Fish Audio officially launched its latest generation of voice generation model—OpenAudio S1, which boasts highly natural sound, rich tone control, and strong instruction-following ability, claiming to reach the expressiveness and naturalness of professional voice actors. This model ranked first on the TTS-Arena leaderboard, becoming a new benchmark in the text-to-speech (TTS) field. AIbase provides an in-depth analysis of OpenAudio S1's breakthrough features and potential impact.
OpenAudio S1: Redefining the AI Voice Generation Experience
OpenAudio S1 is a brand-new upgrade of Fish Audio based on the Fish Speech series, achieving unprecedented levels of speech naturalness and expressiveness thanks to advanced architectural design and large-scale training data. Key highlights include:
Highly natural sound: Generated voices are smooth and realistic, almost indistinguishable from human voiceovers, suitable for professional scenarios such as video dubbing, podcasts, and game character voices.
Wealth of tone control: Supports over 50 emotions and tone markers, such as (angry), (happy), (sad), (whisper), (sympathy), etc., allowing users to flexibly adjust voice expression through natural language instructions.
Strong instruction-following capability: Users can control details like speech rate, volume, pauses, and even laughter with simple text commands, creating highly personalized voice outputs.
With 2 million hours of audio training data, OpenAudio S1 has made significant breakthroughs in both quality and diversity of voice generation, covering 13 languages including English, Chinese, Japanese, Korean, French, German, Arabic, and Spanish, demonstrating its powerful multilingual capabilities.
Video provided by the official source, translation: Xiao Hu
TTS-Arena Ranks First: Professional-Level Certification
In the latest evaluation by TTS-Arena, OpenAudio S1, under the name "Anonymous Sparkle," topped the list, outperforming numerous open-source and proprietary models. TTS-Arena compares the naturalness and expressiveness of different TTS models through user voting, and OpenAudio S1 received widespread recognition for its realistic voice quality and delicate emotional expression.
In addition, OpenAudio S1 performed exceptionally well in Seed TTS assessment, with an English word error rate (WER) as low as 0.008 and a character error rate (CER) of only 0.004, far surpassing traditional models, proving its leading position in terms of speech accuracy.
Technical Highlights: Dual-AR Architecture and RLHF Training
Innovative Dual-AR Architecture
OpenAudio S1 adopts a unique dual autoregressive (Dual-AR) architecture, combining fast and slow Transformer modules to optimize the stability and efficiency of voice generation. This architecture enhances codebook processing capabilities through grouped finite scalar vector quantization (GFSQ) technology, ensuring high-fidelity voice output while reducing computational costs.
RLHF-Driven Emotional Expression
OpenAudio S1 significantly enhances voice emotional expression capabilities through online **reinforcement learning and human feedback (RLHF)** technology. Compared to traditional TTS models, S1 can more precisely capture voice timbre and intonation, generating more natural emotional expressions. For example, users can achieve delicate emotional control through markers like (excited), (nervous), or (joyful), meeting diverse needs from advertisements to virtual assistants.
Practical Applications: Infinite Possibilities from Creativity to Commerce
The multifunctionality and high performance of OpenAudio S1 showcase immense potential across multiple fields:
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.
Convenience of Voice Cloning
OpenAudio S1 supports zero-shot and few-shot voice cloning, requiring only 10-30 seconds of audio samples to generate high-fidelity cloned voices, with the process taking less than a minute. This feature is particularly suitable for scenarios requiring rapid generation of personalized voices, such as customized broadcasters or celebrity voice simulations.
Open Source and Commercial Use: Flexible Deployment Options
OpenAudio S1 offers two versions: **S1 (4B parameters, proprietary model) and S1-mini (0.5B parameters, open-source model)** to meet different user needs. S1-mini is fully open-source, allowing developers to access and customize it freely via GitHub, suitable for research and educational scenarios; while S1 provides high-performance support through cloud services at an affordable pricing model, ensuring cost controllability.
User feedback shows that OpenAudio S1 surpasses competitors like ElevenLabs in terms of voice realism and emotional delicacy, especially excelling in multilingual support and production efficiency. Cloud processing speed is extremely fast, generating high-quality voice in an average of 20 seconds, and supports batch processing, making it suitable for large-scale commercial applications.
Future Outlook: A New Chapter in Voice Interaction
Fish Audio stated that the release of OpenAudio S1 is just the beginning. In the future, the team plans to introduce real-time voice interaction features, enabling seamless conversations with voice library characters, further enhancing interaction experiences. Additionally, through continuous expansion of training data and optimization of RLHF, S1 is expected to support more languages and more complex emotional expressions, consolidating its leading position in the TTS field.
AIbase believes that the launch of OpenAudio S1 marks an important shift toward professionalism and accessibility in AI voice technology. Its powerful multilingual support and emotional control capabilities not only provide developers with innovation space but also bring more natural voice interaction experiences to ordinary users. With the arrival of real-time interaction functions, OpenAudio S1 is expected to reshape the landscape of voice applications in virtual assistants, content creation, and the gaming industry.