Charlie Marsh
330ae6a516
## Summary Resuming a persisted thread currently deep-clones its complete rollout history several times. `InitialHistory` is retained for the app-server response, copied into thread persistence, and copied again by read-only accessors. These copies scale with the complete rollout rather than the bounded model context and add measurable latency for large sessions. This change stores resumed rollout history in `Arc<Vec<RolloutItem>>`. Rollout loading wraps the parsed vector once, while app-server response construction, session initialization, and thread persistence share it through inexpensive `Arc` clones. Read-only history access now returns a borrowed slice, and fork paths use `Arc::unwrap_or_clone` where they genuinely need mutable ownership. Rollout reconstruction also consumes its temporary context instead of cloning the reconstructed model history. The serialized representation remains unchanged. In an artificial 123 MB rollout benchmark, sharing resumed history reduced cold resume latency by roughly 9–10%. The affected crates compile with their test targets, all 80 thread-store tests pass, and the Bazel dependency lock remains valid.
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.