The free Stanford lecture on how ChatGPT and Claude work (1:44:31): a clickable timestamp map, the lecture in plain English, and a guide to getting the most out of Claude Opus 5.5

The companion to the reel. PAGE 1 — the link to Stanford's free CS229 lecture 'Building Large Language Models' by Yann Dubois (1 hour 44 minutes) and how to use the guide. PAGE 2 — a clickable timestamp map built from the full transcript, plus a 60-minute path. PAGE 3 — the lecture in plain English: next-word prediction, pre-training vs post-training, scaling laws, why AI makes things up, and what each idea changes about how you use AI. PAGES 4-5 — the Opus 5.5 guide: where to use it, the effort setting most people miss, which effort to pick, and 5 habits tested on Opus 5.5. Facts checked on October 6, 2026. Independent guide from Hyperautomation Labs — not affiliated with Stanford, Stanford Online, the speaker or Anthropic.

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