Michael Bolin
503186b31f
Codex may run many per-thread proxy instances, so hardcoded proxy ports are brittle and conflict-prone. The previous "ephemeral" approach still had a race: `build()` read `local_addr()` from temporary listeners and dropped them before `run()` rebound the ports. That left a [TOCTOU](https://en.wikipedia.org/wiki/Time-of-check_to_time-of-use) window where the OS (or another process) could reuse the same port, causing intermittent `EADDRINUSE` and partial proxy startup. Change the managed proxy path to reserve real listener sockets up front and keep them alive until startup: - add `ReservedListeners` on `NetworkProxy` to hold HTTP/SOCKS/admin std listeners allocated during `build()` - in managed mode, bind `127.0.0.1:0` for each listener and carry those bound sockets into `run()` instead of rebinding by address later - add `run_*_with_std_listener` entry points for HTTP, SOCKS5, and admin servers so `run()` can start services from already-reserved sockets - keep static/configured ports only when `managed_by_codex(false)`, including explicit `socks_addr` override support - remove fallback synthetic port allocation and add tests for managed ephemeral loopback binding and unmanaged configured-port behavior This makes managed startup deterministic, avoids port collisions, and preserves the intended distinction between Codex-managed ephemeral ports and externally managed fixed ports.
npm i -g @openai/codex
or brew install --cask codex
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 are looking for the cloud-based agent from OpenAI, Codex Web, go to chatgpt.com/codex.
Quickstart
Installing and running Codex CLI
Install globally with your preferred package manager:
# 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, Team, 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.