📖 The AI Tool Bible

AssemblyAI vs Whisper

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

 
AssemblyAI
Audio
Whisper
Audio
TaglineSpeech-to-text API with diarisation, summarisation, and topic detection.OpenAI's open-source speech-to-text — the de-facto baseline.
CategoryAudioAudio
PricingFreemium· Free credits; pay-per-use from $0.37/hrFree· Free open weights; $0.006/min via OpenAI API
ModelUniversal / Slam-1Whisper large-v3
Editorial score8.7 / 108.6 / 10
Use cases
transcriptiondiarisationpodcast indexing
transcriptionself-hostedmultilingual
Pros
  • High accuracy
  • Strong streaming API
  • Lots of post-processing features
  • Excellent SDKs and docs
  • Free, open weights
  • Multilingual (99 languages)
  • Strong baseline accuracy
  • Available via API or self-host
Cons
  • More expensive than Whisper for high volume
  • Latency varies
  • No diarisation built in
  • Hallucinations on silent segments
Websitewww.assemblyai.comopenai.com
Pick AssemblyAI if
  • ✅ High accuracy
  • ✅ Strong streaming API
  • ✅ Lots of post-processing features
  • ✅ Excellent SDKs and docs
Pick Whisper if
  • ✅ Free, open weights
  • ✅ Multilingual (99 languages)
  • ✅ Strong baseline accuracy
  • ✅ Available via API or self-host
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