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## Why `turn/start` already accepts an input array on the wire, including an empty array, but core treated empty input as a no-op before the turn could reach the model. App-server clients need to be able to start a real turn even when there is no new user message, for example to let the model proceed from existing thread context. ## What changed - Removed the `run_turn` early return that skipped empty-input turns when there was no pending input. - Kept empty active-turn steering rejected by moving the `steer_input` empty-input check until after core has determined whether there is an active regular turn. - Empty regular turns now refresh `previous_turn_settings` like other regular turns, so follow-up context injection state advances consistently. - Added an app-server v2 integration test proving `turn/start` with `input: []` emits started/completed notifications, sends one Responses request, and does not synthesize an empty user message. ## Validation - `cargo test -p codex-app-server --test all turn_start_with_empty_input_runs_model_request`
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.