# Gemini 3.8 TTS Playground > Source: > Published: 2026-09-23 17:12:27+00:00 **Tool:** [Gemini 3.8 TTS Playground](https://tools.simonwillison.net/gemini-tts-playground) Google [released two new Gemini text-to-speech models](https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-8-text-to-speech/) 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](https://tools.simonwillison.net/markdown-svg-renderer?url=https%3A%2F%2Fgist.github.com%2Fsimonw%2Fa82f3aef2677c623d1776092d6b21224) this bring-your-own-key playground interface with GPT-6 Astra, taking advantage of the open CORS policy of the underlying Gemini API. 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](https://simonwillison.net/2026/Sep/12/sighting-399708714/). I had Claude 4.5 Opus [write the script](https://claude.ai/share/3597fc77-9323-4583-aeb9-b0e4c3f654a3) and generate [a URL to render it using the tool](https://simonwillison.net/u/vj). 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](https://simonwillison.net/tags/text-to-speech), [gemini](https://simonwillison.net/tags/gemini)