AssemblyAI Universal-3.6 Pro Realtime
Speech and audio
universal-3-6-pro
$0.45 per hour
AssemblyAI Universal-3.5 Pro (async)
Model iduniversal-3-pro
Price$0.21 per hour
Checked29 September 2026
Where it stands
46newer speech and audio models since its release
- NVIDIA Nemotron 3.5 Transcribe (30B-A4B)28 Oct 2026
- Hy-SimulMT-30B-A3B22 Oct 2026
- Eleven Realtime v1 Max / Mini20 Oct 2026
- Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3)20 Oct 2026
- Voxtral Small Transcribe 320 Oct 2026
The 5 newest are listed. All speech and audio models
- After it from AssemblyAI
- AssemblyAI Universal-3.6 Pro Realtime29 Sep 2026
- Weights
- Closed weights; access is hosted only.
How to call it
3 ways to use AssemblyAI Universal-3.5 Pro (async), with the model id each provider expects.
| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| AssemblyAI API | universal-3-pro |
https://api.assemblyai.com/v2/transcript |
assemblyai.com |
| OpenRouter | openrouter.ai | ||
| AssemblyAI Dictation API | (Universal-3.5 Pro + LLM cleanup) |
https://dictation.assemblyai.com/v1/transcribe/live |
assemblyai.com |
Pricing
| Per hour | $0.21 |
|---|
As published: “per audio hour (pre-recorded); keyterms prompting +$0.05/hr, diarization +$0.02/hr, Medical Mode +$0.15/hr”.
Source: assemblyai.com, checked 29 September 2026.
Specs
- Input
- Audio and text
- Output
- Text
- Context window
- Not published
- Max output
- Not published
- Open weights
- No
- Licence
- Proprietary
- Released
- 7 July 2026
- Status
- Current
- Type
- Speech and audio
What stands out
What its maker marketed at launch, and what people found later, each with its source.
Promptable speech language model
Universal-3 Pro (Feb 2026) introduced plain-language prompts controlling transcription (disfluencies, multilingual handling, PII, formatting); 3.5 Pro focuses on entities, rare words and domain terms with an LLM-based decoder.
Dictation API (polished text from short utterances)
Found after launch
Launched 2026-09-15: up to 5 s audio per request (chunked upload), removes fillers, resolves self-corrections and fixes name spellings via `llm_instruction`, `keyterms_prompt` and `stt_prompt`; 0.36 s average response, 3.87% WER on short-form audio (vendor-cited), 19 languages, $0.62/hour all-in. Open-source MIT macOS demo app ‘Blurt’.
Medical Mode
Found after launch
`domain: medical-v1` for EN/ES/DE/FR clinical vocabulary; replaces deprecated Slam-1.
Notes
API id stays universal-3-pro (pass in speech_models, plural; singular speech_model is deprecated). 18 languages; use universal-2 ($0.15/hr, 99+ languages) for broad coverage and legacy features (auto_chapters/summarization fail on 3.5 Pro). Added to OpenRouter 2026-09-22. Launch date 2026-07-07 from AssemblyAI releases collection via search (not opened directly). Streaming sibling: assemblyai-universal-3-6-pro-realtime.
Sources: https://www.assemblyai.com/llms/models.md , https://www.assemblyai.com/pricing
Not yet checked against an official source: Related AssemblyAI products: Voice Agent API (GA April 2026, $4.50/hr all-in) and LLM Gateway (OpenAI-compatible multi-provider LLM API that replaced LeMUR; migration guide at assemblyai.com/docs/llm-gateway/migration-from-lemur; exact rename date not verified).