Universal-3.5 Pro - The most accurate STT model from AssemblyAI.
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Universal-3.5 Pro is AssemblyAI's most accurate speech-to-text model, now available at our Realtime & Async endpoints. It transcribes every conversation exactly as it's heard—code-switching across 18 languages, our most accurate speaker diarization yet, and contextual prompting to steer results.
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the joint diarization + ASR pass is the real differentiator here, most of the transcription-quality complaints I've seen elsewhere are actually speaker-attribution bugs wearing a transcription-accuracy costume. curious what happens at the edge of the 18-language list though: if someone code-switches into a language that's not in that set, does it degrade gracefully and flag low confidence, or does it just force-fit the nearest supported language and hand you a clean-looking transcript that's quietly wrong