Five questions to narrow the field, using only what each vendor's own pages say. It tells you what the pages confirm, where they disagree, and what you still need to ask.
Pick an option to see all eight fields, with the page each one came from. A question mark means the answer was not found on that vendor's pages. It does not mean the answer is no.
Ask for the answers in writing. Anything marked with a question mark or a tilde above is a good place to start.
This is an exploratory snapshot of what each vendor's public pages said on October 8, 2026. Pages were read through a fetch tool that can paraphrase, so quotes are close but not guaranteed word for word. It is not legal, security or compliance advice. Plans, prices and terms change, and your plan may differ from the one a page describes. Before you move a GPT, read the vendor's current pages and contract yourself and ask in writing. Nothing here has been confirmed with any vendor.