I did a lot of research into this about 6 months ago, and the best price I could find/negotiate from the competition was 0.55/hr which included multi thousand dollar upfront commitments. This is 0.36/hr, and if you do a bit of setup work yourself you can bring it to about 0.09/hr. OpenAI offering hosted Whisper is a really good deal, and if you find it to be good for your application, then spending the time to host it yourself is perfect validation.