Chapter 25

25Reasoning and Test-Time Compute

Draft pending — this page is an outline of planned content. Write it by creating content/reasoning.md.

25.1Spending compute at inference

Planned: The shift from bigger models to longer thinking; the o1/R1 turn.

25.2RL on verifiable rewards

Planned: Training reasoning with automatically checkable answers (math, code).

25.3Search, self-consistency, and verification

Planned: Sampling many chains and selecting; process vs outcome reward.

25.4What this changes

Planned: New scaling axis, new costs, and the blurring of train/inference.