TL;DR: We propose Lookahead Reasoning (LR), a technique that significantly accelerates large reasoning models(LRMs) and complements existing speculative decoding methods. Traditional token-level speculative decoding suffers from limited gains because the probability of correctly guessing a long sequence decreases exponentially with length. In contrast, LR operates at the step level, proposing future reasoning steps instead of individual tokens. This is much more effective since a proposed ste...
