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What is Modulate Velma?

Velma is a cutting-edge AI model developed by Modulate, operating within an extensive voice intelligence framework that interprets conversations directly from audio input instead of relying on text transcriptions. Unlike traditional approaches that convert spoken language into text for analysis by language models, Velma utilizes an Ensemble Listening Model (ELM) characterized by a distinctive architecture that can simultaneously process various dimensions of voice, including tone, emotion, pacing, intent, and behavioral signals. This sophisticated ability allows it to capture the full essence of a conversation, transcending mere words to recognize subtle cues such as stress, deceit, sarcasm, or escalation as they unfold. Velma accomplishes this feat by integrating numerous specialized detectors, each focused on particular aspects of speech, such as emotional context, inappropriate behaviors, or indications of synthetic voices, and then consolidating these signals to extract deeper insights regarding the conversational dynamics. As a result, it enables a more profound understanding of interactions in real time, significantly improving the potential for effective communication analysis and fostering better engagement. Its unique design positions Velma as a leader in the realm of voice intelligence, pushing the boundaries of how we perceive and interact with spoken language.

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

Five9
GENESYS
Grok
Grok Voice Agent
Grok Voice Agent Builder
Microsoft Teams
Slack
Vercel AI Gateway
Zendesk
Zoom

Integrations Supported

Five9
GENESYS
Grok
Grok Voice Agent
Grok Voice Agent Builder
Microsoft Teams
Slack
Vercel AI Gateway
Zendesk
Zoom

API Availability

Has API

API Availability

Has API

Pricing Information

$0.25 per hour
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

Modulate

Date Founded

2019

Company Location

United States

Company Website

www.modulate.ai/velma

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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