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## Why Some consumers expect conventional hyphenated HTTP headers. Codex already sends the session and thread IDs on outbound Responses requests, but it only uses the underscore spellings today, which makes those IDs harder to consume in systems that normalize or reject underscore header names. Full context here: https://openai.slack.com/archives/C08KCGLSPSQ/p1778248578422369 ## What changed - `build_session_headers` now emits both `session_id` and `session-id` when a session ID is present. - It does the same for `thread_id` and `thread-id`. - Added regression coverage in `codex-api/tests/clients.rs` and `core/tests/suite/client.rs` so both the lower-level client tests and the end-to-end request tests assert the two header spellings are present. ## Test plan - Added header assertions in `codex-api/tests/clients.rs`. - Added request-header assertions in `core/tests/suite/client.rs` for both the `/v1/responses` and `/api/codex/responses` request paths.
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.