On Wednesday, Tether unveiled QVAC BotPsy, an 800-million-parameter AI agent designed to perform multi-step tasks on personal devices including phone settings, messaging and scheduling. According to Tether's technical testing, BotPsy outperformed competitors with up to 2.5 times larger models on five of six tool-use benchmarks, scoring 44.0% on BFCL v4 and 58.7% on ACEBench compared to 37.7% and 55.4% for the larger Qwen3.5-2B model respectively. Built on Alibaba's Qwen3.5-0.8B architecture, BotPsy is available as an open-weight model under the Apache 2.0 license and represents Tether's latest addition to its QVAC ecosystem for local AI deployment.

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