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## Why Codex TUI startup still feels slower than 0.117.0 after the app-server move in 0.118.0. A visible chunk of launch-to-input latency comes from serial terminal startup probes: cursor position, keyboard enhancement support, and default foreground/background color queries can each wait on terminal responses before the first usable frame. Refs #16335. ## What This PR batches the terminal startup probes into one bounded probe. It also reuses the probed cursor position and default colors during TUI setup, fast-paths the primary-device-attributes fallback as keyboard enhancement unsupported, and keeps lightweight startup timing logs for future tuning. The startup telemetry is intentionally left in production: it records phase timings for terminal probes and initial-frame scheduling so future startup regressions can be diagnosed from normal logs rather than re-adding one-off debug instrumentation. ## Benchmark In the local pty startup benchmark, the pre-optimization `main` baseline was about 250.5ms median from launch to accepted chat input. This probe-only branch measured about 152ms median, for an approximate savings of 95-100ms. ## Stack 1. [#23175: [1 of 2] Optimize TUI startup terminal probes](https://github.com/openai/codex/pull/23175) — this PR 2. [#23176: [2 of 2] Start fresh TUI thread in background](https://github.com/openai/codex/pull/23176) — layered on this PR ## Verification - `cargo test -p codex-tui`
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.