Tether launches microscopic medical AI that runs on phones and outperforms models up to 16 times larger. Tether has just released QVAC MedPsy, a healthcare-focused AI model that can run entirely on a phone without a cloud connection. The company's 1.7 billion-parameter model outperformed Google's MedGemma-27B, which was nearly 16 times larger on the HealthBench Hard clinical benchmark, scored by 262 doctors. A key highlight is its processing performance: the 4 billion parameter model uses only 3.2 times fewer Token than comparable systems, enabling deployment in hospitals or remote clinics without the need for cloud infrastructure. Despite the impressive benchmark results, experts still emphasize that medical AI should play a supporting Vai , not replace doctors' judgment.