The Sparse Giant: How Kimi K3 Runs Like a Model Ten Times Smaller Than It Is

There is a lovely moment in Arthur C. Clarke’s fiction where a machine does something so far beyond expectation that the humans watching it stop asking how fast and start asking how. I had that moment in July 2026 when Moonshot AI shipped Kimi K3: a 2.8-trillion-parameter open-weight model, the largest ever released to the …

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Is Your Model’s Accuracy Real, or Did It Just Get Lucky?

The Feynman Test for Not Fooling Yourself About Test-Set Accuracy “The first principle is that you must not fool yourself — and you are the easiest person to fool.” — Richard Feynman I keep Feynman’s line taped, metaphorically, to the inside of every model I train. Because here is the uncomfortable truth about that beautiful …

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Why “Act As An Expert” Prompts Make AI Dumber | 2026 Guide

In 1974, the legendary physicist Richard Feynman stood before the graduating class at Caltech and told them a story about the South Sea islanders. During World War II, these islanders had watched magnificent flying machines descend from the sky, bringing with them endless supplies of cargo. When the war ended and the planes stopped coming, …

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Agentic AI Engineering: 5 Lessons from the Claude Code Leak (TL;DR)

When the Claude Code source code leaked, exposing 512,000 lines of proprietary architecture, it didn’t cause an industry panic—it sparked an epiphany. The core autonomous execution loop was surprisingly simple. In fact, it was so architecturally transparent that a developer rebuilt a functional Python port over a single weekend using LLMs. This revelation accelerates a …

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