About OpenAudio S1: Redefining the Future of AI Voice

Welcome to OpenAudio, the pioneering force behind the latest generation of advanced Text-to-Speech (TTS) models. Originally founded as Fish-Speech, the project has rebranded to OpenAudio to signify a commitment to pushing the boundaries of AI voice technology. The flagship product, OpenAudio S1, represents a monumental leap forward, claiming to achieve the expressiveness and naturalness of professional voice actors.

Vision: Unprecedented Naturalness and Control

The mission of OpenAudio is to redefine the AI voice generation experience. OpenAudio S1 is built upon advanced architectural design and massive-scale training data, leading to unprecedented levels of speech naturalness and expressiveness. The voices generated by OpenAudio S1 are so smooth and realistic that they are almost indistinguishable from human voiceovers, making them ideal for professional scenarios such as video dubbing, podcasts, and game character voices.

Setting New Benchmarks in Voice Synthesis

• Achieved the #1 ranking on TTS-Arena and TTS-Arena2.
• Boasts an industry-leading English Word Error Rate (WER) as low as 0.008.
• Exhibits a Character Error Rate (CER) of only 0.004 in Seed TTS assessment.
• These performance metrics significantly surpass traditional models, proving OpenAudio S1's leading position in speech accuracy.
• User feedback consistently highlights OpenAudio S1's superior voice realism and emotional delicacy compared to competitors like ElevenLabs.

Innovative Features for Unmatched Expressiveness

• Advanced Emotional and Tone Control: S1 isn't just about words; it's about how they are spoken. It supports over 50 emotions and tone markers, allowing flexible adjustment of voice expression through natural language instructions. This includes basic emotions (e.g., angry, happy, sad) and advanced nuances (e.g., disdainful, hysterical). Subtle sound effects like laughter, whispers, sobbing, sighing, and groaning can be incorporated directly into the script. This is powered by online Reinforcement Learning from Human Feedback (RLHF) technology, enabling S1 to precisely capture voice timbre and intonation for incredibly natural emotional expressions.
• Dynamic Voice Control: Full control over speech rate, volume, and pauses allows for highly personalized voice outputs.
• Ultra-Realistic Voice Cloning: OpenAudio S1 supports zero-shot and few-shot voice cloning, capable of generating high-fidelity cloned voices from as little as 10-30 seconds of audio samples, with the process taking less than a minute. This feature captures not just the tone, but also the unique speaking patterns, rhythm, and style of any voice. Testimonials confirm that a mere 15-second clip was enough to create an incredibly accurate voice replica.
• Powerful Multilingual Support: OpenAudio S1 boasts strong multilingual capabilities, covering 13 languages including English, Chinese, Japanese, Korean, French, German, Arabic, and Spanish. It can handle text in any language script as it does not rely on phonemes for TTS. Ultra-low latency for multiple languages makes it ideal for global audiences.
• Robust Technical Foundation: OpenAudio S1 adopts a unique dual autoregressive (Dual-AR) architecture for optimized stability and efficiency, enhancing codebook processing with GFSQ technology. It was trained on over 2 million hours of audio data with 4 billion parameters. For rapid processing, it achieves a real-time factor of approximately 1:5 on an Nvidia RTX 4060 laptop and 1:15 on an Nvidia RTX 4090.

Flexible Deployment and Accessibility

• OpenAudio S1 (4 Billion Parameters): The full-featured flagship model provides the highest quality speech synthesis and advanced features. This proprietary model is available on fish.audio.
• OpenAudio S1-mini (0.5 Billion Parameters): A distilled, open-source version designed for faster inference while maintaining excellent quality. OpenAudio S1-mini is fully open-source and accessible via Hugging Face Space, perfect for research and educational scenarios.
• Both models incorporate online Reinforcement Learning from Human Feedback (RLHF). For ease of use, OpenAudio S1 features an easy-to-use Gradio-based WebUI Inference and a PyQt6 GUI Inference. It is also deploy-friendly, with native support for Linux and Windows.

Diverse Applications

• Content Creation: Generate professional-grade voiceovers for videos, podcasts, and audiobooks, significantly improving production efficiency.
• Virtual Assistants: Create personalized voice navigation or customer service systems, supporting multilingual interactions.
• Games and Entertainment: Generate realistic dialogues and narrations for game characters, enhancing immersive experiences.
• Education and Accessibility: Provide high-quality text-to-speech services for visually impaired users or generate multilingual learning content for educational platforms.
• Rapidly create customized broadcasters or celebrity voice simulations.

Future Outlook

The release of OpenAudio S1 is just the beginning. Continuous innovation is a core focus, with plans to introduce real-time voice interaction features to enable seamless conversations with voice library characters. Through ongoing expansion of training data and optimization of RLHF, OpenAudio S1 is expected to support even more languages and complex emotional expressions, solidifying its leading position in the TTS field. OpenAudio S1 is poised to reshape the landscape of voice applications across virtual assistants, content creation, and the gaming industry.