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We recommend using Fish Audio S2.1-Pro for production projects. It improves on S2-Pro quality, latency, and throughput, and is the right choice when you need production TTFA and DPA guarantees. Use s2.1-pro-free for testing, prototyping, development, and smaller businesses. It is the same model as S2.1-Pro at $0, but it does not guarantee TTFA or DPA.

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