Cartesia releases new TTS and STT models Sonic-3.5 and Ink-2 According to Beating monitoring, AI speech modeling startup Cartesia announced the release of Sonic-3.5 and Ink-2, and the launch of a unified real-time speech intelligent agent technology stack composed of the two models. Sonic-3.5 is responsible for text to speech (TTS), while Ink-2 is responsible for speech to text (STT). Sonic-3.5 leans towards real-time low latency speech generation, with the first sound output time reduced to 90 milliseconds. The factory supports 42 languages and can pronounce English homophones and alphanumeric characters without pre-processing. The Word Error Rate of Ink-2 has been reduced to 3.6%, while introducing Native Turn Detection and noise processing mechanisms to determine whether the user has finished speaking based on sentence meaning and semantic understanding, rather than relying solely on traditional quiet time. At present, Ink-2 is only available in English, and a multilingual version will be released in the future. Developers can call both models simultaneously through a single API. Sonic-3.5 and Ink-2 are designed for bidirectional streaming collaboration to reduce transmission delays and system losses caused by "multi vendor splicing". [Original link]