Gemini 3.8 text-to-speech says hello

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Gemini 3.8 Flash TTS and Gemini 3.8 Flash-Lite TTS are our most expressive audio generation models yet. Generate custom character voices and direct scene dialogue across Google AI Studio, Gemini API, Gemini Enterprise, Gemini Notebook, and Google Vids.

Director, Research Science, on Behalf of the Gemini Audio Team

Google just launched new AI tools that let you create and customize realistic voices from scratch. You can direct these voices to sound exactly how you want, from their accent to their emotional tone. It’s perfect for making audiobooks, games, or podcasts that sound like real people talking. Plus, they added safety features to make sure these voices are used responsibly.

Today, we’re introducing two new text-to-speech models to the Gemini family, transforming voice generation from static presets into a dynamic creative studio. These models enable creators, developers, and enterprises to create richer, more expressive audio experiences, while enabling improved user experiences in products like Gemini Notebook and Google Vids.

These models complement our fast-growing Gemini Audio family, following 3.5 Live Translate, 3.5 Transcribe, 3.8 Live, and 3.8 Live Extended Thinking.

Scale up from 30 original voices to an infinite library. Whether you need an entirely original character voice or a consistent brand ambassador, our 3.8 Flash TTS model powers a full vocal studio. This enables you to create and use expressive, natural-sounding voices for every moment, while empowering developers and enterprises to easily build custom audio experiences.

Hear how Gemini 3.8 Flash TTS generates a high-energy DJ voice from Melbourne.

Hear how Gemini 3.8 Flash TTS generates a super-tinny, monotone robot voice.

Hear how Gemini 3.8 Flash TTS brings a Japanese dragon to life.

Once you've selected your voices, both TTS models give you precise control over how each line is delivered.

Hear how Gemini 3.8 Flash TTS enables natural, highly expressive conversations for interactive voice agents.

Watch and hear how Gemini 3.8 Flash TTS uses granular script control to build a deeply engaging, immersive audio experience.

See how Gemini 3.8 Flash TTS turns natural language prompts into bespoke vocal personas from scratch.

Watch how Gemini 3.8 Flash TTS enables creators to design custom scenes to bring animated dialogue to life.

See how Gemini 3.8 Flash TTS turns scripts into fully performed dialogue scenes, letting creators direct vocal delivery, and natural turn-taking.

Gemini 3.8 Flash TTS delivers leading voice customization capabilities, securing the #1 overall spot on Hume AI’s Voice Design Benchmark (71.4) and also leading in accent modeling (60.8).

Gemini 3.8 Flash TTS and Gemini 3.8 Flash-Lite TTS enable truly expressive performances without sacrificing reliability, also securing the #1 and #2 spots respectively on Hume AI’s Overall Quality Index. The model shows major improvements on a wide range of use cases such as long-form content and dual-speaker screenplay control compared to Gemini 3.1 Flash TTS.

In blind human preference evaluations on Voice Arena, Gemini 3.8 Flash and Flash-Lite TTS secure top positions amongst competitors in key global languages, including Japanese, Brazilian Portuguese, Vietnamese, Modern Standard Arabic (MSA), Mexican Spanish and Hindi. With support for over 100 languages, these models empower creators, developers, and enterprises to build high-quality, multilingual voice experiences worldwide.

We built our voice creation and replication capabilities with strict safeguards to help protect voice talent, respect identity, and ensure content transparency. For voice replication our system leverages consent verification: users must provide a verbal consent recording from the voice owner that matches the reference speaker before a voice can be created.

More broadly, every audio clip generated by our Gemini Audio models is watermarked with SynthID. This imperceptible watermark is woven directly into the audio output, ensuring AI-generated speech remains detectable to help prevent misinformation. For more details on our approach to safety and responsibility, review the model card.

Starting today, developers can experience these new speech generation capabilities in Google AI Studio. Built like a voice design workspace, you can prompt entirely new vocal identities from scratch or replicate your own voice

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, then bring them directly into a dual-speaker screenplay editor to direct line-by-line delivery.

Try voice replication in Google AI Studio.

By using the Gemini API, developer platforms such as Agora, LiveKit, Pipecat, Vercel enable developers to build and deploy high-performance speech generation experiences with ease.

We’re partnering with companies like Figma, HeyGen, Linguana, Wondercraft, 99.co, and Ollang, who are integrating our latest TTS models to help accelerate global dubbing, localize media with nuanced regional accents, and power conversational voice agents at scale.

Gemini 3.8 Flash TTS is rolling out starting today:

Gemini 3.8 Flash-Lite TTS is rolling out starting today:

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