Is this right? The current best TTS from OpenAI uses gpt-4o-audio-preview which is $2.50 input text, $80 output audio, the new gpt-4o-mini-tts is $0.60 input text, $12 output audio. An average 5x price reduction.

Going the other way, transcribe with gpt-4o-audio-preview price was $40 input audio, $10 output text, the new gpt-4o-transcribe is $6 input audio and $10 output text. Like a 7x reduction on the input price.

TTS/Transcribe with gpt-4o-audio-preview was a hack where you had to prompt with 'listen/speak this sentence:' and it often got it wrong. These new dedicated models are exactly what we needed.

I'm currently using the Google TTS API which is really good, fast and cheap. They charges $16 per million characters which is exactly the same as OpenAI's $0.015 per minute estimate.

Unfortunately it's not really worth switching over if the costs are exactly the same. Transcription on the other hand is 1.6¢/minute with Google and 0.6¢/minute with OpenAI now, that might be worth switching over for.