Universal

Universal-2 is AssemblyAI's previous-generation speech-to-text model, still actively supported and a good choice for high-volume transcription where every cent counts. At $0.15/hr for pre-recorded audio, it's 40% cheaper than the newer Universal-3.5 Pro's $0.21/hr, while still delivering 93.32% word accuracy across 99 languages. The improvements over Universal-1 are real: 24% better on proper nouns, 15% on text formatting, and 21% on alphanumerics. For many use cases—contact centers, medical transcription, AI notetakers—this is plenty accurate. However, Universal-3.5 Pro now offers higher accuracy, native code-switching across 18 languages, and a context-aware real-time model (Universal-3.5 Pro Realtime at $0.45/hr). If your application handles multilingual conversations or needs the absolute lowest word error rate, the upgrade is worth it. Universal-2 also lacks the newer context carryover feature available in Universal-3.5 Pro Realtime. That said, Universal-2 supports 99 languages vs. 18 for Universal-3.5 Pro, so if broad language coverage is your priority, Universal-2 remains the better pick. In practice, Universal-2 is still a workhorse model—reliable, well-documented, and integrated with platforms like Zoom, LiveKit, and Pipecat. It's not the flashiest, but for budget-conscious teams processing millions of hours, it's a proven choice.