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DeepSeek Open-Sourced Its Agent Harness Under MIT Alongside V4 Pro's General Availability, and Practitioners Say Setup Is the Selling Point
DeepSeek moved its 1.6-trillion-parameter V4 Pro 0813 from preview to GA on 2026-08-21 with MIT-licensed weights, and shipped DeepSeek Harness, an MIT plugin-based agent framework where models, tools, storage and the agent loop are all swappable. It remains in developer preview. The r/LocalLLaMA reaction thread is notable for what it praises: not coding ability but that the web UI supports checking in periodically rather than babysitting, and that progressive setup made configuration frictionless compared to Hermes.
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