Renmin University & Microsoft Research · Agent Framework

Arbor

Generalist autonomous-research agent built on Hypothesis-Tree Refinement: a long-lived coordinator + short-lived executors grow a persistent tree linking hypotheses, artifacts, evidence and distilled insights, pruning failures and propagating lessons. Best held-out results on all six tested research tasks at >2.5x the average gain of Codex/Claude Code; 86.36% Any Medal on MLE-Bench Lite with GPT-5.5.