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This is a follow-up for https://github.com/openai/codex/pull/13047 ## Why We had a race where `turn/started` could be observed before the thread had actually transitioned to `Active`. This was because we eagerly emitted `turn/started` in the request handler for `turn/start` (and `review/start`). That was showing up as flaky `thread/resume` tests, but the real issue was broader: a client could see `turn/started` and still get back an idle thread immediately afterward. The first idea was to eagerly call `thread_watch_manager.note_turn_started(...)` from the `turn/start` request path. That turns out to be unsafe, because `submit(Op::UserInput)` only queues work. If a turn starts and completes quickly, request-path bookkeeping can race with the real lifecycle events and leave stale running state behind. **The real fix** is to move `turn/started` to emit only after the turn _actually_ starts, so we do that by waiting for the `EventMsg::TurnStarted` notification emitted by codex core. We do this for both `turn/start` and `review/start`. I also verified this change is safe for our first-party codex apps - they don't have any assumptions that `turn/started` is emitted before the RPC response to `turn/start` (which is correct anyway). I also removed `single_client_mode` since it isn't really necessary now. ## Testing - `cargo test -p codex-app-server thread_resume -- --nocapture` - `cargo test -p codex-app-server 'suite::v2::turn_start::turn_start_emits_notifications_and_accepts_model_override' -- --exact --nocapture` - `cargo test -p codex-app-server`
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, 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.