Some models, for example Opus 4.7 and GPT 5.5, are only available on Pro+; Pro+ has audit logs and GitHub Spark; that's about it, as far as I can tell from https://docs.github.com/en/enterprise-cloud@latest/copilot/g...
When I see how fast Codex max thinking GPT 5.5 eats our enterprise seat credits almost anything else seems cheap (until we switch our live systems from 5.4 api to 5.5 api I guess)... good thing I'm not the one paying for those credits and tokens (which is probably how most of the money is going to be made on AI going forward, borderline free chatbots for normies are done)
5.3-Codex is really good enough, Sonnet 4.6 is good enough.