I have written a lot about reasoning models here over the last two years on Ahead of AI, including a recent article on mechanisms to control reasoning effort levels in contemporary LLMs. Reasoning models are still as relevant as ever. In fact, almost all current-generation LLMs today are reasoning models or offer a reasoning mode. For those who are interested in how reasoning models work, including inference scaling, reinforcement learning, and distillation, I wrote my recent Build Reasoning Model (From Scratch), which implements these from the ground up in PyTorch, which, in my experience, is