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features
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support

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Description

The Grok Voice Agent API allows developers to create advanced voice agents with industry-leading speed and intelligence. Built entirely in-house by xAI, the voice stack includes custom models for audio detection, tokenization, and speech generation. This deep control enables rapid performance improvements and ultra-low latency responses. Grok Voice Agents support dozens of languages with native-level fluency and can switch languages mid-conversation. The API consistently outperforms competing voice models in human evaluations for pronunciation and prosody. Real-time tool calling and live search across X and the web are supported. Developers can integrate custom tools to enable dynamic task execution. The API follows the OpenAI Realtime specification for easy adoption. Pricing is a flat per-minute rate, making costs predictable at scale. The Grok Voice Agent API is designed for production-ready voice applications.

Description

GPT-Realtime, OpenAI's latest and most sophisticated speech-to-speech model, is now available via the fully operational Realtime API. This model produces audio that is not only highly natural but also expressive, allowing users to finely adjust elements such as tone, speed, and accent. It is capable of understanding complex human audio cues, including laughter, can switch languages seamlessly in the middle of a conversation, and accurately interprets alphanumeric information such as phone numbers in various languages. With a notable enhancement in reasoning and instruction-following abilities, it has achieved impressive scores of 82.8% on the BigBench Audio benchmark and 30.5% on MultiChallenge. Additionally, it features improved function calling capabilities, demonstrating greater reliability, speed, and accuracy, with a score of 66.5% on ComplexFuncBench. The model also facilitates asynchronous tool invocation, ensuring that dialogues flow smoothly even during extended calls. Furthermore, the Realtime API introduces groundbreaking features like support for image input, integration with SIP phone networks, connections to remote MCP servers, and the ability to reuse conversation prompts effectively. These advancements make it an invaluable tool for enhancing communication technology.

API Access

Has API Yes 

API Access

Has API Yes 

Screenshots View All

Screenshots View All

Integrations

Azure Voice Live API No 
ChatGPT No 
GPT-Realtime-1.5 No 
GPT-Realtime-2 No 
GPT-Realtime-2.1 No 
GPT-Realtime-Translate No 
GPT‑Realtime‑Whisper No 
Grok Yes 
Grok Voice Think Fast 1.0 Yes 
Grok Voice Think Fast 2.0 Yes 
Microsoft Foundry Models No 
OpenAI No 
SmartCallz No 

Integrations

Azure Voice Live API Yes 
ChatGPT Yes 
GPT-Realtime-1.5 Yes 
GPT-Realtime-2 Yes 
GPT-Realtime-2.1 Yes 
GPT-Realtime-Translate Yes 
GPT‑Realtime‑Whisper Yes 
Grok No 
Grok Voice Think Fast 1.0 No 
Grok Voice Think Fast 2.0 No 
Microsoft Foundry Models Yes 
OpenAI Yes 
SmartCallz Yes 

Pricing Details

$0.05 per minute
$0.05 per minute of connection time
Free Trial No 
Free Version No 

Pricing Details

$20 per month
Free Trial No 
Free Version Yes 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Customer Support

Business Hours Yes 
Live Rep (24/7) No 
Online Support Yes 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person Yes 

Vendor Details

Company Name

SpaceXAI

Founded

2023

Country

United States

Website

x.ai

Vendor Details

Company Name

OpenAI

Founded

2015

Country

United States

Website

openai.com/index/introducing-gpt-realtime/

Product Features

Product Features

Alternatives

Alternatives