Hi @bbutler Sorry for the delay on this. Thanks for asking. The old local “Use Multiple Models” checkbox is no longer shown in the editor model picker.
There is still a Best-of-N workflow, but availability depends on the surface:
In the editor window, /best-of-n is only available for Git-backed workspaces. If the window is opened on a parent folder that is not itself a Git repo, or a multi-root workspace where one folder is not a Git repo, the command may not appear.
In the newer Agents view, the /best-of-n slash command is not currently exposed there. Worktree support is handled through the Agents Window flow instead.