Audience
Developers and product teams that need fast, accurate streaming speech recognition and transcription for real-time voice applications
About Cartesia Ink 2
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.
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Cartesia Ink-Whisper
Cartesia Ink is a family of real-time streaming speech-to-text (STT) models designed to power fast, natural conversations in voice AI applications, acting as the “voice input” layer that converts spoken language into accurate text instantly. Its flagship model, Ink-Whisper, is specifically engineered for conversational environments, delivering ultra-low latency transcription with a time-to-complete-transcript as fast as 66 milliseconds, enabling fluid, human-like interactions without noticeable delays. Unlike traditional transcription systems built for batch processing, Ink is optimized for live dialogue, handling fragmented, variable-length audio through dynamic chunking, which reduces errors and improves responsiveness during pauses, interruptions, or rapid exchanges.
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Speechmatics
Best-in-Market Speech-to-Text & Voice AI for Enterprises.
Speechmatics delivers industry-leading Speech-to-Text and Voice AI for enterprises needing unrivaled accuracy, security, and flexibility. Our enterprise-grade APIs provide real-time and batch transcription with exceptional precision—across the widest range of languages, dialects, and accents.
Powered by Foundational Speech Technology, Speechmatics supports mission-critical voice applications in media, contact centers, finance, healthcare, and more. With on-prem, cloud, and hybrid deployment, businesses maintain full control over data security while unlocking voice insights.
Trusted by global leaders, Speechmatics is the top choice for best-in-class transcription and voice intelligence.
🔹 Unmatched Accuracy – Superior transcription across languages & accents
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🔹 Enterprise-Grade Security – Full data control
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Otter.ai
Otter is where conversations live. Generate rich notes for meetings, interviews, lectures, and other important voice conversations with Otter, your AI-powered assistant. Organizations who have the Otter advantage. Teams big and small trust Otter to transcribe their important conversations. Our shiny new release, Otter 2.0, adds more functionality to improve collaboration and productivity. The Teams plan includes capabilities designed especially for small and medium businesses and teams in larger enterprises. Record and review in real time. Search, play, edit, organize, and share your conversations from any device. Record conversations using Otter on your phone or web browser. Import or sync recordings from other services. Integrate with Zoom. Get real-time streaming transcripts and, within minutes, rich, searchable notes with text, audio, images, speaker ID, and key phrases. Share or export voice notes to inform others and get on the same page.
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Company Information
Cartesia
Founded: 2023
United States
docs.cartesia.ai/build-with-cartesia/stt/latest
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