Yes they do IntelliJ IDEA Ultimate and IntelliJ IDEA Community are separate IDEs.

> The JetBrains IDEs don't have an ultimate version, I think you're thinking of VSCode.

This is not true. I installed intellij community, searched through it's plugins for http clients, and Jetbrains' plugin shows up all greyed out with the message "ultimate only".

The OP most likely meant the paid version of JetBrains IDEs

VSCode does not have an ultimate version.