AssemblyAI is one of the strongest speech-to-text APIs available. The $50 free credit provides a generous starting point, and the pay-as-you-go model makes it accessible. The LeMUR framework for running LLM prompts against transcripts is innovative. Audio intelligence features set it apart from simpler transcription services. Costs compound when stacking multiple features, and real-time streaming is limited to six languages.
AssemblyAI provides high-accuracy speech-to-text transcription APIs with speaker diarization, sentiment analysis, entity detection, and summarization across 40+ languages.