Tether Releases 800-Million-Parameter On-Device AI Agent Model BotPsy

on November 11, according to a Tether announcement, Tether AI Research released the open-weight model QVAC BotPsy. With 800 million parameters and based on Alibaba's Qwen3.5 architecture, the model is designed for tool calling and agent tasks on personal devices.

Tether noted that BotPsy scored approximately twice its base model across four benchmarks: BFCL v4, ACEBench, τ-bench, and ToolSandbox, surpassing the 2-billion-parameter Qwen3.5-2B-Think. The model converts user requests into local tool calls, enabling developers to adapt and deploy its weights within their own systems.