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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 Eleven v4?

Eleven v4 is a sophisticated text-to-speech system created by ElevenLabs, aimed at transforming written content into dynamic audio output. This innovative model supports multi-speaker dialogues, integrates emotional nuances and audio-event indicators, facilitates voice cloning, and ensures a stable speaker identity across different contexts. It caters to a diverse range of users, including content creators, publishers, and production teams, who can apply it for tasks such as narration, audiobooks, character dialogues, video game voiceovers, and multilingual initiatives. Developers can produce speech through either the ElevenLabs web application or API, while the Eleven v4 Turbo version is specifically designed for real-time speech applications and voice-agent uses. With support for over 90 languages, Eleven v4 provides a free plan that includes monthly credits for personal projects, in addition to paid subscriptions that offer higher credit allocations and advanced features. This adaptability positions it as an essential resource for those aiming to create top-notch audio content for various platforms, enhancing the overall experience for both creators and their audiences. As a result, Eleven v4 stands out as a leading choice in the ever-evolving field of audio production.

Media

Media

Integrations Supported

Grok
Grok Voice Agent
Grok Voice Agent Builder
Vercel AI Gateway

Integrations Supported

ElevenAgents
ElevenCreative
ElevenLabs

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided

Pricing Information

$0
Free plan: $0/month with 10,000 monthly credits for personal use. Paid plans start at $6/month with 30,000 monthly credits and a commercial license; Enterprise pricing is custom.
Free Version

Supported Platforms

SaaS

Supported Platforms

SaaS
iPhone
iPad

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

ElevenLabs

Date Founded

2022

Company Location

United Kingdom

Company Website

elevenlabs.io/v4

Categories and Features

AI Models

Not specified

AI Voice Agents

Not specified

AI Voice Models

Not specified

Categories and Features

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