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Felipe Coury
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## Why [#18763](https://github.com/openai/codex/pull/18763) added canonical hostname resolution for `remote_sandbox_config`. Requirements composition currently performs that synchronous DNS lookup on every fresh process, even when none of the loaded requirements layers contains `[[remote_sandbox_config]]`. On hosts with slow local DNS resolution, this can add several seconds to Codex startup. ## What - defer hostname resolution until a parsed requirements layer actually contains `remote_sandbox_config` - cache the resolver result once per requirements composition, preserving the existing single-lookup behavior across multiple layers - keep the existing FQDN resolution and per-layer requirements precedence unchanged - cover both the ordinary no-lookup path and the multi-layer single-lookup path ## How to Test On a host where local canonical-name resolution is slow: 1. Start Codex without `[[remote_sandbox_config]]` in any managed requirements layer and confirm startup no longer waits for hostname resolution. 2. Add a matching `[[remote_sandbox_config]]` entry and confirm its `allowed_sandbox_modes` still overrides the layer's top-level value. 3. Add remote sandbox entries to multiple requirements layers and confirm precedence remains unchanged while the hostname is resolved only once. Targeted tests: - `just test -p codex-config hostname_resolver` - `just test -p codex-config` (181 passed)
40e7dda4d2
·
2026-06-16 11:17:41 -04:00
7,520 Commits
Codex CLI is a coding agent from OpenAI that runs locally on your computer.
If you want Codex in your code editor (VS Code, Cursor, Windsurf), install in your IDE.
If you want the desktop app experience, run
codex app or visit the Codex App page.
If you are looking for the cloud-based agent from OpenAI, Codex Web, go to chatgpt.com/codex.
Quickstart
Installing and running Codex CLI
Run the following on Mac or Linux to install Codex CLI:
curl -fsSL https://chatgpt.com/codex/install.sh | sh
Run the following on Windows to install Codex CLI:
powershell -ExecutionPolicy ByPass -c "irm https://chatgpt.com/codex/install.ps1 | iex"
Codex CLI can also be installed via the following package managers:
# Install using npm
npm install -g @openai/codex
# Install using Homebrew
brew install --cask codex
Then simply run codex to get started.
You can also go to the latest GitHub Release and download the appropriate binary for your platform.
Each GitHub Release contains many executables, but in practice, you likely want one of these:
- macOS
- Apple Silicon/arm64:
codex-aarch64-apple-darwin.tar.gz - x86_64 (older Mac hardware):
codex-x86_64-apple-darwin.tar.gz
- Apple Silicon/arm64:
- Linux
- x86_64:
codex-x86_64-unknown-linux-musl.tar.gz - arm64:
codex-aarch64-unknown-linux-musl.tar.gz
- x86_64:
Each archive contains a single entry with the platform baked into the name (e.g., codex-x86_64-unknown-linux-musl), so you likely want to rename it to codex after extracting it.
Using Codex with your ChatGPT plan
Run codex and select Sign in with ChatGPT. We recommend signing into your ChatGPT account to use Codex as part of your Plus, Pro, Business, Edu, or Enterprise plan. Learn more about what's included in your ChatGPT plan.
You can also use Codex with an API key, but this requires additional setup.
Docs
This repository is licensed under the Apache-2.0 License.