{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/assemblyai-universal-3-5-pro/","md":"https://postcutoff.com/m/assemblyai-universal-3-5-pro/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"assemblyai-universal-3-5-pro","name":"AssemblyAI Universal-3.5 Pro (async)","org":"AssemblyAI","family":"Universal-3","released":"2026-07-07","status":"current","type":"audio/speech","modality_in":["audio","text"],"modality_out":["text"],"open_weights":false,"model_license":"proprietary","context_window":null,"max_output":null,"knowledge_cutoff":null,"pricing":{"per_hour":0.21,"unit":"per audio hour (pre-recorded); keyterms prompting +$0.05/hr, diarization +$0.02/hr, Medical Mode +$0.15/hr","source":"https://www.assemblyai.com/pricing"},"price_line":"$0.21 per hour","access":[{"provider":"AssemblyAI API","model_id":"universal-3-pro","endpoint":"https://api.assemblyai.com/v2/transcript","docs":"https://www.assemblyai.com/docs/getting-started/universal-3-5-pro"},{"provider":"OpenRouter","url":"https://openrouter.ai/assemblyai/universal-3-5-pro"},{"provider":"AssemblyAI Dictation API","model_id":"(Universal-3.5 Pro + LLM cleanup)","endpoint":"https://dictation.assemblyai.com/v1/transcribe/live","docs":"https://www.assemblyai.com/blog/dictation-api"}],"capabilities":[{"name":"Promptable speech language model","detail":"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.","first":false,"discovered":"launch","source":"https://www.assemblyai.com/blog/introducing-universal-3-pro"},{"name":"Dictation API (polished text from short utterances)","detail":"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'.","first":false,"discovered":"later","source":"https://www.assemblyai.com/blog/dictation-api"},{"name":"Medical Mode","detail":"`domain: medical-v1` for EN/ES/DE/FR clinical vocabulary; replaces deprecated Slam-1.","first":false,"discovered":"later","source":"https://www.assemblyai.com/llms/models.md"}],"entry":null,"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. 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).","verified":"2026-09-29","body_md":"Sources: https://www.assemblyai.com/llms/models.md , https://www.assemblyai.com/pricing","page_url":"https://postcutoff.com/m/assemblyai-universal-3-5-pro/","standing":{"kind":"speech and audio","newer_count":46,"newer":[{"id":"nemotron-3-5-transcribe","name":"NVIDIA Nemotron 3.5 Transcribe (30B-A4B)","org":"NVIDIA","released":"2026-10-28","page_url":"https://postcutoff.com/m/nemotron-3-5-transcribe/"},{"id":"hy-simulmt-30b-a3b","name":"Hy-SimulMT-30B-A3B","org":"Tencent","released":"2026-10-22","page_url":"https://postcutoff.com/m/hy-simulmt-30b-a3b/"},{"id":"eleven-realtime-v1-max","name":"Eleven Realtime v1 Max / Mini","org":"ElevenLabs","released":"2026-10-20","page_url":"https://postcutoff.com/m/eleven-realtime-v1-max/"},{"id":"voxtral-mini-transcribe-3","name":"Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3)","org":"Mistral AI","released":"2026-10-20","page_url":"https://postcutoff.com/m/voxtral-mini-transcribe-3/"},{"id":"voxtral-small-transcribe-3","name":"Voxtral Small Transcribe 3","org":"Mistral AI","released":"2026-10-20","page_url":"https://postcutoff.com/m/voxtral-small-transcribe-3/"}],"before":null,"after":{"id":"assemblyai-universal-3-6-pro-realtime","name":"AssemblyAI Universal-3.6 Pro Realtime","org":"AssemblyAI","released":"2026-09-29","page_url":"https://postcutoff.com/m/assemblyai-universal-3-6-pro-realtime/"},"weights":"closed","licence":"proprietary","licence_permissive":false,"summary":"Closed weights; access is hosted only."}}