Anthropic’s AI model Claude found a previously unknown enzyme system in DNA databases, doing most of the analysis on its own. Humans set the research question and ran the lab experiments. The system resembles the gene-editing tool CRISPR.

Anthropic calls it one of the first discoveries from its Bay Area biology lab, which opened in spring 2026. About 950 AI agents spent 21 hours combing through more than 200,000 reverse transcriptases, enzymes that convert RNA into DNA. Next to one unusual enzyme, they found repeating DNA sequences. The system, dubbed “ART,” shows up mostly in bacteriophages, viruses that infect bacteria. Its function is still unknown.

Lucas Harrington is less impressed. He earned his PhD under Nobel laureate Jennifer Doudna, who co-discovered CRISPR-Cas9, and co-founded Mammoth Biosciences with her. Mammoth uses genome mining to hunt for CRISPR systems itself. On X, Harrington wrote that the method has been around for decades and that similar systems have been known since 2008. The hard part is figuring out what a system actually does, and Anthropic hasn’t shown that. Presenting early results as a major discovery isn’t helpful, he said.