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.
Current rank (1M)
63
Rank over the last 30 days
2026.09.08 – 2026.10.07 · High 49 · Low 85 · Now 63
ElevenLabs released Eleven v4, a voice model with stronger emotional expression, and its low-latency variant Eleven v4 Turbo. Turbo reaches first speech in about 150 milliseconds, and both models support more than 90 languages.
Inworld AI says it has reclaimed the top spot on Artificial Analysis's leaderboard, which Cartesia took just two weeks earlier
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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