I built a small little app for a company which transcribes all their customer service calls, does an AI review, makes a podcast of the most problematic ones (th

I built a small little app for a company which transcribes all their customer service calls, does an AI review, makes a podcast of the most problematic ones (they LOVE this.) Probably 20 hours a day of transcription. What are people using for cheap hosted models for this? (I don't want to run my own infrastructure.) I'm currently using Gemini Flash Lite. I don't need real time, it's all batched, clear english... still costs some small $ a month. Figured it should be able to be reduced if there are cheaper models out there....