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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 TTS?

Gemini 3.8 Flash TTS is Google’s advanced text-to-speech model for generating expressive, customizable, and multilingual synthetic speech. The model is designed for creative voice direction, allowing users to generate original characters and vocal personas using natural-language instructions instead of relying only on preset voices. Voice characteristics can be customized by role, accent, timbre, pacing, delivery style, and other attributes across more than 100 languages and dialects. Google also provides a library of more than 2,000 production-ready voices for projects that do not require a newly generated vocal identity. Voice replication can recreate a consistent vocal profile from a short reference sample when the user has permission to use the voice, with built-in consent verification requirements. Creators can direct performances line by line with stage directions and cues for emotion, timing, whispers, pauses, laughs, sighs, gasps, and conversational reactions. Long-form generation is designed to preserve voice quality, pacing, and character identity across extended content such as audiobooks, podcasts, and narrated media. Native two-speaker scene staging allows a single script to produce natural multi-turn dialogue with distinct speakers and controlled conversational timing. These capabilities make Gemini 3.8 Flash TTS applicable to gaming, interactive characters, voice agents, media localization, dubbing, branded voices, podcasts, audiobooks, and other audio-production workflows. Google applies SynthID watermarking to generated audio and supports C2PA credentials and consent checks to improve transparency and protect voice owners. Gemini 3.8 Flash TTS is available through Google AI Studio and the Gemini API, with additional integrations and deployments across Google products, enterprise applications, and third-party developer platforms.

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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