Oct 19, 2026

Version-Controlled Search: The Web as It Was — Ryan Ahern, Exa

Ryan Ahern of Exa presents Exa Snapshot, a point-in-time web search that lets agents query the web as it appeared on any past date, and shows how teams can backtest predictive signals and financial models without overfitting.

Oct 19, 2026

Backtest Your Agent Against Yesterday's Web — Ryan Ahern, Exa

Ryan Ahern of Exa explains how version-controlled search through Exa Snapshot lets you view the web as it existed on a past date, enabling backtests of AI agents while avoiding look-ahead bias. A hands-on acquisition-prediction exercise illustrates feature tuning and the dangers of overfitting without holdout sets.