Google Introduces Gemini 3.8 Flash TTS and Flash-Lite TTS for Expressive Voice Generation

Google Introduces Gemini 3.8 Flash TTS and Flash-Lite TTS for Expressive Voice Generation Google has launched Gemini 3.8 Flash TTS and Gemini 3.8 Flash-Lite TTS, two new audio models designed to shift speech synthesis from static presets to controllable character design and high-volume generation. Gemini 3.8 Flash TTS focuses on character design and creative direction, while Flash-Lite TTS is optimized for cost-efficient, high-volume production. Features include generative voice creation across more than 100 languages, 30-second voice replication, two-speaker scene staging, and scripted non-verbal cues. Gemini 3.8 Flash TTS secured first place on Hume AI's Voice Design Benchmark, with both models leading Hume AI's Overall Quality Index. Safety safeguards include mandatory verbal consent verification for voice replication, SynthID watermarking, and C2PA credentials. Voice Design and Directing Capabilities Gemini 3.8 Flash TTS enables users to generate custom voices from natural language prompts across over 100 languages and dialects, complemented by a library of more than 2,000 production-ready voices. Users can replicate voices using a 30-second audio sample, with a voice remixing feature planned to adjust timbre, pitch, pace, and accent. For performance control, the models support line-by-line stage directions, long-form stability across hours of audio, native two-speaker dialogue staging from a single script, and scripted vocal cues such as sighs, laughter, and active-listening interjections. Evaluation and Benchmark Results Gemini 3.8 Flash TTS attained the top overall score of 71.4 on Hume AI's Voice Design Benchmark and led accent modeling with a score of 60.8. Together, Flash TTS and Flash-Lite TTS placed first and second respectively on Hume AI's Overall Quality Index, showing significant performance gains over Gemini 3.1 Flash TTS. In blind human evaluations on Voice Arena, the models earned leading positions across global languages, including Japanese, Brazilian Portuguese, Vietnamese, Modern Standard Arabic, Mexican Spanish, and Hindi. Safety Protocols and Deployment To prevent unauthorized replication, the system requires a matching verbal consent recording from the reference speaker before a voice can be cloned. In addition, all generated audio includes an imperceptible SynthID watermark woven directly into the output to aid AI detection, alongside C2PA credentials. The models are rolling out via Google AI Studio and the Gemini API, with end-user integration appearing in Gemini Notebook for Flash TTS and Google Vids for Flash-Lite TTS, followed by enterprise API access in Gemini Enterprise.

谷歌发布Gemini 3.8系列文本转语音模型 谷歌推出Gemini 3.8 Flash TTS与Flash-Lite TTS两款文本转语音模型，将静态预设语音转变为支持深度定制与逐句舞台调度的动态音频创作工作室。 Gemini 3.8 Flash TTS主打高表现力角色设计，Flash-Lite TTS聚焦高并发、低成本规模化配音。 支持利用自然语言提示或30秒音频样本定制声音，覆盖100多种语言与2000多个就绪音色。 具备精细的逐句表演指导、长文本音色保持、双人剧本同场对话及笑声、叹气等非语言反应词控制。 在Hume AI语音设计基准中位列第一，并强制采用口头知情同意验证与SynthID音频水印保障安全。 定制声音与剧本级对话调度 Gemini 3.8 Flash TTS允许创作者使用自然语言提示从零构建涵盖100多种语言和方言的角色声音，或通过30秒音频样本克隆特定音色。在生成表现上，模型支持长达数小时的长音频音色稳定输出，允许开发者设置逐句语调、情绪与方言切换，并可在同一脚本中原生调度双人对话，自然插入笑声、叹气及倾听互动声。 基准测试成绩与安全防护机制 评测数据显示，Gemini 3.8 Flash TTS在Hume AI语音设计基准（71.4分）和整体质量指数中均夺得第一，Flash-Lite TTS在质量指数上位居次席，且在Voice Arena盲测的多语种表现中名列前茅。为保护声音所有权，声音复刻功能要求上传声音原作者匹配的口头知情同意录制片段，所有生成音频也均隐形嵌入SynthID水印并附带C2PA凭证以防滥用。 上线渠道与合作伙伴集成 新模型即日起面向开发者在Google AI Studio和Gemini API上线，普通用户可在Gemini Notebook中使用Flash TTS或在Google Vids中使用Flash-Lite TTS，企业版API亦将推出。Figma、HeyGen、Linguana和Wondercraft等合作伙伴已开始集成该技术，用于加速全球化配音、本地化译制与语音智能体构建。

Sep 23, 2026 | 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. Leland Rechis Group Product Manager Alan Cowen Director, Research Science, on Behalf of the Gemini Audio Team 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 . Gemini 3.8 Flash TTS: Built for deep creative direction and character design. Create entirely new voices from scratch using natural language prompts to bring characters to life across gaming, immersive audiobooks, podcasts, and interactive media. Direct every performance line by line with granular control over acting cues, pacing, dialect shifts, and backchanneling. Gemini 3.8 Flash-Lite TTS: Built for high-volume, cost-efficient scale. Optimized for high-volume dubbing, audio content creation, and expressive voice agents with fine-grained control over tone, pacing, and expressive nuance. 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 . Create and customize your own voices 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. Generative voice design: With Gemini 3.8 Flash TTS, create bespoke voices from scratch by customizing role, accent and voice characteristics across more than 100 languages and dialects using natural language prompting — whether you're bringing a dramatic, fire-breathing dragon to life or crafting a charismatic narrator with a distinct regional cadence. Expansive voice library: Access 2,000+ production-ready voices with broad language coverage — including regional varieties like Mexican Spanish, Quebec French, and Scots English. Voice replication: Recreate consistent vocal profiles from just a 30-second audio sample of your voice or a voice you have the rights to use, backed by built-in consent verification, SynthID watermarking, and C2PA credentials to protect both developers and their vocal talent. Save and scale: Save and manage the custom voices you designed to ensure consistent performance and minimal drift across ongoing projects. Voice remixing: Coming soon, pick a voice from our voice library and fine-tune timbre, pitch, pace, and accent. Use prompts to dial in characteristics (e.g. “add subtle Southern US accent” or “soften the delivery”). Direct the performance, line by line Once you've selected your voices, both TTS models give you precise control over how each line is delivered. Direct performance line by line: Write your own stage directions or let Gemini steer delivery with natural script cues — from a calm customer service agent to a whispered suspense scene. Long-form generation: Maintain high voice quality, natural pacing, and character timbre across hours of continuous audio with minimal speaker drift — ideal for podcasts and audiobooks. Native two-speaker scene staging: Direct multi-turn conversations seamlessly from a single script —whether for a podcast or dramatic storytelling—while keeping both voices distinctly separated with natural conversational turn-taking. Scripted vocal bursts & backchanneling: Add realistic conversational texture using non verbal cues (like <laughs>, <sigh>, <gasp> and active-listening interjections (like |mhm| or|yeah|) for precise comedic timing and reaction beats. Get expressive high-quality speech generation built for global scale 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. Build with trust, consent, and transparency 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 . Try our new Google AI Studio audio playground 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 1 , then bring them directly into a dual-speaker screenplay editor to direct line-by-line delivery. Try voice replication in Google AI Studio. Deploy high-performance voice interfaces with ease 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. Start using our latest Gemini Audio models: Gemini 3.8 Flash TTS is rolling out starting today: For developers : In the Gemini API and Google AI Studio For enterprises : Coming soon via API in Gemini Enterprise For everyone : In Gemini Notebook . Gemini 3.8 Flash-Lite TTS is rolling out starting today: For developers : In the Gemini API and Google AI Studio For enterprises : Coming soon via API in Gemini Enterprise For everyone : In Google Vids Get the latest news from Google in your inbox Sign up for our newsletters with product updates, event information, special offers, and more. Your information will be used in accordance with Google's privacy policy. You may opt out at any time.