Is GPT Workspace part of ChatGPT Plus or Enterprise?

No, even if you have ChatGPT Plus or Enterprise you will need to pay a new subscription as GPT Workspace is different from ChatGPT and not affiliated in any way or form with OpenAI.

You can see our pricing on our pricing page.

The other way round is also true: a GPT Workspace plan does not include ChatGPT, and OpenAI cannot help with a GPT Workspace charge or account. If a card statement shows WWW.GPT.SPACE or GPT Workspace, see I don’t recognize a charge from GPT Workspace.