When the model is replaced

Model names change and parameters are added. The identifiers used in the examples will eventually be superseded, and when they are, every example still works if you change two strings in one file; Chapter 1 shows you where that file is.

Newer models invent fewer facts and follow instructions more closely. Neither rate reaches zero, and the wrong answers that remain read exactly as well as the right ones. The check in Chapter 3 is written for that, and it will still be needed when the models in this book are two generations old.

Chapter 1 is about forty lines of TypeScript, starting on the next page.