Fish Audio S2
UnclaimedThe most expressive open-source voice AI model for realistic and conversational speech generation.
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1 review trackedThe Bottom Line
Entry price
Free plan available, paid tiers above
Biggest pro
Exceptional expressiveness and realism in generated speech
Biggest con
Commercial use requires a separate license, which might be a barrier for some businesses
TL;DR - Fish Audio S2
- Generates highly expressive and realistic speech with fine-grained control over emotion and paralanguage.
- Features ultra-low latency (<150ms) for real-time conversational AI and interactive applications.
- Fully open-source model weights and inference code, supporting 80+ languages and custom fine-tuning.
Pricing: Free plan available
Best for: Growing teams
What is Fish Audio S2?
Fish Audio S2 is an advanced, open-source text-to-speech (TTS) model designed for unparalleled expressiveness, speed, and flexibility. It allows users to generate highly realistic and natural-sounding speech with fine-grained control over emotions, paralanguage, and multi-speaker conversations. Built from the ground up for real-time applications, S2 boasts ultra-low latency, making it suitable for conversational AI, live dubbing, and interactive voice experiences.
The model supports localized control over speech generation through natural language instructions embedded directly within the text, enabling users to add elements like laughter, whispers, sighs, and specific tones. With full open-source access to both inference code and model weights, developers can run S2 on their own infrastructure, fine-tune it with custom data, and integrate it without vendor lock-in. It supports over 80 languages and is built with an SGLang-based streaming inference engine for optimized performance.
Available on: Web
Pros & Cons
Pros
- Exceptional expressiveness and realism in generated speech
- Open-source nature allows for self-hosting, fine-tuning, and integration flexibility
- Low latency makes it ideal for real-time and interactive voice applications
- Extensive language support (80+ languages)
- Detailed control over speech characteristics through natural language tags
Cons
- Commercial use requires a separate license, which might be a barrier for some businesses
- The free tier has significant limitations on generation time and character count
- Advanced features like fine-tuning require technical expertise to implement
Ratings Across the Web
1(1 reviews)
Ratings aggregated from independent review platforms. Learn more
Preview
Key Features
Ultra-low latency speech generation (<150ms)Open domain control for emotions and paralanguage via natural text instructionsMulti-speaker conversations with seamless speaker switchingFully open-source inference code and model weightsSupport for 80+ languagesFine-grained inline control using natural language tags (e.g., [whisper], [emphasis])API access for integrationSGLang-based streaming inference engine for optimized performance
Pricing
Freemium
Fish Audio S2 offers a generous free tier with optional paid upgrades for advanced features.
Reviews
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Fish Audio S2 FAQ
How does Fish Audio S2 enable expressive speech generation?
Fish Audio S2 allows users to generate highly realistic and natural-sounding speech with fine-grained control over emotions, paralanguage, and multi-speaker conversations. It supports localized control over speech generation through natural language instructions embedded directly within the text, enabling elements like laughter, whispers, sighs, and specific tones.
Which teams would benefit most from using Fish Audio S2?
Teams developing conversational AI, live dubbing solutions, and interactive voice experiences would find Fish Audio S2 particularly useful. Its ultra-low latency and expressive speech generation capabilities are designed for real-time applications.
How is Fish Audio S2 priced?
Fish Audio S2 is available on a free tier, which offers limited generation time and character count. Paid plans are available for users requiring more extensive usage and additional features.
What kind of control does Fish Audio S2 offer over speech characteristics?
Fish Audio S2 provides detailed control over speech characteristics through natural language tags embedded directly within the text. This allows users to specify emotions, paralanguage, and even multi-speaker conversations with precision.
Can Fish Audio S2 be integrated into custom development environments?
Yes, Fish Audio S2 offers full open-source access to both its inference code and model weights. This allows developers to run the model on their own infrastructure, fine-tune it with custom data, and integrate it without vendor lock-in.
How does Fish Audio S2 compare to ElevenLabs for real-time applications?
Fish Audio S2 is built for real-time applications, boasting ultra-low latency suitable for conversational AI and live dubbing. Its open-source nature also provides developers with flexibility for self-hosting and fine-tuning, which differs from proprietary solutions.
What are the trade-offs when choosing Fish Audio S2 for commercial projects?
While Fish Audio S2 is open-source, commercial use requires a separate license, which may be a consideration for some businesses. Additionally, advanced features like fine-tuning the model necessitate technical expertise to implement effectively.
Source: fish.audio