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What is Inworld Realtime STT?

Inworld Realtime STT functions as a cutting-edge streaming API for speech-to-text that transcends mere transcription of spoken language. This advanced tool integrates low-latency speech recognition with the ability to profile voices, enabling analysis of emotions, vocal styles, accents, ages, and pitches derived from raw audio, which significantly enhances the expressiveness and responsiveness of subsequent LLMs and TTS systems. Developers can choose to stream audio in real-time, transcribe complete audio files, or extract voice profile signals through a unified API. The system is designed for real-time bidirectional streaming via WebSocket, provides synchronous transcription for full audio files, and offers unique voice profile signals for each audio segment, supporting various providers through a single model ID. Each audio segment generates a detailed profile of the speaker, accompanied by confidence scores that furnish LLMs with structured context to reflect the user's emotional state, such as indicating if they are feeling sad, frustrated, soft-spoken, high-pitched, or calm. This sophisticated capability fosters more nuanced interactions, significantly enriching user experiences by allowing responses to be tailored according to the emotional tone and vocal traits of the speaker. As a result, the technology not only improves communication but also creates a more engaging and personalized interaction for users.

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.

Media

Media

Integrations Supported

Grok
Grok Voice Agent
Grok Voice Agent Builder
Vercel AI Gateway

Integrations Supported

Grok
Grok Voice Agent
Grok Voice Agent Builder
Vercel AI Gateway

API Availability

Has API

API Availability

Has API

Pricing Information

Free
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

Inworld

Date Founded

2021

Company Location

United States

Company Website

inworld.ai/speech-to-text

Company Facts

Organization Name

SpaceXAI

Date Founded

2023

Company Location

United States

Company Website

docs.x.ai/developers/model-capabilities/audio/speech-to-speech

Categories and Features

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