## Why WebSocket continuations only send the new part of a request. Checking whether a request could be continued was cloning the full previous request, the current request, and their input history. For long conversations or large tool lists, that meant copying several request-sized values on every continuation. ## What changed - compare the request settings by reference - check the previous input and server response as borrowed prefixes - allocate only the new input items that will be sent The reuse rules stay the same, including ignoring `client_metadata` for this check. The comparison is still `O(n)`, but it removes several `O(n)` allocations and copies. Temporary memory no longer grows by multiple full request sizes for each continuation. ## Performance Local rollout traces show continuation checks on turns around 260k input tokens. Before this change the reuse gate cloned the previous request, the current request, and the previous input history before deciding whether it could continue incrementally. After this change it borrows those structures and allocates only the incremental tail. For large continuations with a small delta, that removes roughly three request-sized copies from the hot path and reduces temporary memory from multiple full request sizes to just the new tail. ## Validation - `just test -p codex-core responses_websocket_v2_creates_with_previous_response_id_on_prefix` - `just test -p codex-core responses_websocket_v2_creates_without_previous_response_id_when_non_input_fields_change`
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.
