Cartesia Sonic-3.6 tops both voice synthesis leaderboards
It won even in a test that standardizes voices and pits only the engines against each other, using an SSM architecture instead of a transformer
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Cartesia
Cartesia is a company that develops speech synthesis and voice AI models. Its flagship model is the Sonic series, used to convert text into natural-sounding speech. In August 2026, Cartesia's Sonic-3.6 was reported to have simultaneously ranked first on two speech synthesis leaderboards.
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