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What is Realtime TTS-2?

Inworld AI's Realtime TTS-2 is an advanced voice generation model crafted for real-time conversation, striving to deliver a dialogue experience that closely resembles human interaction. This groundbreaking system captures every facet of a conversation, assessing the user's tone, rhythm, and emotional subtleties, while enabling developers to direct voice output through straightforward English commands, akin to directing an AI. Unlike conventional speech synthesis that functions independently, this model contextualizes previous conversations, ensuring that tone and pacing adapt dynamically, meaning that a response can evoke varied reactions based on prior context, such as humor or melancholy. Moreover, the Voice Direction feature allows developers to influence speech delivery in a way similar to a director guiding an actor, utilizing natural language instead of fixed emotion settings or sliders. Developers can also include inline nonverbal indicators like [sigh], [breathe], and [laugh] directly in the text, which the model effortlessly converts into appropriate audio responses. Importantly, Realtime TTS-2 preserves a cohesive voice identity across more than 100 languages, facilitating seamless language shifts within a single interaction, which significantly boosts its utility in various multilingual environments. As a result, this capability not only enhances the authenticity of conversations but also plays a crucial role in narrowing the divide between human communicative nuances and machine responses. The advancements of Realtime TTS-2 make it a remarkable tool in the evolution of interactive voice technology.

What is Gemini 3.8 Flash-Lite TTS?

Gemini 3.8 Flash-Lite TTS is Google’s efficiency-focused text-to-speech model for generating expressive audio at high volume. It is positioned for applications where scalability and cost efficiency are important, including dubbing, localization, automated content production, and conversational voice systems. The model gives users detailed control over speech characteristics such as tone, pacing, delivery, and expressive nuance. Creators and developers can direct individual lines using script instructions to produce performances ranging from straightforward narration to more expressive dialogue. Long-form generation is designed to maintain natural pacing, audio quality, and stable speaker characteristics over extended recordings such as podcasts and other continuous content. Gemini 3.8 Flash-Lite TTS also supports native two-speaker scene staging, allowing a single script to generate structured conversations with distinct speakers and natural turn-taking. Nonverbal performance cues including laughs, sighs, gasps, and conversational backchanneling can be incorporated to add realistic texture to generated speech. With support for more than 100 languages, the model can be used to create multilingual audio experiences and localized content for audiences across different regions. Google reports that Gemini 3.8 Flash-Lite TTS performs strongly in human preference evaluations across languages including Japanese, Brazilian Portuguese, Vietnamese, Modern Standard Arabic, Mexican Spanish, and Hindi. Generated audio from Gemini Audio models includes SynthID watermarking, providing an imperceptible signal that can help identify AI-generated speech. Gemini 3.8 Flash-Lite TTS is available through Google AI Studio and the Gemini API, is integrated into Google Vids, and is planned for enterprise API access through Gemini Enterprise.

Media

Media

Integrations Supported

Gemini
ChatGPT
Claude
Gemini 3.1 Flash-Lite
Gemini 3.1 Pro
Gemini 3.5 Pro
Gemini Enterprise
Gemini Enterprise Agent Platform
Gemini Live API
Gemini Notebook
Google AI Studio
Google Vids
Grok
Perplexity
SynthID

Integrations Supported

Gemini
ChatGPT
Claude
Gemini 3.1 Flash-Lite
Gemini 3.1 Pro
Gemini 3.5 Pro
Gemini Enterprise
Gemini Enterprise Agent Platform
Gemini Live API
Gemini Notebook
Google AI Studio
Google Vids
Grok
Perplexity
SynthID

API Availability

Has API

API Availability

Has API

Pricing Information

$25 per month
Free Version
Free Trial Offered?

Pricing Information

Pricing not provided
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Inworld

Date Founded

2021

Company Location

United States

Company Website

inworld.ai/blog/realtime-tts-2

Company Facts

Organization Name

Google

Date Founded

1998

Company Location

United States

Company Website

google.com

Categories and Features

Text to Speech

API
Adjust Speaking Rate / Pitch
Audio Optimization
Custom Lexicons
Different Voice Choices
Multi-Language Support
Synchronize Speech

Categories and Features

Text to Speech

API
Adjust Speaking Rate / Pitch
Audio Optimization
Custom Lexicons
Different Voice Choices
Multi-Language Support
Synchronize Speech

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