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Deepgram Keyterm Prompting Now Available for Voice AI Assistants

20, Apr 2026

Voice AI Assistants now support Deepgram Keyterm Prompting for Nova-3 and Flux STT models. Define up to 100 domain-specific terms and Deepgram prioritizes them during transcription, improving Keyword Recall Rate by up to 90%.

What's new

  • Keyterm Prompting support: Define domain-specific terms for Nova-3 and Flux at the assistant level, with no model retraining needed.
  • Up to 100 keyterms per request: Product names, acronyms, multi-word phrases, proper nouns, and industry-specific vocabulary.
  • Mono and multilingual coverage: Works with Nova-3 standard, Nova-3 multilingual, and Flux.
  • On-network processing: Keyterm matching runs inside Telnyx-hosted Deepgram models, keeping audio and inference on the same private backbone.
  • Mission Control configuration: Set keyterms directly in your Voice AI Assistant settings with no API call required.

Why it matters

  • Generic STT accuracy breaks down on specialized vocabulary. Brand names, SKUs, and clinical terms get misrecognized, breaking conversation flow and eroding caller trust.
  • Keyterm Prompting boosts Keyword Recall Rate up to 90%, so the terms that define your use case come through correctly on the first pass.
  • Capitalization and formatting from your keyterm list carry through to the transcript. Your output reflects your terminology, not a generic phonetic approximation.
  • No retraining, no custom models. Add a list of terms and get better accuracy immediately.

Example use cases

  • Healthcare voice agents that need to recognize drug names, procedure codes, and clinical terminology accurately.
  • Sales and support bots handling product catalogs where SKUs, model numbers, and brand names are critical.
  • Financial services assistants transcribing ticker symbols, fund names, and regulatory terms.
  • Logistics agents capturing shipper names, carrier codes, and location identifiers without errors.

Getting started

  1. Log in to Mission Control, go to AI, then Assistants, and select your assistant.
  2. Open the Voice tab and scroll down to Transcription.
  3. Select Nova-3 or Flux as your STT model.
  4. Enter your terms in the Keyterm Boost field.
  5. Test a live call and confirm your target terms appear correctly in the transcript.

Learn more in the Deepgram Keyterm Prompting docs or the Telnyx AI Assistants documentation.