There's no evidence there's any 5.5 Pro model distinct from 5.5 xhigh or whatever.
https://developers.openai.com/api/docs/models
https://developers.openai.com/api/docs/models/gpt-5.5-pro is a thing
lol
(tap view all on yr link or ask gpt to search for you next time)
https://developers.openai.com/api/docs/models/gpt-5.5-pro is a thing
lol
(tap view all on yr link or ask gpt to search for you next time)