Hume Octave TTS
LLM-based expressive TTS with voice design from text prompts. Hume is sunsetting its TTS and EVI APIs: access ends 2026-11-13 and account data is deleted afterwards.
Overview
Best for: Nothing new; existing users should migrate (e.g. to Inworld TTS-2 or ElevenLabs v4 for prompt-steered expressiveness).
At a glance
API shuts down 2026-11-13 and account data is deleted. Octave 2 (preview): ~100 ms model latency, 11 languages. Pricing not published.
Text plus optional acting description
MP3, WAV, PCM
Octave 2: English, Japanese, Korean, Spanish, French, Portuguese, Italian, German, Russian, Hindi, Arabic
Voice library, voice design, cloning from ~15 s audio
Vendor: Octave 2 ~100 ms model latency; instant mode first audio ~200 ms.
Not specified
N/A (sunsetting)
Features
- input streaming (/v0/tts/stream/input)
- voice design from text prompts
- voice cloning
- instant mode
Pricing
| What | Price | Unit |
|---|---|---|
| Pricing | Not published on hume.ai/pricing at time of research |
Not verifiable; API ends 2026-11-13
Free tier: Not verified
Source: hume.ai
Setup
- Do not start new integrations: access ends 2026-11-13.
- Existing users: export anything you need and migrate before that date.
Endpoint
wss://api.hume.ai/v0/tts/stream/input (path per docs; host not re-verified)Authentication
X-Hume-Api-Key header (not re-verified)
Warnings
API shutdown on 2026-11-13
Hume's docs state TTS and EVI access ends November 13, 2026 at 12:01 a.m. EST and account data is permanently deleted after that date. Migrate now.
Data deletion
Cloned and designed voices stored in your Hume account will be deleted; there is no indication they can be exported to another vendor.
Instant mode restrictions
Instant mode needs a predefined voice and num_generations of 1; voice design requests are slower.
Plus 12 warnings that apply to all text-to-speech, streaming APIs. See category warnings.
Limits
- 5,000 characters per utterance
- 1,000-character descriptions
- Up to 5 generations per request
Models and products
| Name | Status |
|---|---|
| Octave 1 | Sunsetting 2026-11-13 |
| Octave 2 (preview) | Sunsetting 2026-11-13 |
Docs and sources
Docs
Sources used
Pricing; exact WebSocket host/auth header.