A preregistered replication of Columbia
The Receipts ON THE RECORD Put it on the record → Star On the Record File № 737 · Oct 2026 A Marcus field report The AI handed you a source. We clicked it. Marcus is open-source software that makes AI agents prove their work before anyone has to trust it. This file is what happened when we pointed it at one hard, measurable problem: whether AI search engines cite real sources. By Lawrence Gray, PhD, Gray Labs, who built Marcus. The dataset, the grader, and every audit record shown here are public, so you do not have to take my word for any of it. We gave four AI search engines a sentence from
A preregistered replication of Columbia
The Receipts ON THE RECORD Put it on the record → Star On the Record File № 737 · Oct 2026 A Marcus field report The AI handed you a source. We clicked it. Marcus is open-source software that makes AI agents prove their work before anyone has to trust it. This file is what happened when we pointed it at one hard, measurable problem: whether AI search engines cite real sources. By Lawrence Gray, PhD, Gray Labs, who built Marcus. The dataset, the grader, and every audit record shown here are public, so you do not have to take my word for any of it. We gave four AI search engines a sentence from
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