OpenAudio Releases Open Source TTS Model S1-Mini: Super Natural AI Voice Created with 0.5B Parameters

AIbase基地

Published inAI News · 6 min read · Jun 6, 2025

An important advancement has been made in the field of AI voice technology as Fish Audio announces the open-source release of its new Text-to-Speech (TTS) model, OpenAudio S1-Mini. As a streamlined version of the highly praised S1 model, S1-Mini has sparked industry discussions due to its lightweight design, high expressiveness, and multilingual support.

Technical Highlights: Lightweight and High Performance Coexist

OpenAudio S1-Mini is a lightweight version distilled from the 4B-parameter S1 model, containing only 0.5B parameters, significantly reducing computational requirements for deployment in resource-constrained environments such as edge devices or localized applications. Despite the reduced parameter count, S1-Mini retains the core advantages of S1, trained on an extensive audio dataset of over 2 million hours, supporting 14 languages (including Chinese, English, Japanese, French, etc.), and capable of generating more than 50 types of emotional and tonal voice expressions. Whether it’s anger, happiness, surprise, laughter, crying sounds, or other special effects, S1-Mini can produce natural pronunciation close to human voices, showcasing strong expressiveness.

Open Source Advantage: Empowering Developers and Communities

The open-source release of S1-Mini is an important step by OpenAudio towards democratizing AI voice technology. The model is available on the Hugging Face platform, allowing developers to download it for free and use it in non-commercial scenarios. Compared to closed-source TTS models that require high subscription fees, the open-source nature of S1-Mini greatly reduces development barriers, providing small teams and independent developers with access to high-quality text-to-speech synthesis capabilities. Additionally, OpenAudio provides an online experience platform for users to intuitively feel the model's effects. This open strategy not only promotes technological iteration but also enhances community trust, laying the foundation for widespread application of voice AI.

Performance Comparison: Challenging Industry Giants

According to third-party benchmark tests (such as Hugging Face's TTS Arena), OpenAudio S1 has surpassed certain models from competitors like ElevenLabs and OpenAI in performance, while S1-Mini, as its streamlined version, still performs excellently in terms of naturalness and emotional expression. Thanks to RLHF (Reinforcement Learning with Human Feedback) optimization technology, S1-Mini demonstrates remarkable results when generating coherent and emotionally rich speech, particularly standing out in multilingual scenarios and complex dialogues. Although currently not usable for commercial purposes, its open-source nature offers significant value for academic research and personal projects.

Application Prospects: Broad Scenarios from Education to Entertainment

S1-Mini’s lightweight design makes it suitable for various scenarios, including language learning tools in the education sector, audiobook and podcast generation in the entertainment industry, and voice synthesis in interactive applications. Its support for special sound effects (such as laughter and shouting) provides content creators with more creative space. Additionally, its multilingual support gives it competitive advantages in global markets, especially showing potential in the field of voice generation for non-English languages. AIbase believes that the release of S1-Mini will further promote the popularization and innovation of open-source TTS technology globally.

Future Outlook: Continuous Momentum for the Open Source Ecosystem

The release of OpenAudio S1-Mini not only provides developers with efficient tools but also injects new vitality into Fish Audio’s open-source ecosystem. In the future, Fish Audio plans to continuously optimize the performance of S1-Mini and may release versions supporting more languages and real-time applications. AIbase predicts that with the participation of the open-source community, S1-Mini will accelerate the iteration of voice technologies, challenging the monopolistic positions of existing commercial models and bringing more possibilities to the industry.

AIbase will continue to track the latest developments of OpenAudio and TTS technology to bring you cutting-edge reports.

Project: https://huggingface.co/fishaudio/openaudio-s1-mini

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