CarPlay could soon support more than just Siri, as Apple explores wider access for third-party voice tools.

Apple may open CarPlay to third-party AI assistants

Apple may open CarPlay to third-party AI assistants
It looks as though Apple is gearing up to allow third-party chatbots on CarPlay. This would allow users to query voice-enabled chatbots directly through the CarPlay interface.
Until now, Apple has kept voice assistants off CarPlay, save for its first-party assistant, Siri. However, with the slow rollout of the new, more personal Siri, Apple may feel the pressure to give its users options.