Hume Octave
LLM-based text-to-speech with acting instructions and emotion control.
About
Hume Octave is a speech-language model built for text-to-speech, pitched by Hume AI as the first LLM designed specifically for voice synthesis rather than a TTS bolt-on. It reads text with contextual awareness, adjusting tone, rhythm, and cadence to match meaning, and accepts natural-language acting instructions so a line can be delivered with sarcasm, urgency, or a whisper without retraining.
The original Octave launched in February 2025 with a prompt-based voice designer and a Creator Studio for long-form audio. Octave 2 followed in October 2025 as a multilingual second generation covering 11 languages with sub-200ms latency, multi-speaker conversation, and planned voice conversion and phoneme-level editing. Hume positions the model for audiobooks, virtual assistants, gaming, and voice agents.
What it can do
- Prompt-designed custom voices
- Acting instructions for emotional delivery
- Multilingual TTS (Octave 2, 11 languages)
- Multi-speaker conversation
- Creator Studio for long-form content
Setup
Sign up at hume.ai and use the Octave API or Creator Studio; SDKs and streaming WebSocket endpoints are documented.
Prerequisites
A Hume account and API key for programmatic use.
Use cases
Works with
Trust score — 8/10
Scored 8/10 (verified tier, metrics-v1). Evidence: Verified via vendor site/docs/GitHub and reputable coverage, wave 104; Trending score 82/100 from researcher assessment.
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.