iOS 26 native transcriptions are great. iOS 25 and before fall back to whisper, which nostr:npub1995y964wmxl94crx3ksfley24szjr390skdd237ex9z7ttp5c9lqld8vtf was using earlier today. Whisper requires a bit slower speaking cadence.
If transcriptions are bad, no one will read your post. Or they will eventually unfollow you.