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## Why `ActiveTurn` already runs at most one task: starting a task requires that no task is present, and replacement aborts existing work first. Representing that state as an `IndexMap` leaves a multi-task shape for a single-task invariant and makes each lifecycle lookup operate like a collection lookup. The slot remains optional because goal continuation uses an empty active turn as a reservation while deciding whether to start continuation work. ## What changed - Replace `ActiveTurn.tasks` with `task: Option<RunningTask>`. - Update task abort/completion, session lookup and steering, input-queue matching, goal reservation, and network-approval lookup to operate on the singular slot. - Mutate the singular task slot directly instead of retaining collection-era add/remove/take helpers. - Record token usage on the completing active task span without a regular-task-only opt-in flag. ## Validation - `cargo test -p codex-core --lib session::tests::steer_input` - `cargo test -p codex-core --lib session::tests::abort_empty_active_turn_preserves_pending_input` - `cargo test -p codex-core --lib session::tests::queued_response_items_for_next_turn_move_into_next_active_turn` - `cargo test -p codex-core --lib session::tests::active_goal_continuation_runs_again_after_no_tool_turn` - `cargo test -p codex-core --lib session::tests::abort_regular_task_emits_turn_aborted_only` - `cargo test -p codex-core --lib session::input_queue::tests`
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.