if your decision is cost-oriented, then Whisper API is the cheapest - at least based on what other API companies promote on their websites. however, depending

if your decision is cost-oriented, then Whisper API is the cheapest - at least based on what other API companies promote on their websites. however, depending on what you're building, you may consider local speech-to-text by running speech-to-text on user's devices, basically you do not pay for the cloud. you should understand whether you'll need model adaptation -like adding custom industry jargon or so. whisper might be challenging.