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Shijie Rao
927004c06d
## Why Ultra reasoning may proactively use multiple agents. When `features.multi_agent_v2.max_concurrent_threads_per_session` is configured at 8 or higher, explicitly selecting Ultra can allow up to `N - 1` subagents to work concurrently and increase usage quickly. Showing the configured limits at selection time makes that tradeoff visible and points users to the setting that controls it. ## What changed - Show a warning history cell after the user explicitly selects Ultra reasoning with a concurrent-thread limit of at least 8. - Include the configured concurrent-thread count and maximum subagent count in the warning. - Apply the warning consistently across model and reasoning pickers, Plan-mode scope selection, and reasoning shortcuts. - Keep the trigger limited to the selected reasoning effort and configured thread limit, independent of how multi-agent v2 is activated. - Add focused threshold coverage and an `insta` snapshot for the rendered warning. ## User impact Users with high multi-agent concurrency receive a concrete warning immediately after selecting Ultra. Other reasoning efforts, limits below 8, and startup behavior are unchanged. https://github.com/user-attachments/assets/5795bcb9-432e-42bc-bde3-ee363e9aeb69 ## Test plan - `just test -p codex-tui ultra_reasoning_selection` - Built the full debug CLI with `cargo build -p codex-cli`. - Manually verified the debug TUI with a 10-thread limit: switching from Max to Ultra displayed the warning with 10 concurrent threads and up to 9 subagents.
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.