webp\" alt=\"Windows PowerShell showing Codex CLI installed successfully and added to PATH.\"\/><\/figure>\n<\/div>\n<p>The Windows installer adds Codex to your PATH; consequently, it is ready for use. It also offers to launch the application.<\/p>\n<p><strong>Note: <\/strong>If the installer asks to start Codex immediately, press N. Do this unless the terminal is already inside a project folder.<\/p>\n<h4 class=\"wp-block-heading\" id=\"h-alternative-install-methods\">Alternative install methods<\/h4>\n<p>Do you prefer a package manager? Use one of these options instead:<\/p>\n<pre class=\"wp-block-code\"><code># Homebrew\nbrew install --cask codex\n\n# npm\nnpm install -g @openai\/codex<\/code><\/pre>\n<p>Similarly, Homebrew is suitable for a Brew-managed Mac setup. Use <code>npm<\/code> if Node.js already manages your global developer tools.<\/p>\n<h2 class=\"wp-block-heading\" id=\"h-first-run\">First Run<\/h2>\n<h3 class=\"wp-block-heading\" id=\"h-2-open-a-project-folder\">2. Open a project folder<\/h3>\n<p>Move into the repository where you want Codex to work. Then, launch it.<\/p>\n<pre class=\"wp-block-code\"><code># Windows PowerShell\ncd C:\\Users\\you\\code\\my-project\ncodex\n\n# macOS or Linux\ncd ~\/code\/my-project\ncodex<\/code><\/pre>\n<p>Codex treats the current directory as its starting workspace. By default the <code>System32<\/code> directory would be the default one. <\/p>\n<h3 class=\"wp-block-heading\" id=\"h-3-choose-how-to-sign-in\">3. Choose how to sign in<\/h3>\n<p>The first launch offers three sign-in routes:<\/p>\n<ul class=\"wp-block-list\">\n<li><strong>Sign in with ChatGPT:<\/strong> Uses the Codex allowance from your ChatGPT plan.<\/li>\n<li><strong>Sign in with Device Code:<\/strong> Best for SSH, containers, or machines without a browser callback.<\/li>\n<li><strong>Provide your own API key:<\/strong> Usage is billed through the OpenAI Platform account linked to that key.<\/li>\n<\/ul>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.analyticsvidhya.com\/wp-content\/uploads\/2026\/08\/image-2-1ym8wz.webp\" alt=\"Codex CLI first-run menu with ChatGPT, device code, and API key authentication options.\"\/><\/figure>\n<\/div>\n<p>OpenAI\u2019s current <a href=\"https:\/\/developers.openai.com\/codex\/pricing\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Codex pricing page<\/a> lists Free, Go, Plus, Pro, Business, Edu, and Enterprise plans. API-key usage is billed separately. On the other hand, usage in a subscription is shared between the web app and Codex.<\/p>\n<h3 class=\"wp-block-heading\" id=\"h-4-authorize-codex-in-the-browser\">4. Authorize Codex in the browser<\/h3>\n<p>If you choose ChatGPT, Codex prints an authentication URL. It also opens this URL in your browser. If the browser does not open, copy and paste the URL yourself.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.analyticsvidhya.com\/wp-content\/uploads\/2026\/08\/image-3-1ym8wz.webp\" alt=\"PowerShell showing the Codex browser authentication handoff with the sensitive OAuth URL strongly blurred.\"\/><figcaption class=\"wp-element-caption\">Codex prints the browser sign-in URL in the terminal.<\/figcaption><\/figure>\n<\/div>\n<p>Next, sign in to the browser using the ChatGPT account you want Codex to use.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.analyticsvidhya.com\/wp-content\/uploads\/2026\/08\/image-4-1ym8wz.webp\" alt=\"ChatGPT sign-in screen opened by the Codex CLI browser authentication flow.\"\/><\/figure>\n<\/div>\n<p>Check the account on the confirmation screen before you continue.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.analyticsvidhya.com\/wp-content\/uploads\/2026\/08\/image-5-1ym8wz.webp\" alt=\"ChatGPT account confirmation screen with the user's email address strongly blurred.\"\/><\/figure>\n<\/div>\n<p>As a result, when the browser shows the success page, close the tab. Then, return to the terminal.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.analyticsvidhya.com\/wp-content\/uploads\/2026\/08\/image-6-1ym8wz.webp\" alt=\"Browser page confirming that the user has signed in to Codex.\"\/><\/figure>\n<\/div>\n<h3 class=\"wp-block-heading\" id=\"h-5-review-the-first-run-notice\">5. Review the first-run notice<\/h3>\n<p>Back in the terminal, Codex confirms your account. It also reminds you that autonomy is a choice. Do not ignore this notice. Press Enter after you read it.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.analyticsvidhya.com\/wp-content\/uploads\/2026\/08\/image-7-1ym8wz.webp\" alt=\"Codex command-line agent autonomy settings\"\/><figcaption class=\"wp-element-caption\">Codex confirms the ChatGPT login and asks you to review its autonomy settings<\/figcaption><\/figure>\n<\/div>\n<p>You can inspect or change the active boundary later. Use the <code>\/permissions<\/code> command to do this.<\/p>\n<h3 class=\"wp-block-heading\" id=\"h-6-trust-the-right-folder\">6. Trust the right folder<\/h3>\n<p>Codex now prints the directory it is about to trust. Read the path carefully. Do not just look at the highlighted option.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.analyticsvidhya.com\/wp-content\/uploads\/2026\/08\/image-8-1ym8wz.webp\" alt=\"Directory trust prompt for Codex\"\/><figcaption class=\"wp-element-caption\">Don\u2019t use System32 as default directory (this is a VM for demonstration)<\/figcaption><\/figure>\n<\/div>\n<p>Trust allows project-local configuration, hooks, and execution policies to load. If the path is wrong, quit the program. Move into the correct repository and run codex again.<\/p>\n<h3 class=\"wp-block-heading\" id=\"h-7-configure-the-windows-sandbox\">7. Configure the Windows sandbox<\/h3>\n<p>On native Windows, Codex may ask how to create its sandbox. Choose the default sandbox if you can approve the administrator prompt.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.analyticsvidhya.com\/wp-content\/uploads\/2026\/08\/image-9-1ym8wz.webp\" alt=\"Codex sandbox configuration options\"\/><figcaption class=\"wp-element-caption\">The default Windows sandbox is the preferred option<\/figcaption><\/figure>\n<\/div>\n<p>OpenAI\u2019s <a href=\"https:\/\/developers.openai.com\/codex\/windows\/windows-sandbox\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Windows sandbox documentation<\/a> calls the elevated mode the preferred native setup. It uses lower-privilege sandbox users. It also uses filesystem boundaries, firewall rules, and local policy changes. The non-admin mode exists for machines where elevation is unavailable. However, it offers weaker protection.<\/p>\n<h3 class=\"wp-block-heading\" id=\"h-8-send-a-safe-first-prompt\">8. Send a safe first prompt<\/h3>\n<p>Once the prompt appears, start with a read-only task. This confirms that Codex can see the repository. It does not ask the tool to modify anything.<\/p>\n<pre class=\"wp-block-code\"><code>Explain this repository's structure. Do not change any files. Then list the three commands I should run to verify it locally.<\/code><\/pre>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.analyticsvidhya.com\/wp-content\/uploads\/2026\/08\/image-10-1ym8wz.webp\" alt=\"Codex ready for user input\"\/><figcaption class=\"wp-element-caption\">The prompt appears after account, folder, and sandbox setup finish<\/figcaption><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\" id=\"h-useful-commands-after-setup\">Useful Commands After Setup<\/h2>\n<ul class=\"wp-block-list\">\n<li><strong>\/status:<\/strong> show the model, directory, account, and active settings.<\/li>\n<li><strong>\/permissions:<\/strong> inspect or change what Codex can read, edit, or run.<\/li>\n<li><strong>\/model:<\/strong> choose the model and reasoning effort available to your account.<\/li>\n<li><strong>\/init:<\/strong> create an <code>AGENTS.md<\/code> file for repository-specific instructions.<\/li>\n<li><strong>\/review:<\/strong> review changes before you commit them.<\/li>\n<li><strong>\/exit:<\/strong> leave the CLI cleanly.<\/li>\n<\/ul>\n<p>Keep the default workspace boundary unless the task needs more access. The <a href=\"https:\/\/developers.openai.com\/codex\/permissions\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">permissions documentation<\/a> explains the read-only, workspace, and full-access profiles.<\/p>\n<h2 class=\"wp-block-heading\" id=\"h-updating-codex-cli\">Updating Codex CLI<\/h2>\n<p>For a standalone installation, rerun the platform installer. OpenAI uses the same command for installation and updates.<\/p>\n<pre class=\"wp-block-code\"><code># macOS or Linux\ncurl -fsSL https:\/\/chatgpt.com\/codex\/install.sh | sh\n\n# Windows PowerShell\npowershell -ExecutionPolicy ByPass -c \"irm https:\/\/chatgpt.com\/codex\/install.ps1 | iex\"<\/code><\/pre>\n<p>Update package-manager installs through the same manager:<\/p>\n<pre class=\"wp-block-code\"><code># Homebrew\nbrew upgrade --cask codex\n\n# npm\nnpm install -g @openai\/codex@latest<\/code><\/pre>\n<p>Finish with <code>codex --version<\/code> to confirm the installed build.<\/p>\n<h2 class=\"wp-block-heading\" id=\"h-conclusion\">Conclusion<\/h2>\n<p>Installing Codex CLI comes down to three moves:<\/p>\n<ol class=\"wp-block-list\">\n<li>An install command<\/li>\n<li>Single account approval<\/li>\n<li>A workspace and sandbox decision<\/li>\n<\/ol>\n<p>The only genuinely bad setup is the convenient one in the wrong directory. Launch from the repository, keep the sandbox boundary, check <code>\/permissions<\/code>, and begin with a read-only instruction.<\/p>\n<p>Once that is clean, run <code>\/init<\/code> and let the project carry its own rules.<\/p>\n<p><strong>Read more:<\/strong> <a href=\"https:\/\/www.analyticsvidhya.com\/blog\/2026\/08\/best-skills-claude-code-codex-cli\/\" target=\"_blank\" rel=\"noreferrer noopener\">Top 10 Skills for Claude Code and Codex CLI<\/a><\/p>\n<div class=\"schema-faq wp-block-yoast-faq-block\">\n<div class=\"schema-faq-section\" id=\"faq-question-1786701848439\"><strong class=\"schema-faq-question\">Q1. Is Codex CLI free?<\/strong> <\/p>\n<p class=\"schema-faq-answer\">A. The CLI is free to install. Codex is included with ChatGPT Free, Go, Plus, Pro, Business, Edu, and Enterprise plans, with different limits. API-key usage is billed separately.<\/p>\n<\/p><\/div>\n<div class=\"schema-faq-section\" id=\"faq-question-1786701848576\"><strong class=\"schema-faq-question\">Q2. Do I need Node.js?<\/strong> <\/p>\n<p class=\"schema-faq-answer\">A. No. The standalone installer does not require Node.js. You need it only if you choose the npm installation method.<\/p>\n<\/p><\/div>\n<div class=\"schema-faq-section\" id=\"faq-question-1786701848713\"><strong class=\"schema-faq-question\">Q3. Does Codex CLI need WSL on Windows?<\/strong> <\/p>\n<p class=\"schema-faq-answer\">A. No. Codex runs natively on Windows with a Windows sandbox. WSL2 remains useful when your repository and toolchain already live in Linux.<\/p>\n<\/p><\/div>\n<div class=\"schema-faq-section\" id=\"faq-question-1786701848850\"><strong class=\"schema-faq-question\">Q4. Can I use an API key instead of ChatGPT?<\/strong> <\/p>\n<p class=\"schema-faq-answer\">A. Yes. Choose \u2018Provide your own API key\u2019 during setup. That usage follows OpenAI Platform billing, not your ChatGPT plan allowance.<\/p>\n<\/p><\/div>\n<div class=\"schema-faq-section\" id=\"faq-question-1786701848987\"><strong class=\"schema-faq-question\">Q5. How do I check or remove the active login?<\/strong> <\/p>\n<p class=\"schema-faq-answer\">A. Run codex login status to inspect it. Run codex logout to clear the cached credentials.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"border-top py-3 author-info my-4\">\n<div class=\"author-card d-flex align-items-center\">\n<div class=\"flex-shrink-0 overflow-hidden\">\n                                    <a href=\"https:\/\/www.analyticsvidhya.com\/blog\/author\/vasudeo321\/\" class=\"text-decoration-none active-avatar\"><br \/>\n                                                                       <img decoding=\"async\" src=\"https:\/\/canva.link\/pb0pgpgz6khspof\" width=\"48\" height=\"48\" alt=\"Vasu Deo Sankrityayan\" loading=\"lazy\" class=\"rounded-circle\"\/><br \/>\n                                                                <\/a>\n                                <\/div>\n<\/p><\/div>\n<p>Studying, evaluating, and explaining AI systems for over 6 years.<\/p>\n<p>\u201c\ud835\ude16\ud835\ude2f\ud835\ude24\ud835\ude26 \ud835\ude2e\ud835\ude26\ud835\ude2f \ud835\ude35\ud835\ude36\ud835\ude33\ud835\ude2f\ud835\ude26\ud835\ude25 \ud835\ude35\ud835\ude29\ud835\ude26\ud835\ude2a\ud835\ude33 \ud835\ude35\ud835\ude29\ud835\ude2a\ud835\ude2f\ud835\ude2c\ud835\ude2a\ud835\ude2f\ud835\ude28 \ud835\ude30\ud835\ude37\ud835\ude26\ud835\ude33 \ud835\ude35\ud835\ude30 \ud835\ude2e\ud835\ude22\ud835\ude24\ud835\ude29\ud835\ude2a\ud835\ude2f\ud835\ude26\ud835\ude34 \ud835\ude2a\ud835\ude2f \ud835\ude35\ud835\ude29\ud835\ude26 \ud835\ude29\ud835\ude30\ud835\ude31\ud835\ude26 \ud835\ude35\ud835\ude29\ud835\ude22\ud835\ude35 \ud835\ude35\ud835\ude29\ud835\ude2a\ud835\ude34 \ud835\ude38\ud835\ude30\ud835\ude36\ud835\ude2d\ud835\ude25 \ud835\ude34\ud835\ude26\ud835\ude35 \ud835\ude35\ud835\ude29\ud835\ude26\ud835\ude2e \ud835\ude27\ud835\ude33\ud835\ude26\ud835\ude26. \ud835\ude09\ud835\ude36\ud835\ude35 \ud835\ude35\ud835\ude29\ud835\ude22\ud835\ude35 \ud835\ude30\ud835\ude2f\ud835\ude2d\ud835\ude3a \ud835\ude31\ud835\ude26\ud835\ude33\ud835\ude2e\ud835\ude2a\ud835\ude35\ud835\ude35\ud835\ude26\ud835\ude25 \ud835\ude30\ud835\ude35\ud835\ude29\ud835\ude26\ud835\ude33 \ud835\ude2e\ud835\ude26\ud835\ude2f \ud835\ude38\ud835\ude2a\ud835\ude35\ud835\ude29 \ud835\ude2e\ud835\ude22\ud835\ude24\ud835\ude29\ud835\ude2a\ud835\ude2f\ud835\ude26\ud835\ude34 \ud835\ude35\ud835\ude30 \ud835\ude26\ud835\ude2f\ud835\ude34\ud835\ude2d\ud835\ude22\ud835\ude37\ud835\ude26 \ud835\ude35\ud835\ude29\ud835\ude26\ud835\ude2e.\u201d \u2014 \ud835\udda5\ud835\uddcb\ud835\uddba\ud835\uddc7\ud835\uddc4 \ud835\udda7\ud835\uddbe\ud835\uddcb\ud835\uddbb\ud835\uddbe\ud835\uddcb\ud835\uddcd, \ud835\udda3\ud835\uddce\ud835\uddc7\ud835\uddbe<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<p><h4 class=\"fs-24 text-dark\">Login to continue reading and enjoy expert-curated content.<\/h4>\n<p>                        <button class=\"btn btn-primary mx-auto d-table\" data-bs-toggle=\"modal\" data-bs-target=\"#loginModal\" id=\"readMoreBtn\">Keep Reading for Free<\/button>\n                    <\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>If you have already used\u00a0Codex in ChatGPT, the Codex CLI will feel familiar. It brings the same AI assistance directly into your local development environment, where it can work with your repository, shell, tests, and other tools. Installation takes only one command, but the setup choices that follow are worth reviewing carefully.\u00a0In this article, you\u2019ll [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7039266,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12033],"tags":[75810,41946,2059,8821,7003,11372],"dealstore":[],"offerexpiration":[],"class_list":["post-7039265","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analytics","tag-cli","tag-codex","tag-guide","tag-install","tag-setup","tag-stepbystep"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Install Codex CLI: A Step-by-Step Setup Guide - Som2ny Network<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fivemor.com\/?p=7039265\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Install Codex CLI: A Step-by-Step Setup Guide - Som2ny Network\" \/>\n<meta property=\"og:description\" content=\"If you have already used\u00a0Codex in ChatGPT, the Codex CLI will feel familiar. 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