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Octave 2

It comprehends meaning and emotion, delivering unparalleled voice quality and expressiveness.
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Octave 2

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.

Technical Specifications

  • Supported Languages: English, Japanese, Korean, Spanish, French, Portuguese, Italian, German, Russian, Hindi, Arabic
  • Latency: 100 ms
  • Voice Cloning: Supported (requires ~15 seconds audio)
  • Audio Formats: MP3, WAV, PCM

Performance Benchmarks

  • 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

  • $0.078 per 1000 charatcers

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.

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.

Technical Specifications

  • Supported Languages: English, Japanese, Korean, Spanish, French, Portuguese, Italian, German, Russian, Hindi, Arabic
  • Latency: 100 ms
  • Voice Cloning: Supported (requires ~15 seconds audio)
  • Audio Formats: MP3, WAV, PCM

Performance Benchmarks

  • 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

  • $0.078 per 1000 charatcers

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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