Humanness Index™ · Provider
Cartesia was founded by the researchers who created state space models, the S4 and Mamba architectures from their academic work.
Standings as of Jun 13, 2026, 00:15 UTC
Cartesia was founded by the researchers who created state space models, the S4 and Mamba architectures from their academic work. Every Sonic generation is a state space model rather than a Transformer, which is the architectural basis of the latency claims the family is known for.
Sources: cartesia.ai
Four Sonic generations sit on the Humanness Index™, from the May 2024 debut model to the current Sonic 3.5 flagship. Since Sonic 3 the platform has carried SOC 2 Type II, HIPAA, and PCI Level 1 compliance, aimed at regulated phone work.
Sources: docs.cartesia.ai
The benchmark is open source. Suggest a model, read the methodology, or ask us to put your voice in the arena.
