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Kimi K3 built a full Windows XP operating system that runs entirely inside a web browser. The project emulates the classic desktop environment without requiring any local installation or virtual machine software.
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Summary by ByteBrief

Microsoft tests Moonshot AI's Kimi K3 for Copilot
Kimi K3 ranks second on AA-Briefcase benchmark

A joint preliminary evaluation by the UK's AISI and the US' CAISI finds Kimi K3 trails leading US frontier closed weight models on cyber capability (AI Security Institute)