## Summary Adds the debug CLI entry point for reducing recorded rollout traces. This gives developers a direct way to inspect whether the emitted trace stream reduces into the expected conversation/runtime model. ## Stack This is PR 5/5 in the rollout trace stack. - [#18876](https://github.com/openai/codex/pull/18876): Add rollout trace crate - [#18877](https://github.com/openai/codex/pull/18877): Record core session rollout traces - [#18878](https://github.com/openai/codex/pull/18878): Trace tool and code-mode boundaries - [#18879](https://github.com/openai/codex/pull/18879): Trace sessions and multi-agent edges - [#18880](https://github.com/openai/codex/pull/18880): Add debug trace reduction command ## Review Notes This PR is intentionally last: it depends on the trace crate, core recorder, runtime/tool events, and session/agent edge data all existing. The command should remain a debug/developer tool and avoid adding new runtime behavior. The useful review question is whether the CLI exposes the reducer in the smallest practical way for local inspection without turning the debug command into a supported user-facing workflow.
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 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
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, 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.
