Fish Audio S2
Fish Audio S2 is an advanced, open-source text-to-speech (TTS) model designed for unparalleled expressiveness, speed, and flexibility.
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Our verdict
Who it's for
The most expressive open-source voice AI model for realistic and conversational speech generation.
Who should look elsewhere
Commercial use requires a separate license, which might be a barrier for some businesses
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
Key features
- ✓Ultra-low latency speech generation (<150ms)
- ✓Open domain control for emotions and paralanguage via natural text instructions
- ✓Multi-speaker conversations with seamless speaker switching
- ✓Fully open-source inference code and model weights
- ✓Support for 80+ languages
- ✓Fine-grained inline control using natural language tags (e.g., [whisper], [emphasis])
- ✓API access for integration
- ✓SGLang-based streaming inference engine for optimized performance
Pricing
No public pricing plans recorded.