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### Summary This adds turn-level latency metrics for the first model output and the first completed agent message. - `codex.turn.ttft.duration_ms` starts at turn start and records on the first output signal we see from the model. That includes normal assistant text, reasoning deltas, and non-text outputs like tool-call items. - `codex.turn.ttfm.duration_ms` also starts at turn start, but it records when the first agent message finishes streaming rather than when its first delta arrives. ### Implementation notes The timing is tracked in codex-core, not app-server, so the definition stays consistent across CLI, TUI, and app-server clients. I reused the existing turn lifecycle boundary that already drives `codex.turn.e2e_duration_ms`, stored the turn start timestamp in turn state, and record each metric once per turn. I also wired the new metric names into the OTEL runtime metrics summary so they show up in the same in-memory/debug snapshot path as the existing timing metrics.
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.