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AI usage limit reset times and history

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Is signing in to Codex with ChatGPT billed the same as using an API key?

Applies to: CODEXLast reviewed: Reviewed by Editor
TL;DR

No. Signing in with ChatGPT uses your ChatGPT plan's limits and billing; an API key is billed at API pricing.

Full answer and how it works

When you sign in to Codex with your ChatGPT account, you use the ChatGPT/Codex plan limits available to that account. When you use your own API key, you're billed at API platform pricing under your organization's settings.

When troubleshooting usage limits, first check which sign-in method your client is using.

Sources

Where can I see how much Codex usage I have left and when it resets?

Check the Usage page in the product first. In an active Codex CLI session you can also run /status.

Do ChatGPT Work and Codex share usage limits?

On some plans they share an agentic allowance and credits. Your account and workspace settings show the exact rules.