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Gemini TTS playground demonstrates multi-speaker dialogue and custom voices

simonwillison.net Editor score 7/10

A playground for Gemini’s new TTS models demonstrates multi-character conversations and custom voices; generating 1 minute 18 seconds of audio took about 20 seconds and cost 2.74 cents. The API features and cost give engineers concrete input for evaluating speech generation.

What

Gemini 3.8 TTS Playground lets users compose and preview single-voice narration or multi-speaker conversations through Google's text-to-speech API.

How

The API assigns different voices and style instructions to characters; custom voices can be made from a 30-second audio sample.

Why it matters

Engineers can experiment with speech generation, inspect request and response details, and share settings through bookmarkable URLs.

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