Reasoning model
A model trained to work through a problem in steps before answering, spending tokens on thinking that you pay for and usually do not see.
how it works · the vocabulary
chain of thoughtthinkingtest-time compute
It buys accuracy on mathematics, code and multi-step problems, and costs both money and latency. Most sellers expose an effort setting; the difference between low and high effort on the same model can be a factor of ten in cost.