# Oc Codex Setup > Install or refresh oc-codex-multi-auth in OpenCode, choose the right config mode, and verify Codex OAuth with ChatGPT Plus or Pro access. Use when this capability is needed. - Skill: `tomevault-io/oc-codex-setup` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/oc-codex-setup` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/oc-codex-setup/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Integrations & APIs - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/oc-codex-setup --- # oc-codex-setup Use this skill when the user wants to install, reinstall, upgrade, or troubleshoot `oc-codex-multi-auth` in OpenCode. ## Default install ```bash npx -y oc-codex-multi-auth@latest ``` Use this when the user wants the full catalog config, including base entries like `gpt-5.5` and explicit preset entries like `gpt-5.5-medium`. ## Modern compact install ```bash npx -y oc-codex-multi-auth@latest --modern ``` Use this on OpenCode `v1.0.210+` when the user wants the compact variant-based config. ## Login and verification 1. Run `opencode auth login`. 2. Run a quick verification request: ```bash opencode run "Explain this repository" --model=openai/gpt-5.5-medium ``` 3. For a Codex-focused workflow, try: ```bash opencode run "Refactor the retry logic and update the tests" --model=openai/gpt-5-codex --variant=high ``` ## Troubleshooting - Confirm `"plugin": ["oc-codex-multi-auth"]` is present in the OpenCode config. - Re-run `opencode auth login` if tokens expired or the wrong workspace was selected. - Inspect `~/.opencode/logs/codex-plugin/` after a failed request. - Set `ENABLE_PLUGIN_REQUEST_LOGGING=1` for deeper request logging. - For full docs, see `docs/getting-started.md`, `docs/configuration.md`, `docs/troubleshooting.md`, and `docs/faq.md`. ## Usage boundaries This project is for personal development use with your own ChatGPT Plus or Pro subscription. For production or shared services, prefer the OpenAI Platform API. --- > Source: [ndycode/oc-codex-multi-auth](https://github.com/ndycode/oc-codex-multi-auth) — distributed by [TomeVault](https://tomevault.io).