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Text-to-speech has reached a whole new level of quality and personalization. With Google's Gemini 3.8 Flash TTS, you can design custom voices from text prompts, steer delivery nuances (whispers, pacing, emotion), and clone voices. And you can do it all in #Java! 🧵👇

Guillaume Laforge

@glaforge.dev

To hear what this sounds like in practice, watch this demo video: 👉 www.youtube.com/watch?v=FL6... It gives a great taste of how natural the voice quality is, and how prompt-based voice design lets you shape distinct vocal personas with realistic cadence.

youtube.comCreate your own voices with Gemini 3.8 text-to-speechDesign entirely new vocal personas from scratch for gaming, immersi...

Guillaume Laforge

@glaforge.dev

I just released v2.0.2 of my Gemini Interactions Java SDK to support these new TTS capabilities: • Voice.prompted(...) for prompt-based voice design • Voice.replicated(...) for voice cloning • Content.speech(text, style) for emotional steering • Direct audio preview access

24/9/26, 12:07 pm0 reposts0 likes

Guillaume Laforge

@glaforge.dev

Designing a custom voice in Java takes just a few lines: Voice voice = client.createVoice(Voice.prompted( "A calm, deep French voice, speaking slowly", "French Philosopher", "Gemini 3.8 Flash TTS" )); Pass voice.id() to VoiceConfig. Done.

Guillaume Laforge

@glaforge.dev

Walkthrough & code: 👉 glaforge.dev/posts/2026/... Release notes: 👉 github.com/glaforge/ge... What creative voice applications would you build? Let me know!

github.comRelease Release v2.0.2 · glaforge/gemini-interactions-api-sdk🎙️ What's New in v2.0.2 This release introduces comprehensive support for the new Gemini 3.8 Flash TTS models, along with first-class Voice Design, Voice Replication, and conversational turn st...