Gemini 3.8 TTS adds custom voice creation from a short recording or prompt

Gemini 3.8 TTS lets users replicate their own voice or design a custom voice from a text prompt. The workflow is to record about 20 seconds of speech with a consent sentence, create the voice through an API call, then use it in any request with styles set in speech_metadata. The author also points readers to a guide for setting up and testing the process with an agent.