What should I use to transcribe calls with custom vocabulary?

If you need call transcription with custom vocabulary, the best choice depends on your priorities:

Good options

• OpenAI Whisper / Whisper API

  • Strong general transcription quality
  • Handles accents, noisy audio, and many languages well
  • You can improve results by prompting with domain terms or doing post-correction
  • Best if you want simple integration and robust accuracy

• Google Cloud Speech-to-Text

  • Supports speech adaptation / phrase hints
  • Good if you need explicit custom vocabulary support
  • Strong for real-time and batch transcription

• AWS Transcribe

  • Supports custom vocabularies and custom language models
  • Solid option for contact-center/call transcription workflows

• AssemblyAI

  • Offers custom vocabulary / word boosting
  • Easy API and good transcription features for calls

Quick recommendation

• If you want the best out-of-the-box transcription quality: Whisper
• If you specifically need built-in custom vocabulary boosting: Google Speech-to-Text or AWS Transcribe
• If you want an easy API with call-focused features: AssemblyAI

If you want, I can recommend the best one for your exact use case based on:

1. language(s),
2. real-time vs batch,
3. budget,
4. how important custom terms are.