Loop & Harness EngineeringRuiyao Xu et al.
Harness² released
Harness² released — a framework that combines task-level recursion (Propose-Probe-Compose), which edits the harness for each open-world task without ground-truth verifiers, with harness-level recursion that accumulates that experience into an improvement harness for future tasks
Why it matters
The authors reported that a single step raised GLM-5 and Gemini 3.5 Flash over their base harnesses by up to 11.5 points on WorkBuddy-Bench, 4.5 points on JobBench and 11.8 percentage points on LAB. Research on recursive self-improvement that edits the harness rather than the model continues
Source — Primary sources first; secondary reports are labelled “Press”
Paperarxiv.orghttps://arxiv.org/abs/2610.14224Added in Week 42, 2026 · See that week