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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 GPT-Live-1.1?

OpenAI's GPT-Live-1.1 is a sophisticated full-duplex voice model tailored for instantaneous interactions in ChatGPT Voice. It effectively listens and speaks continuously, which means it can handle interruptions, pauses, and different speaking rates without waiting for a clear endpoint. Within the ChatGPT platform, users can engage in fluid conversations that blend voice, text, and images while also leveraging web searches, memory functionalities, and interconnected applications, all depending on their specific account, plan, and workspace setup. This feature can be accessed through the ChatGPT website and compatible mobile applications, with availability and usage limitations dictated by the selected subscription plan. The model is designed for both individuals and organizations that require vocal assistance for inquiries, idea generation, information gathering, and routine tasks. GPT-Live-1.1 marks a significant upgrade from its predecessor, GPT-Live-1, reflecting OpenAI's dedication to enhancing user interaction and engagement. This development not only showcases technological progress but also highlights the importance of improving conversational experiences for users across various contexts. The continuous evolution of such voice models underscores a broader trend towards integrating more natural communication methods in digital platforms.

Media

Media

Integrations Supported

Grok
Grok Voice Agent
Grok Voice Agent Builder
Vercel AI Gateway

Integrations Supported

ChatGPT
ChatGPT Work
OpenAI
OpenAI Codex
OpenAI Dots

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided

Pricing Information

$20/user/month
GPT-Live-1.1 access is included with ChatGPT Plus at $20 per user per month, billed monthly, with 3 hours of Live use per rolling 24-hour period. Higher-tier plans provide larger allowances; business and workspace terms vary by plan.

Supported Platforms

SaaS

Supported Platforms

SaaS
Android
iPhone

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

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

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com

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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