Leakage_tmlr_accepted_2026

Temporal Leakage in LLM Backtesting: Measurement, Validation, and Adjusted Scores is officially accepted at TMLR, with a decision of “accept as is.” That completes the backtesting trilogy alongside NeurIPS 2026 and the Findings of EMNLP 2026. This paper supplies the theory: leakage inflation cannot be identified from a passive backtest alone, and one external reference restores a leakage-adjusted score. Code and data are public.