OpenAI: no big deal — sign up, pick your number of seats, and you’re all set.
Anthropic: also no big deal but there’s an obnoxious minimum purchase.
Google: first you have to try to figure out what the product is called. Then you need to figure out how to set the correct IAM rules. Then you have to sign up and pay for it. Maybe you succeed. Maybe you give up after an hour or two of cursing. Gemini is, of course, completely unable to help. (OpenAI clearly has not trained their models on how to operate their tools. Google’s models hallucinate Google’s product offerings so outrageously that I’m not sure I could tell. I haven’t asked Claude about Claude Code.)
At least the monthly pricing is similar once you get over the hurdles.