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Eric Traut
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## Why Codex currently omits a configured `service_tier` when the selected model's catalog entry does not advertise support for it. That fallback is silent, so users can unknowingly send requests at the default tier instead. This makes cases such as #26604 difficult to diagnose. ## What changed - Emit the shared core `Warning` event during session startup when a configured service tier will be omitted because the initial model does not advertise support for it. - Do not warn on later model or service-tier changes, which keeps warning emission stateless and avoids client-specific handling. - Keep the existing request filtering behavior unchanged. ## Validation - `just test -p codex-core unsupported_service_tier` - `just test -p codex-core unsupported_configured_service_tier_warns_at_session_start` ### Manual validation - Launched the real TUI with the bundled catalog, where `gpt-5.5` advertises the `priority` tier but not `flex`, and configured `service_tier = "flex"`. - Confirmed the unsupported-tier warning appeared exactly once during startup. - Submitted two turns through a local Responses API SSE stub; both received mock replies and neither emitted another warning. - Inspected both captured `/v1/responses` request bodies and confirmed that neither contained a `service_tier` field. - Repeated the two-turn TUI flow against the live Responses API; both turns completed and the warning was not repeated.
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.