Fish Audio S2 Pro is the new leading Open Weights model on the Artificial Analysis Speech Arena Leaderboard, closing the gap between Open Weights and Proprietary models

Fish Audio S2 Pro is the latest TTS model from Fish Audio, featuring multi-speaker, multi-turn generation and inline prosody and emotion control using natural language tags, e.g., [whisper], [laughing], [excited tone], and [professional broadcast tone]. It was trained on 10M+ hours of audio across 80+ languages, with weights and fine-tuning code available on Hugging Face and an API available on their platform.

Key takeaways:
➤ Quality: Fish Audio S2 Pro has an Elo of 1,165, placing it 6th overall and 1st for Open Weights models ahead of other top Open Weights models, Step Audio EditX (1,105), and Kokoro 82M v1.0 (1,057).
➤ Pricing: The model’s API is priced at $15/1M characters via the Fish Audio platform, and is also available for self-hosting via weights on Hugging Face.
➤ Speed: Fish Audio S2 Pro processes 51 characters per second. For comparison, Kokoro 82M v1.0 hosted on Replicate processes 290 characters per second.

See more details and listen to samples below ⬇️