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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 3.1 Flash TTS?

Gemini 3.1 Flash TTS showcases the latest innovations from Google in text-to-speech capabilities, focusing on delivering expressive, customizable, and scalable AI-driven speech solutions for developers and businesses. This technology is readily available through platforms such as Google AI Studio and Gemini Enterprise Agent Platform, placing a strong emphasis on user empowerment in audio creation, and allowing for the adjustment of delivery through natural language commands and an extensive set of over 200 audio tags that can manipulate aspects like pacing, tone, emotion, and style. It supports more than 70 languages, including various regional dialects, and offers a choice of 30 prebuilt voices, which enables the production of speech that can range from refined narrations to captivating conversational or artistic presentations. Developers can seamlessly embed specific guidance within their text inputs, which helps direct vocal expression while incorporating elements such as pacing, emotion, and pauses through a structured prompting mechanism that generates nuanced and high-quality audio output. This advanced functionality makes Gemini 3.1 Flash TTS particularly suited for practical implementations, encompassing applications in accessibility tools, gaming audio, and a wide array of other creative projects. Additionally, this versatility empowers users to tailor the technology effectively to satisfy the varying demands found across different sectors and industries.

Media

Media

Integrations Supported

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

Integrations Supported

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

API Availability

Has API

API Availability

Has API

Pricing Information

$25 per month
Free Trial Offered?
Free Version

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

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

blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-1-flash-tts/

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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