arXiv Machine Learning By Yuxuan Wang, Yishu Wang, Jiaqi Deng

Benchmarking Forecasting Agents on Yesterday's Tomorrows

Read the original on arXiv Machine Learning →

The paper introduces FABench, a scalable backtesting environment designed to evaluate forecasting agents. FABench automatically discovers events, generates questions, and resolves outcomes for any past forecast date, allowing continuous renewal beyond model training cutoffs. In initial tests, retrieval improves Brier scores across eight models, with top agents matching or surpassing market consensus on 54 Polymarket-linked questions, yet analysis shows persistent evidence‑weighting failures that highlight room for improvement.

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