Cartesia Ink 2

Cartesia Ink 2

Cartesia
Grok Voice 3.0

Grok Voice 3.0

SpaceXSI
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About

Ink 2 is Cartesia’s fastest, most accurate streaming speech-to-text model, built for production voice agents with the lowest word error rate and best turn detection of any streaming STT. It is designed to transcribe structured data such as phone numbers, dates, and emails correctly the first time, while also knowing when a speaker starts and finishes without requiring a separate voice activity detection system. Turn detection is built directly into the model, so voice agents can react to events instead of managing raw transcript segments. Ink 2 emits a full lifecycle of turn events, giving an agent clear signals for when to listen, interrupt, think, prepare a reply, cancel a premature response, or speak. The transcript property is cumulative within a turn, meaning each update contains the full text transcribed so far rather than a delta, and emitted text is final once sent.

About

Grok Voice 3.0 is a speech-to-speech model offered through the Grok Voice Agent API for developers building real-time voice applications. It accepts audio and text and returns spoken audio or text through a WebSocket session, supporting conversational turn-taking, interruptions, and function calling. Developers can connect the model to custom functions and server-side tools, including web search, X search, collections, and remote MCP servers. The API is intended for interactive voice agents such as customer-support and service-call experiences, and is also used for voice interactions in Tesla vehicles and Grok Bot. Billing is usage-based, with audio charged per minute and text input events billed separately. The API documentation includes setup instructions and examples for Python and JavaScript clients.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Developers and product teams that need fast, accurate streaming speech recognition and transcription for real-time voice applications

Audience

Developers building real-time voice applications, phone agents, interactive voice systems, and customer-support experiences.

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Pricing

$0.08/min
Audio is $0.08 per minute. Text-only input events are $0.004 each. Server-VAD sessions are billed for the full session duration; push-to-talk sessions are billed for audio sent and received.
Free Version Not Supported
Free Trial Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Cartesia
Founded: 2023
United States
docs.cartesia.ai/build-with-cartesia/stt/latest

Company Information

SpaceXSI
Founded: 2023
United States
x.ai/api/voice

Alternatives

Alternatives

Categories

AI Models Supported
AI Voice Models Supported
Speech to Text Supported

Categories

AI Voice Models Supported

Integrations

Grok Not Supported
Grok Bot Not Supported
Grok Voice Agent Not Supported
Grok Voice Agent Builder Not Supported
MachinesFluent Supported
Model Context Protocol (MCP) Not Supported
Twilio Not Supported

Integrations

Grok Supported
Grok Bot Supported
Grok Voice Agent Supported
Grok Voice Agent Builder Supported
MachinesFluent Not Supported
Model Context Protocol (MCP) Supported
Twilio Supported
Claim Cartesia Ink 2 and update features and information
Claim Cartesia Ink 2 and update features and information
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Claim Grok Voice 3.0 and update features and information