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features
design
support

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Description

Gemini 3.8 Flash TTS is a generative text-to-speech model from Google designed for expressive voice creation, character design, dialogue direction, and multilingual audio production. Instead of limiting users to fixed voice presets, the model can create entirely new vocal identities from natural-language descriptions. Developers and creators can specify attributes such as accent, role, timbre, speaking style, pacing, and other voice characteristics across more than 100 languages and dialects. The model also offers access to more than 2,000 production-ready voices and supports voice replication from a short authorized audio sample. Performance controls allow users to direct individual lines with stage directions, pacing instructions, dialect shifts, emotional cues, and conversational backchanneling. Gemini 3.8 Flash TTS supports long-form generation while maintaining voice consistency, making it suitable for podcasts, audiobooks, localization, and other extended audio projects. Native two-speaker scene support lets users create multi-turn conversations from a single script while preserving distinct voices and natural turn-taking. Google includes consent verification, SynthID watermarking, and C2PA credentials to provide greater transparency and safeguards around generated and replicated voices. Gemini 3.8 Flash TTS can be used through Google AI Studio and the Gemini API and is intended for developers, creators, enterprises, media companies, and teams building expressive speech experiences.

Description

Grok Voice 3.0 is an advanced speech-to-speech model that is accessible via the Grok Voice Agent API, designed for developers creating real-time voice applications. This model processes both audio and text inputs, delivering spoken audio or text outputs through a WebSocket connection while enabling features such as conversational turn-taking, interruptions, and function execution. Developers have the flexibility to link this model with custom functions and various server-side tools, which may include web searches, X searches, collections, or remote MCP servers. The API is crafted for use in interactive voice agents that enhance customer support and service call experiences, and it is also implemented for voice communication within Tesla vehicles and Grok Bot. Billing operates on a usage-based model, charging for audio by the minute and text input events separately. Additionally, the API documentation provides comprehensive setup instructions along with examples for clients using Python and JavaScript, ensuring that developers can easily integrate the functionality into their applications. This robust feature set empowers developers to create more engaging and efficient voice interaction systems.

API Access

Has API Yes 

API Access

Has API Yes 

Screenshots View All

Screenshots View All

Integrations

Gemini Yes 
Gemini 3.1 Flash-Lite Yes 
Gemini 3.1 Pro Yes 
Gemini Enterprise Yes 
Gemini Enterprise Agent Platform Yes 
Gemini Live API Yes 
Gemini Notebook Yes 
Google AI Studio Yes 
Google Vids Yes 
Grok No 
Grok Bot No 
Grok Voice Agent No 
Grok Voice Agent Builder No 
Model Context Protocol (MCP) No 
SynthID Yes 
Twilio No 

Integrations

Gemini No 
Gemini 3.1 Flash-Lite No 
Gemini 3.1 Pro No 
Gemini Enterprise No 
Gemini Enterprise Agent Platform No 
Gemini Live API No 
Gemini Notebook No 
Google AI Studio No 
Google Vids No 
Grok Yes 
Grok Bot Yes 
Grok Voice Agent Yes 
Grok Voice Agent Builder Yes 
Model Context Protocol (MCP) Yes 
SynthID No 
Twilio Yes 

Pricing Details

No price information available.
Free Trial No 
Free Version No 

Pricing Details

$0.08/min
Audio is $0.08 per minute. Text-only input events are $0.004 each. Server-VAD sessions are billed for the full session duration; push-to-talk sessions are billed for audio sent and received.
Free Trial Yes 
Free Version No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Vendor Details

Company Name

Google

Founded

1998

Country

United States

Website

google.com

Vendor Details

Company Name

SpaceXSI

Founded

2023

Country

United States

Website

x.ai/api/voice

Product Features

Text to Speech

API No 
Adjust Speaking Rate / Pitch No 
Audio Optimization No 
Custom Lexicons No 
Different Voice Choices No 
Multi-Language Support No 
Synchronize Speech No 

Product Features

Alternatives

Alternatives

No Alternatives