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Keyterm prompting improves transcription accuracy for important terms and phrases by biasing the model toward transcribing them. It’s most useful for important or uncommon words and phrases, such as domain-specific terminology, brand or product names, and rare or invented words. Pass one or more terms with the keyterm query parameter when you open the WebSocket connection:
To pass multiple terms, repeat the keyterm parameter, one per term:
For a multi-word phrase, keep it in a single keyterm value and encode spaces as %20:
You can pass up to 100 keyterms per connection, up to a total of 1200 characters across all keyterms.
Keyterms apply for the entire connection and are set only when you open it. You cannot add or change keyterms mid-stream.
Keyterm prompting works on both the Realtime STT and Realtime STT (Auto) endpoints.

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Best practices

Consider the following to achieve the best results:
  • Use keyterms for important or uncommon words and phrases, such as domain-specific terminology, brand or product names, and rare or invented words
  • Avoid generic, common words like “the” or “and”
  • Avoid using too many keyterms and prioritize the ones that matter most
  • Use exact spelling and capitalization for each keyterm