o3 isn’t one of the biggest developments in AI for 2+ years because it beats a particular benchmark. It is so because it demonstrates a reusable technique through which almost any benchmark could fall, and at short notice. I’ll cover all the highlights, benchmarks broken, and what comes next. Plus, the costs OpenAI didn’t want us to know, Genesis, ARC-AGI 2, Gemini-Thinking, and much more.