TL;DR: Kimi K2 Thinking is Moonshot AI's open-source reasoning model, scoring 44.9% on Humanity's Last Exam with the ability to chain 200-300 sequential tool calls while maintaining coherent reasoning. The 1-trillion parameter MoE architecture activates only 32B parameters per inference. Fully open weights mean you can inspect reasoning chains, fine-tune on domain data, and deploy on your infrastructure; though production deployment requires serious GPU capacity.
