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What is Grok Voice Agent?

The Grok Voice Agent API is a high-performance voice platform that brings Grok’s conversational intelligence to developers. It is built on the same infrastructure that powers Grok Voice for millions of users worldwide. The API enables voice agents that can reason, speak naturally, and interact with tools in real time. Grok Voice Agents deliver extremely low latency, with responses generated in under one second. They rank number one on the Big Bench Audio benchmark for audio reasoning capabilities. The platform supports dozens of languages with accurate pronunciation and natural prosody. Agents automatically detect and respond in the user’s language or follow developer-defined language rules. Real-time web and X search can be combined with custom function calls. Multiple expressive voices are available for different use cases and industries. Developers can add auditory expressions such as whispers or laughter for realism. The API uses a simple flat-rate pricing model based on connection time. Grok Voice Agent API enables fast, scalable, and expressive voice-driven applications.

What is Grok 4.1 Fast?

Grok 4.1 Fast is xAI’s state-of-the-art tool-calling model built to meet the needs of modern enterprise agents that require long-context reasoning, fast inference, and reliable real-world performance. It supports an expansive 2-million-token context, allowing it to maintain coherence during extended conversations, research tasks, or multi-step workflows without losing accuracy. xAI trained the model using real-world simulated environments and broad tool exposure, resulting in extremely strong benchmark performance across telecom, customer support, and autonomy-driven evaluations. When integrated with the Agent Tools API, Grok can combine web search, X search, document retrieval, and code execution to produce final answers grounded in real-time data. The model automatically determines when to call tools, how to plan tasks, and which steps to execute, making it capable of acting as a fully autonomous agent. Its tool-calling precision has been validated through multiple independent evaluations, including the Berkeley Function Calling v4 benchmark. Long-horizon reinforcement learning allows it to maintain performance even across millions of tokens, which is a major improvement over previous generations. These strengths make Grok 4.1 Fast especially valuable for enterprises that rely on automation, knowledge retrieval, or multi-step reasoning. Its low operational cost and strong factual correctness give developers a practical way to deploy high-performance agents at scale. With robust documentation, free introductory access, and native integration with the X ecosystem, Grok 4.1 Fast enables a new class of powerful AI-driven applications.

Media

Media

Integrations Supported

Grok
C
C++
Clojure
Doraverse
EaseMate AI
Go
Grok Voice Think Fast 1.0
Grok Voice Think Fast 2.0
Java
Kotlin
Microsoft Foundry
Microsoft Foundry Models
OpenClaw
Python
R
Ruby
TypeScript
Visual Basic
Zo Computer

Integrations Supported

Grok
C
C++
Clojure
Doraverse
EaseMate AI
Go
Grok Voice Think Fast 1.0
Grok Voice Think Fast 2.0
Java
Kotlin
Microsoft Foundry
Microsoft Foundry Models
OpenClaw
Python
R
Ruby
TypeScript
Visual Basic
Zo Computer

API Availability

Has API

API Availability

Has API

Pricing Information

$0.05 per minute
$0.05 per minute of connection time
Free Version
Free Trial Offered?

Pricing Information

Pricing not provided
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

x.ai

Company Facts

Organization Name

SpaceXAI

Date Founded

2023

Company Location

United States

Company Website

grok.com

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