Cached input audio_tokens is always 0

[_j]

I would take up the offer “if you have any session IDs to debug”:

New Realtime API voices and cache pricing

Today we’re adding five new voices that you can use with the Realtime API: Ash, Ballad, Coral, Sage, and Verse. These voices are much more expressive and you can better tune their emotions, accents, and tones to your needs. Take a listen. We’re also making our first cost reduction for Realtime with, prompt caching: Text input that hits the cache costs 50% less. Audio input that hits the cache costs 80% less. Basically, your typical 15 minute conversation costs about 30% less now than when we…

Remember: cache times out quickly. You might be there listening to the AI blather for five minutes, and the cache expires at that low end of expected time.