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AssemblyAI vs Whisper API: 2026 Comparison

AssemblyAI Whisper API
Overview Accurate speech-to-text API with built-in audio intelligence features like summarization, sentiment analysis, and topic detection. OpenAI's speech recognition API based on the Whisper model, offering accurate transcription and translation across 57 languages.
Pricing Pay-per-use ($-$$$) Pay-per-use ($)
Key Features
  • Speech-to-text
  • Speaker diarization
  • Summarization
  • Sentiment analysis
  • Topic detection
  • PII redaction
  • Real-time transcription
  • 57 languages
  • Transcription
  • Translation
  • Timestamp output
  • Multiple formats
Pros
  • High accuracy
  • Rich audio intelligence
  • Easy integration
  • Real-time support
  • High accuracy
  • Low cost
  • Many languages
  • Simple API
Cons
  • English-focused
  • Can be expensive
  • Limited language support
  • No real-time streaming
  • File size limits
  • No speaker diarization
  • No custom vocabulary

AssemblyAI

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Whisper API

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