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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 Dessa?

Dessa is a groundbreaking speech-to-speech AI model crafted by Block, tailored for investigating voice technology in conversations and its diverse uses. This model stands out by processing audio inputs to produce audio outputs directly, eliminating the need for converting to text first. Rather than depending on written language, it is constructed from actual human dialogues, allowing it to engage in full-duplex communication, where listening and speaking occur at the same time. It is designed to function locally on high-performance hardware, such as the MacBook Pro with an M4 Max chip or better, effectively capturing subtle nuances in conversation, including emotions, sarcasm, laughter, pauses, and the flow of dialogue, which are often lost in traditional text-based systems. Primarily targeted at AI safety researchers and developers, Dessa serves as an invaluable resource for investigating the dynamics of voice models, privacy considerations, and the complexities of real-time communication. Notably, Dessa is not meant for general commercial applications or as a hosted voice-agent solution, highlighting its exclusive focus on research and development within the voice technology sector. This intentional design emphasizes its capacity to enhance the comprehension of voice interactions, paving the way for future advancements in artificial intelligence. Furthermore, by concentrating on these aspects, Dessa contributes to a deeper dialogue about the implications of voice technology in society.

Media

Media

Integrations Supported

Grok
Grok Voice Agent
Grok Voice Agent Builder
Vercel AI Gateway

Integrations Supported

API Availability

Has API

API Availability

Pricing Information

Pricing not provided

Pricing Information

Pricing not provided

Supported Platforms

SaaS

Supported Platforms

Mac

Customer Service / Support

Web-Based Support

Customer Service / Support

Not specified

Training Options

Documentation Hub

Training Options

Not specified

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

Block

Date Founded

2009

Company Location

United States

Company Website

block.xyz/dessa

Categories and Features

AI Models

Not specified

AI Voice Agents

Not specified

AI Voice Models

Not specified

Categories and Features

AI Voice Models

Not specified

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SpaceXSI