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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 Cartesia Ink-Whisper?

Cartesia Ink offers a collection of advanced real-time streaming speech-to-text (STT) models that enable quick and fluid conversations in voice AI applications, acting as the vital "voice input" layer that accurately converts spoken language into text instantly. The standout model, Ink-Whisper, is designed specifically for conversational environments, achieving an impressive transcription latency of only 66 milliseconds, which promotes fluid, human-like exchanges without noticeable delays. Unlike traditional transcription systems that focus on batch processing, Ink is specifically engineered for real-time communication, skillfully handling fragmented and diverse audio using a pioneering dynamic chunking technique that reduces errors and boosts responsiveness, especially during pauses, interruptions, or rapid dialogues. As a result, this cutting-edge technology guarantees that users enjoy a more seamless and interactive experience, catering to the evolving requirements of contemporary communication. Furthermore, the ability of Ink to adapt to various speaking styles and environments makes it an invaluable tool in the realm of voice AI.

Media

Media

Integrations Supported

Grok
Grok Voice Agent
Grok Voice Agent Builder
Vercel AI Gateway

Integrations Supported

Vision Agents

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided

Pricing Information

$4 per month
Free Version
Free Trial Offered?

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub
Webinars
Online Training

Company Facts

Organization Name

SpaceXSI

Date Founded

2023

Company Location

United States

Company Website

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

Company Facts

Organization Name

Cartesia

Date Founded

2023

Company Location

United States

Company Website

cartesia.ai/ink

Categories and Features

AI Models

Not specified

AI Voice Agents

Not specified

AI Voice Models

Not specified

Categories and Features

AI Models

Not specified

AI Voice Models

Not specified

Speech to Text

Not specified

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