llm-openai-codex 0.2.1

Access OpenAI models via a Codex subscription

llm-openai-codex

LLM plugin for accessing ChatGPT/Codex-backed OpenAI models through the Responses API.

This project is forked from and based on Simon Willison's llm-openai-via-codex.

Changes from the original plugin

• Package renamed to llm-openai-codex.
• Model prefix changed to codex/.
• Plugin-owned auth is stored in LLM's user config directory as auth-codex.json, with read-only fallback to ${CODEX_HOME:-~/.codex}/auth.json.
• llm codex auth commands manage login, import, status, refresh, and logout.
• Explicit verbosity option maps to Responses API text.verbosity.
• Extra Responses API options are forwarded when LLM accepts them.
• Missing account_id values are derived from OAuth JWT claims when possible.
• Added llm codex usage showing current Codex plan usage.

Installation

Install this plugin in the same environment as LLM.

llm install llm-openai-codex

Usage

Authenticate the plugin:

llm codex login [--device-code]

If you already use Codex CLI, the plugin can fall back to ${CODEX_HOME:-~/.codex}/auth.json when auth-codex.json does not exist. You can also copy those tokens into plugin-owned auth with llm codex import.

List available Codex-backed models:

llm models -q codex

Run a prompt:

llm -m codex/gpt-5.5 "Hello"

Use Responses API verbosity:

llm -m codex/gpt-5.5 -o verbosity low "Summarize this"

Auth commands

llm codex login
llm codex login --device-code
llm codex status
llm codex refresh
llm codex usage
llm codex import
llm codex logout

Auth source order:

1. Plugin-owned auth-codex.json
2. Read-only Codex CLI auth at ${CODEX_HOME:-~/.codex}/auth.json

llm codex import copies ChatGPT OAuth tokens from Codex CLI auth into plugin-owned auth-codex.json. It refuses to overwrite an existing auth-codex.json; run llm codex logout first if you want to replace plugin-owned auth.

When using Codex CLI auth fallback, this plugin does not refresh or delete the shared Codex CLI auth file. If those tokens expire, run Codex CLI to refresh them, or run llm codex login [--device-code] to create plugin-owned auth. llm codex status shows which auth source is active.

When authentication is missing or expired, run llm codex login [--device-code] or llm codex import.

Development

uv run pytest
uv run llm plugins
uv run llm codex status