Marker-Gated Abort

The marker-gated abort is described as the wall-clock lever because it cuts marker-less tails and trims successful rollouts after answers appear. The default abort keep probability is 0.05, with sensitivity tested across 0.01, 0.05, 0.10, and 0.20. Generation uses domain-specific answer markers including boxed answers for math, closing code fences for code, and answer spans for short-form QA. When no marker appears past the abort horizon plus grace window, the rollout is usually aborted but sometimes continued to EOS with importance weighting. When a marker appears, DUET keeps the rollout and stops shortly after the marker.