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Tamir Duberstein
e23d4df4ff
The release profile still uses one codegen unit, which serializes LLVM code generation within each crate. That setting was selected alongside fat LTO for optimization quality and binary size, but releases now use ThinLTO and code generation dominates the critical-path build. Use four codegen units. On an Apple M4 Max with 16 cores and 128 GiB RAM, using rustc 1.96.0, four and eight units took 507.486 and 505.325 seconds respectively. Four therefore keeps the build-time gain while limiting the stripped `codex` increase to 14.7%, compared with 21.5% at eight units. The gzip-compressed binary grows 7.8% at four units. The one-unit build from an empty target directory took 981.150 seconds. That comparison also populated dependency and native build caches, so it is directional rather than controlled. It agrees with the earlier clean matrix where eight units reduced 671 seconds to 303 seconds: https://gist.github.com/anp/4b88393a0acd35783d9f42156f3243d5 At the local 48% reduction, the current release's 55m22s critical-path macOS Cargo step would save about 26 minutes from the 71m28s workflow: https://github.com/openai/codex/actions/runs/27367405663 The prompt-image medians ranged from 3.9% faster to 0.9% slower. CLI startup shifted by 1-2 ms while user and system CPU time were unchanged. This is a draft because the release-latency improvement may not justify the binary-size increase.
e23d4df4ff
·
2026-06-11 19:44:36 -07:00
7,379 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.