Cheapest Audio Transcription APIs in 2025: Whisper via API vs AssemblyAI vs Deepgram

Cheapest Audio Transcription APIs in 2025: Whisper via API vs AssemblyAI vs Deepgram Audio transcription has become a commodity — Whisper changed everything. But running Whisper locally requires a GPU (or at least a beefy CPU), and hosting it yourself adds ops overhead. The better path for most developers: use a transcription API. This guide compares the leading audio transcription APIs by price, accuracy, language support, and developer experience. What to Consider When Choosing a Transcription API Price: Charged per minute of audio, per hour, or per request. Volume discounts matter. Accuracy: Varies by language, audio quality, and domain (medical, legal, technical). Languages: Whisper supports 99+ languages; some services only optimize for English. Speaker diarization: Can it distinguish who's speaking? Turnaround time: Real-time streaming vs async batch processing. Word-level timestamps: Needed for video subtitles and caption generation. Comparison Table Tool Price Languages Diariza