{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/hume-octave-2/","md":"https://postcutoff.com/m/hume-octave-2/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":"hume-octave-2","name":"Hume Octave 2 (TTS)","org":"Hume AI","family":"Octave","released":"2025-10-01","status":"current","type":"audio/speech","modality_in":["text","audio"],"modality_out":["audio"],"open_weights":false,"model_license":"proprietary","context_window":null,"max_output":null,"knowledge_cutoff":null,"pricing":{"per_1k_characters":0.15,"unit":"per 1K characters overage on Free/Starter/Creator plans; $0.12 Pro, $0.10 Scale, $0.05 Business (plans include monthly character quotas)","source":"https://www.hume.ai/pricing"},"price_line":"$0.15 per 1K characters","access":[{"provider":"Hume API","model_id":"version: 2","endpoint":"https://api.hume.ai/v0/tts","docs":"https://dev.hume.ai/docs/text-to-speech-tts/overview"},{"provider":"Web app","url":"https://platform.hume.ai"}],"capabilities":[{"name":"LLM-based emotionally intelligent TTS","detail":"Speech-language model that infers emotion and delivery from text; natural-language 'acting instructions' steer tone. Octave 2 at half the price of Octave 1, ~100 ms model latency (docs) / under 200 ms (launch blog).","first":false,"discovered":"launch","source":"https://www.hume.ai/blog/octave-2-launch"},{"name":"11 languages, instant cloning from 15 s","detail":"Arabic, English, French, German, Hindi, Italian, Japanese, Korean, Portuguese, Russian, Spanish; instant voice cloning from a ~15 s recording with accent prediction across languages; voice design from a text prompt (English only).","first":false,"discovered":"launch","source":"https://dev.hume.ai/docs/text-to-speech-tts/overview"},{"name":"Voice conversion and phoneme editing","detail":"Launch post describes voice conversion (swap speaker) and direct phoneme-level pronunciation editing as new capabilities for a speech-language model.","first":false,"discovered":"launch","source":"https://www.hume.ai/blog/octave-2-launch"}],"entry":null,"notes":"Select via `version: 2` in the TTS request body (`1` = Octave 1, English/Spanish, ~200 ms). Docs still label Octave 2 '(preview)' as of 2026-09-29. Auth header X-Hume-Api-Key. Max 5,000 chars per utterance, 1,000-char descriptions. Formats MP3/WAV/PCM. No Octave 3 announced on Hume's blog through Sept 2026. Speech-to-speech sibling: see hume-evi.","verified":"2026-09-29","body_md":"Emotionally expressive TTS from Hume AI (Octave = \"Omni-capable text and voice engine\").\n\n```bash\ncurl https://api.hume.ai/v0/tts -H \"X-Hume-Api-Key: $HUME_API_KEY\" -H \"Content-Type: application/json\" \\\n  -d '{\"version\":2,\"utterances\":[{\"text\":\"I cannot believe it worked!\",\"description\":\"a delighted, breathless scientist\"}]}'\n```\n\nSources: https://dev.hume.ai/reference/text-to-speech-tts/synthesize-json , https://www.hume.ai/pricing , https://www.hume.ai/blog/octave-2-launch","page_url":"https://postcutoff.com/m/hume-octave-2/","standing":{"kind":"speech and audio","newer_count":84,"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":"hume-evi","name":"Hume EVI 3 / EVI 4 mini (speech-to-speech)","org":"Hume AI","released":"2025-05-29","page_url":"https://postcutoff.com/m/hume-evi/"},"after":null,"weights":"closed","licence":"proprietary","licence_permissive":false,"summary":"Closed weights; access is hosted only."}}