AssemblyAI Universal-3.6 Pro Realtime
Lineage: Universal-3 Pro Streaming (Mar 2026) -> Universal-3.5 Pro Realtime (2026-06-23) -> 3.6 (2026-09-29). Older streaming ids u3-rt-pro/u3-pro replaced. Voice Agent API ($4.50/hr all-in: STT+LLM+TTS) GA April 2026. AssemblyAI roadmap targets 30+ native languages for the next Universal-3.x in Q4 2026.
- Input
- audio, text
- Output
- text
- License
- proprietary
- Pricing
- per hour: $0.45 (per hour of streaming session (same as Universal-3.5 Pro Realtime); Universal-Streaming EN/multi $0.15/hr) source
- Verified
- 2026-09-29
How to call it
| Provider | Model id | Endpoint / URL | Docs |
|---|---|---|---|
| AssemblyAI API | universal-3-6-pro | wss://streaming.assemblyai.com/v3/ws?model=universal-3-6-pro | docs |
| AssemblyAI Voice Agent API | (default STT) | wss://agents.assemblyai.com/v1/ws | — |
Notable capabilities (1)
- Promptable streaming STT for voice agents: Prompting + keyterms together, real-time diarization, entity-aware endpointing and native code-switching in 32 languages with auto language detection; 5.13% normalized WER (vs 5.80% for 3.5 Pro Realtime), short-response WER 1.45%; median endpoint latency 537 ms. source
Sources: https://www.assemblyai.com/blog/universal-3-6-pro-realtime , https://www.assemblyai.com/llms/models.md , https://www.assemblyai.com/pricing