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Octave 2
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Octave 2 is a closed-weights text-to-speech model from Hume AI, released October 2025. Licence: proprietary.
$ how it compares
Scored text-to-speech models released closest to Octave 2, out of 148 with a score, then more from Hume AI.
| # | model | score | where | ||
|---|---|---|---|---|---|
| 1 |  Seed TTS 2.0 Standard | 84±5 | comparison only | ||
| 26 |  VoxCPM 0.5B | 64±1 | local | ||
| 32 |  IndexTTS-2 | 63±1 | local | ||
| 57 |  Sonic 3 | 58±2 | api $65.00/M chars | ||
| 122 |  NeuTTS Air | 36±10 | local | ||
| more from Hume AI | |||||
| 56 | Octave TTS (Octave 1) | 58±4 | api $50.00/M chars | ||
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$ where to run it
Through an API
api · $25.00/M chars · www.hume.ai ↗ · price sourceUSD per 1M characters: Hume lists Octave 2 additional-character usage at $0.025 per 1,000 characters on the Business plan ($500/month; lowest published self-serve rate); Creator $0.075, Pro $0.06, Scale $0.05 per 1,000 on lower plans (x1000). Product: Octave text-to-speech API. API model: Octave 2. Settings: Business-plan usage-based overage. Price basis: published list rate, per-1K to per-1M scaling only. Exclusions: monthly plan fee, included characters, EVI. Currency: USD. Hume official pricing page, observed 2026-09-25.
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data updated · sources and licences · json