I am a native English speaker who practices my spanish pronunciation using Apple Translate and Siri (I think they use separate models), no matter how hard i try, neither can understand some words with my speaking Spanish with a southern US English accent.

On a professional level, one of my specialties is designing Amazon Connect call centers, its gotten better over the years. But the NLU for English still struggles with my southern accent.

On the other hand, ChatGPT never struggles with my English or Spanish.