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Kimi K3 Goes Open Source Tonight: 2.8 Trillion Parameters, World's Largest, As Yang Zhilin Closes the China-US Model Gap to 3 Months

On the evening of July 27, Moonshot AI open-sourced Kimi K3's weights: a 2.8-trillion-parameter MoE with a 1-million-token context, the world's largest open-source model, benchmarking against Anthropic's Fable 5. From the July 16 API launch to tonight's weight release, Yang Zhilin used ten days to compress the China-US model gap from 6-9 months to 3-5. Breakdown of specs, benchmarks, the comeback story, and the White House accusation.