Octave TTS redefines speech synthesis by leveraging LLM intelligence.
Octave 2 API Overview
Octave 2 is the next-generation multilingual text-to-speech system, powered by large language model (LLM) intelligence. It understands text emotionally and semantically to generate expressive, human-like speech in real time. This system is designed to deliver industry-leading voice quality with ultra-low latency and broad language support, enabling versatile use cases from conversational AI to audiobooks.
Octave 2 delivers 40% faster audio generation than Octave 1, with typical latencies under 200 milliseconds.
In blind auditory tests involving 180 human raters comparing Octave to ElevenLabs Voice Design, Octave was preferred for audio quality (71.6%), naturalness (51.7%), and matching voice descriptions (57.7%).
The model reliably handles emotional shifts and complex speech patterns, improving overall naturalness and expressiveness.
Key Features
LLM-powered Emotional Understanding: Unlike traditional TTS, Octave 2 interprets the meaning and emotional intent behind text, modulating pitch, tempo, and emphasis to match context.
Ultra-low Latency: Real-time speech synthesis with model latency as low as ~100 milliseconds, ideal for interactive and conversational applications.
Multilingual Support: Fluent synthesis in 11 languages including English, Japanese, Korean, Spanish, French, Portuguese, Italian, German, Russian, Hindi, and Arabic.
Long-Form Versatility: Maintains emotional consistency across extended content such as audiobooks and podcasts, adapting seamlessly to changes in character emotions or scenes.
Advanced Features: Voice conversion, direct phoneme editing, and reliable pronunciation of uncommon or repeated words, numbers, and symbols.
Octave 2 API Pricing
$0.063 per 1000 charatcers
Use Cases
Conversational AI and Interactive Agents: Real-time, emotionally aware speech for chatbots, virtual assistants, and customer service.
Audiobooks and Podcasts: Long-form narration with consistent emotional tone and character voice adaptation.
Voice Cloning and Custom Voices: Personalized voice creation for branding, media production, and accessibility.
Gaming and Animation: Dynamic character dialogue with nuanced emotional expression.
Telephony and IVR Systems: Fast, natural-sounding prompts and responses for automated phone systems.
Accessibility Tools: Enhanced screen readers and speech aids with emotional and contextual speech understanding.
Code Sample
Comparison with Other Models
vs ElevenLabs: Octave 2 uses LLM intelligence to deeply understand and express the emotional and semantic context of text, producing nuanced speech with real-time latency around 100ms. ElevenLabs offers highly natural and expressive voices with real-time streaming but lacks the advanced semantic understanding and broader multilingual support found in Octave 2.
vs OpenAI TTS: OpenAI's TTS focuses on clarity, prosody control, and interactive real-time streaming, enabling flexible speaking styles via prompts. Octave 2 expands on this by integrating emotional intent recognition at a semantic level, leading to more human-like expressiveness.
vs Mozilla TTS: Mozilla TTS is highly customizable and favored in research for building custom voices but is often less performant in real-time responsiveness and emotional expressiveness. Octave 2, as a commercial-grade LLM-based system, delivers superior voice quality, faster synthesis, and more natural emotional modulation out of the box.
vs Chatterbox: Chatterbox is optimized for low-latency dialogue and configurable expressiveness with efficient voice cloning at a smaller model scale. Octave 2 surpasses Chatterbox in semantic understanding and emotional depth, offering a richer real-time voice experience with longer-form consistency and multilingual capabilities.
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