{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/grok-tts/","md":"https://postcutoff.com/m/grok-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":"grok-tts","name":"Grok Text to Speech (Grok TTS API)","org":"xAI","family":"Grok Voice","released":"2026-04-17","status":"current","type":"audio/speech","modality_in":["text"],"modality_out":["audio"],"open_weights":false,"model_license":"proprietary","context_window":null,"max_output":null,"knowledge_cutoff":null,"pricing":{"per_million_characters":15,"unit":"USD per 1M characters","source":"https://docs.x.ai/developers/pricing"},"price_line":"$15 per 1M characters","access":[{"provider":"xAI API (REST)","endpoint":"https://api.x.ai/v1/tts","docs":"https://docs.x.ai/developers/model-capabilities/audio/text-to-speech"},{"provider":"xAI API (WebSocket streaming)","endpoint":"wss://api.x.ai/v1/tts","docs":"https://docs.x.ai/developers/model-capabilities/audio/text-to-speech"}],"capabilities":[{"name":"Inline speech tags","detail":"Inline tags ([pause], [laugh], [sigh], [cry], [gasp], ...) and wrapping tags (<whisper>, <soft>, <loud>, <slow>, <fast>, <sing>) control delivery.","first":false,"discovered":"launch","source":"https://docs.x.ai/developers/model-capabilities/audio/text-to-speech"},{"name":"Custom (cloned) voices","detail":"Clone a voice from a short reference clip via the Custom Voices API; the voice_id works like built-in voices in TTS and the Voice Agent API.","first":false,"discovered":"later","source":"https://docs.x.ai/developers/model-capabilities/audio/text-to-speech"}],"entry":null,"notes":"Launched with the Grok STT API on 2026-04-17 (some press reports an earlier developer opening in March 2026). No separate model id is documented; the endpoint selects the model. 60,000 characters per REST request; ~20 languages plus auto-detect; MP3/WAV/PCM/mu-law/A-law at 8-48 kHz; voice list via GET /v1/tts/voices (Ara, Eve, Leo, Rex, Sal and many more).","verified":"2026-09-29","body_md":"Call `POST https://api.x.ai/v1/tts` with your text and a `voice` (see the docs for the exact request schema).\n\nSources: https://docs.x.ai/developers/model-capabilities/audio/text-to-speech · https://x.ai/news/grok-stt-and-tts-apis · https://docs.x.ai/developers/pricing","page_url":"https://postcutoff.com/m/grok-tts/","standing":{"kind":"speech and audio","newer_count":60,"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":"grok-voice-think-fast-2-0","name":"Grok Voice Think Fast 2.0","org":"xAI","released":"2026-07-29","page_url":"https://postcutoff.com/m/grok-voice-think-fast-2-0/"},"weights":"closed","licence":"proprietary","licence_permissive":false,"summary":"Closed weights; access is hosted only."}}