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What is Grok Voice Think Fast 2.0?

Grok Voice Think Fast 2.0 is xAI’s flagship voice model for creating real-time AI assistants, phone agents, and interactive voice applications. The model is designed to stream both audio and text bidirectionally over WebSocket for low-friction conversational experiences. Developers can use it to build systems that listen, respond, reason, and adapt during live voice interactions. Grok Voice Think Fast 2.0 supports configurable system instructions so teams can shape behavior, persona, policies, and task handling. It also allows developers to choose high reasoning effort or no reasoning effort depending on latency, cost, and complexity requirements. The model supports built-in voices, custom voices, playback speed controls, automatic server-side voice activity detection, silence duration settings, idle re-engagement, and session resumption after temporary disconnects. It accepts PCM, G.711 μ-law, G.711 A-law, and Opus audio through JSON frames or raw binary frames. Configurable PCM sample rates let teams support use cases ranging from telephone-quality voice calls to 48 kHz audio workflows. Grok Voice Think Fast 2.0 supports more than 20 languages with native-quality accents, automatic language detection, natural responses in the speaker’s language, and seamless code-switching. Developers can provide language hints and up to 100 key terms to improve recognition of regional speech, names, products, codes, addresses, and specialized terminology. By combining real-time audio streaming, configurable reasoning, voice controls, multilingual support, transcription tuning, and pronunciation replacement, Grok Voice Think Fast 2.0 gives developers a flexible foundation for advanced voice AI products.

What is Fish Audio?

Fish Audio offers innovative AI-based solutions for text-to-speech (TTS), voice replication, and speech recognition (STT). Targeting businesses and developers, this platform enables the integration of realistic voice generation into their applications. Users can effortlessly replicate specific voices thanks to its advanced voice cloning features, while the generative AI produces expressive and natural speech in multiple languages. Additionally, Fish Audio provides an API that ensures easy integration and includes features like voice activity detection for improved performance. This flexibility positions Fish Audio as a crucial asset across various industries, such as content creation, virtual assistant programming, and enhancements in customer service, allowing users to connect with their audiences in meaningful ways. In essence, it serves as a holistic solution for those looking to advance their audio-related initiatives with cutting-edge technology. Ultimately, Fish Audio empowers users to create more immersive and engaging audio experiences.

Media

Media

Integrations Supported

Grok
Grok Voice Agent
Grok Voice Agent Builder
Vercel AI Gateway
Vision Agents
VoiSpark

Integrations Supported

Grok
Grok Voice Agent
Grok Voice Agent Builder
Vercel AI Gateway
Vision Agents
VoiSpark

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided
Free Version
Free Trial Offered?

Pricing Information

Free
Premium: $6.66/month (billed annually), $9.99/month (billed monthly)
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

SpaceXAI

Date Founded

2023

Company Location

United States

Company Website

docs.x.ai/developers/model-capabilities/audio/speech-to-speech

Company Facts

Organization Name

Hanabi AI

Date Founded

2024

Company Location

United States

Company Website

fish.audio/

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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