{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/kyutai-tts-stt/","md":"https://postcutoff.com/m/kyutai-tts-stt/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":"kyutai-tts-stt","name":"Kyutai TTS 1.6B / Kyutai STT + Unmute","org":"Kyutai","family":"Delayed Streams Modeling","released":"2025-07-03","status":"current","type":"audio/speech","modality_in":["text","audio"],"modality_out":["audio","text"],"open_weights":true,"model_license":"cc-by-4.0","context_window":null,"max_output":null,"knowledge_cutoff":null,"pricing":null,"price_line":"Price not published","access":[{"provider":"Hugging Face (TTS)","model_id":"kyutai/tts-1.6b-en_fr","url":"https://huggingface.co/kyutai/tts-1.6b-en_fr"},{"provider":"Hugging Face (STT)","model_id":"kyutai/stt-2.6b-en","url":"https://huggingface.co/kyutai/stt-2.6b-en"},{"provider":"Hugging Face (STT)","model_id":"kyutai/stt-1b-en_fr","url":"https://huggingface.co/kyutai/stt-1b-en_fr"},{"provider":"GitHub (Unmute)","url":"https://github.com/kyutai-labs/unmute"}],"capabilities":[{"name":"Text-streaming TTS","detail":"Delayed-streams architecture (~1.8B params incl. 600M depth transformer) starts speaking before the full text is available, English + French; voices only via pre-computed embeddings (no raw cloning, by design).","first":false,"discovered":"launch","source":"https://huggingface.co/kyutai/tts-1.6b-en_fr"},{"name":"Streaming STT with semantic VAD","detail":"stt-2.6b-en (English, 2.5 s delay) and stt-1b-en_fr (0.5 s delay) transcribe as audio arrives; used in Unmute, which wraps any text LLM with real-time STT+TTS.","first":false,"discovered":"launch","source":"https://huggingface.co/kyutai/stt-2.6b-en"}],"entry":null,"notes":"STT open-sourced 2025-06-19, TTS + Unmute open-sourced 2025-07-03 (Kyutai blog). Weights CC-BY-4.0. For CPU TTS see kyutai-pocket-tts.","verified":"2026-09-29","body_md":"Sources: https://kyutai.org/blog/ , https://huggingface.co/kyutai/tts-1.6b-en_fr , https://huggingface.co/kyutai/stt-2.6b-en","page_url":"https://postcutoff.com/m/kyutai-tts-stt/","standing":{"kind":"speech and audio","newer_count":91,"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":{"id":"kyutai-moshi","name":"Kyutai Moshi / Hibiki-Zero (full-duplex speech models)","org":"Kyutai","released":"2024-09-17","page_url":"https://postcutoff.com/m/kyutai-moshi/"},"after":{"id":"kyutai-pocket-tts","name":"Kyutai Pocket TTS","org":"Kyutai","released":"2026-01-13","page_url":"https://postcutoff.com/m/kyutai-pocket-tts/"},"weights":"public","licence":"cc-by-4.0","licence_permissive":false,"summary":"Weights are public. Licence: CC BY 4.0. See the licence for commercial terms."}}