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## Summary This PR updates the goal continuation prompt to address feedback from early adopters. There are two primary changes: 1. Goal continuation and budget-limit steering prompts now use hidden user-context messages instead of hidden developer messages. 2. The goal continuation prompt is refined to improve the model's ability to fully complete the active goal rather than stop at a smaller or merely passing subset. The user-message transition is important for two reasons. First, it eliminates an issue where older steering messages could be responded to again after a new turn. Second, it works better with compaction because user messages are treated differently from developer messages during compaction. The prompt refinements make persistence explicit, ground work in current evidence, encourage `update_plan` for multi-step progress visibility, and require stronger completion audits before calling `update_goal`. It also removes the elapsed-time reporting in the prompt; I saw evidence that this was causing the model to shortcut work as it became nervous about time. These changes were tested with evals. Chriss4123 has also been running independent evals in [#19910](https://github.com/openai/codex/issues/19910), and many of the improvements in this PR were suggested by him. ## Verification - Tested with evals. - Added and updated focused `codex-core` coverage for hidden goal user context, continuation and budget-limit request shape, prompt rendering, and objective delimiter escaping.
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.