[
    {
        "role": "user",
        "content": "I%20have%20a%20OpenAI%20ChatGPT%20API%20Key%2C%20that%20I%20got%20to%20use%20with%20Leasey%20for%20JAWS.%20Can%20I%20use%20that%20same%20API%20Key%20with%20OpenAI%27s%20Codex%20or%20perhaps%20the%20CLI%20tool%3F"
    },
    {
        "role": "assistant",
        "content": "Yes \u2014 in many cases, you *can* use the same OpenAI API key you use with Leasey for JAWS with OpenAI\u2019s Codex or the Codex CLI, *but* whether you *should*, or whether it *works the same*, depends on how you\u2019re authenticated and which product/features you want to access. Here\u2019s how it all works, and what to be careful of.  \n\n---\n\n## \ud83d\udd10 What kinds of keys/accounts/authentication there are\n\nOpenAI supports a few different ways to authenticate and use tools like Codex:\n\n1. **API Key**: From the OpenAI platform. This gives you usage-based billing via your API quota.  \n2. **ChatGPT subscription / plan (Plus, Pro, Business, etc.)**: For Codex and Codex-CLI especially, you can often sign in using your ChatGPT account instead of explicitly providing an API key. That uses the entitlements/billing of your ChatGPT plan. ([help.openai.com](https://help.openai.com/en/articles/11369540-using-codex-with-your-chatgpt-plan?utm_source=openai))\n\n---\n\n## \u2705 Using your OPENAI_API_KEY with Codex / Codex CLI\n\nYes \u2014 Codex CLI supports using an OpenAI API key. You can export your key as an environment variable, and Codex will use it. ([help.openai.com](https://help.openai.com/en/articles/11096431-openai-codex-ligetting-started?utm_source=openai))\n\n- For example, after installing the CLI (e.g. via `npm install -g @openai/codex`), you can do:\n  ```\n  export OPENAI_API_KEY=\"sk-your-key-here\"\n  codex ...\n  ```\n  This makes Codex CLI use that API key. ([docs.praison.ai](https://docs.praison.ai/docs/cli/codex-cli?utm_source=openai))\n\n- If you're using ChatGPT plan credentials (e.g. you logged in with ChatGPT via `codex login`), an API key is often created \u201cunder the hood\u201d for billing/credentials purposes. Even users who think they\u2019re only using their subscription are often being backed by an API key. ([github.com](https://github.com/openai/codex/issues/2000?timeline_page=1&utm_source=openai))\n\n---\n\n## \u26a0\ufe0f What to check / possible limitations\n\nHere are some important caveats:\n\n- **Model availability**: Not all Codex models might be available via API key. Some newer ones (e.g. \u201cGPT-5.3-Codex\u201d) are often initially gated to certain subscribers or via the ChatGPT login flow. ([en.wikipedia.org](https://en.wikipedia.org/wiki/GPT-5.3-Codex?utm_source=openai))  \n- **Rate limits**: The limits when using API key auth are tied to your OpenAI API quota and organization tier. Sign-in via ChatGPT tends to use subscription-based limits. They\u2019re distinct. ([codexlog.dev](https://codexlog.dev/guides/troubleshooting/codex-rate-limits-explained/?utm_source=openai))  \n- **Billing**: If you use an API key, you\u2019ll be billed per token via your API account. If you use your ChatGPT Plus/Pro plan via \u201clogin\u201d, sometimes the usage may come from your subscription credits or entitlements (depending on the product) rather than API billing. But bug reports show that *even with ChatGPT login*, an auto-created API key is often used (and billed) behind the scenes. ([github.com](https://github.com/openai/codex/issues/2000?timeline_page=1&utm_source=openai))  \n- **Separation of products**: JAWS + Leasey may use certain models or have special access; those may or may not match what Codex CLI uses under your plan or key. Differences in model names, versions, or available capabilities (for example agentic functionality, \u201cauto-edit\u201d, \u201cfull auto\u201d, etc.) depend on which path you authenticate and what your plan allows.  \n\n---\n\n## \ud83d\udca1 Specifically for your case: Leasey / JAWS \u2192 Codex / CLI\n\nYou said you have an OpenAI API key that you used for Leasey for JAWS. In principle, you *can* use that same key with Codex CLI or Codex as long as:\n\n- The key is active and has the required permissions/quota.  \n- The model you want to use is available via the API (some are gated).  \n- You're okay with usage being charged via that key\u2019s billing.  \n\nIf instead you want to use Codex under a ChatGPT subscription, you can \u201clogin with ChatGPT\u201d in Codex CLI, which sometimes will auto-create or link an API key. But note: even in that scenario, you might still see API billing in your OpenAI account. ([github.com](https://github.com/openai/codex/issues/2000?timeline_page=1&utm_source=openai))\n\n---\n\nIf you like, I can check whether **your specific OpenAI API key** (depending on your account tier) can access *the latest Codex models* (for example, GPT-5.3-Codex), under current policy. Do you want me to check that?"
    }
]