AssemblyAI (YC S17) is currently the one that stands out in the WER and accuracy benchmarks (https://www.assemblyai.com/benchmarks https://www.assemblyai.com/be

AssemblyAI (YC S17) is currently the one that stands out in the WER and accuracy benchmarks (https://www.assemblyai.com/benchmarks https://www.assemblyai.com/benchmarks). Though its models are accessed through a web API rather than locally hosted, and speaker diarization is enabled through a parameter in the API call (https://www.assemblyai.com/docs/speech-to-text/pre-recorded-audio/speaker-diarization https://www.assemblyai.com/docs/speech-to-text/pre-recorded-...).