{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2026-03-23-mistral-voxtral-tts/","md":"https://postcutoff.com/e/2026-03-23-mistral-voxtral-tts/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":"2026-03-23-mistral-voxtral-tts","date":"2026-03-23","date_precision":"day","short_title":"Mistral releases Voxtral TTS, an open-weight 4B text-to-speech model with 3-second voice cloning","deck":null,"takeaway":null,"category":"open-source","category_label":"Open source","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":[{"n":1,"title":"Mistral AI - Speaking of Voxtral","url":"https://mistral.ai/news/voxtral-tts","type":"official","group":"primary","domain":"mistral.ai"},{"n":2,"title":"Mistral docs - Voxtral TTS model card","url":"https://docs.mistral.ai/models/model-cards/voxtral-tts-26-03","type":"docs","group":"primary","domain":"docs.mistral.ai"},{"n":3,"title":"Hugging Face - Voxtral-4B-TTS-2603","url":"https://huggingface.co/mistralai/Voxtral-4B-TTS-2603","type":"code","group":"primary","domain":"huggingface.co"},{"n":4,"title":"Mistral AI - Voxtral Transcribe 2","url":"https://mistral.ai/news/voxtral-transcribe-2","type":"official","group":"primary","domain":"mistral.ai"},{"n":5,"title":"SiliconANGLE - Mistral releases an open-weights 'speaking' AI model","url":"https://siliconangle.com/2026/03/26/mistral-releases-open-weights-speaking-ai-model-voxtral-tts/","type":"press","group":"press","domain":"siliconangle.com"}],"official":4,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Mistral AI"],"title":"Mistral releases Voxtral TTS, an open-weight 4B text-to-speech model with 3-second voice cloning","summary":"On 2026-03-23 Mistral launched Voxtral TTS, its first text-to-speech model: a 4B-parameter model with open weights (CC BY-NC 4.0) that clones a voice from ~3 seconds of audio in 9 languages and, per Mistral, beats ElevenLabs Flash v2.5 in 68.4% of human preference tests, priced at $0.016 per 1K characters via API.","key_facts":["API id voxtral-tts-2603; HF weights mistralai/Voxtral-4B-TTS-2603 (CC BY-NC 4.0, non-commercial)","Architecture: 3.4B transformer decoder + 390M flow-matching acoustic transformer + 300M neural codec","9 languages: English, French, German, Spanish, Dutch, Portuguese, Italian, Hindi, Arabic","~70 ms model latency, ~9.7x real-time factor, up to 2 minutes of native audio","68.4% win rate vs ElevenLabs Flash v2.5 in multilingual voice-cloning preference tests (Mistral)","Price: $0.016 per 1K characters","Followed Voxtral Transcribe 2 (2026-02-04): Voxtral Mini Transcribe V2 ($0.003/min) and open Apache-2.0 Voxtral Realtime 4B"],"key_numbers":[],"tags":["mistral","voxtral","tts","speech","voice-cloning","open-weights"],"science":null,"body_md":"## What happened\n\nMistral added speech output to its Voxtral audio family. Voxtral TTS is served on the Mistral API\n(`/v1/audio/speech`), in Le Chat and Mistral Studio, and its weights were published on Hugging Face under a\nnon-commercial license. Six weeks earlier Mistral had shipped Voxtral Transcribe 2, including the open Apache-2.0\nVoxtral Realtime streaming ASR model (sub-200 ms latency).\n\n## Why it matters\n\nWith both open ASR and open TTS, Mistral became one of the few frontier labs offering a full open-weight voice stack,\ngiving European and self-hosting customers an alternative to ElevenLabs and OpenAI voices. Quality comparisons are\nMistral-reported.","disputed":[],"related":[],"people":[],"posts":[],"videos":[],"models":[{"id":"voxtral-tts","name":"Voxtral TTS","url":"https://postcutoff.com/m/voxtral-tts/"},{"id":"voxtral-transcribe-2","name":"Voxtral Transcribe 2 (Mini Transcribe V2 + Voxtral Realtime)","url":"https://postcutoff.com/m/voxtral-transcribe-2/"}],"changes":[{"date":"2026-09-29","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-09-29","run":null,"sources_read":null,"updated":"2026-09-29","human_review":null,"version":{"date":"2026-10-04"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":null,"in_training_data":true},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":null,"in_training_data":true},{"model_id":"gemini-4-hydrogen","name":"Gemini 4 Hydrogen","cutoff":"2026-03","days_after":null,"in_training_data":true},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":null,"in_training_data":true}],"short_url":null}