Gemini 3.8 TTS Playground

西蒙·威利森，Simon Willison 的个人博客，关于 Python、Django、开源、AI 与数据新闻。Django 框架联合创始人。关注

Google released two new Gemini text-to-speech models today - gemini-3.8-flash-tts and gemini-3.8-flash-lite-tts.

They come with a library of over 2,000 voices, plus the ability to create a custom voice with "just a 30-second audio sample of your voice or a voice you have the rights to use".

I vibe coded this bring-your-own-key playground interface with GPT-6 Astra, taking advantage of the open CORS policy of the underlying Gemini API.

Screenshot of a web app for composing multi-speaker text-to-speech conversations, with a Compose panel on the left and Connection and Under the hood panels on the right. Left panel: "01 Compose" with a "Load example" button. "Compose settings are saved in the URL for bookmarking or sharing. Your API key is excluded." Toggle with "Single voice" and "Conversation" (Conversation selected). "Cast" section with "+ Add speaker" button. Speaker "Gus", Voice "Puck", with a remove × button. Speaker "P...

A notable feature of the API is that it makes it easy to define a full conversation between multiple characters, each with different voices and voice style instructions.

Here's a short demo clip of a conversation between two pelicans debating if they should move to the Pacifica Pier. I had Claude 4.5 Opus and generate a URL to render it using the tool.

It took ~20 seconds to generate 1m 18s of audio using Gemini 3.8 Flash TTS (not the cheaper Flash-Lite), at a cost of 2.74 cents.

Tags: text-to-speech, gemini

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