Anthropic’s AI Claude identifies intriguing DNA stretch in bacteriophages

Anthropic just gave its AI model Claude a biology homework assignment, and Claude may have aced it. The company announced on September 23 that a swarm of roughly 950 autonomous Claude agents discovered a previously unrecognized enzyme system lurking in the DNA of bacteriophages, the viruses that infect bacteria.

The system has been named array-associated reverse transcriptases, or ART. It consists of three components: a reverse transcriptase enzyme, an accessory protein whose function remains unknown, and a series of evenly spaced non-coding DNA repeats that look strikingly similar to CRISPR arrays. If that last part rings a bell, it should. CRISPR is the gene-editing technology that reshaped modern biology.

How Claude found what humans missed

The discovery wasn’t the product of a single chatbot session. Anthropic deployed approximately 950 Claude agents that ran autonomously for 21 hours, chewing through around 210 million tokens of genomic data in the process. Those agents screened more than 200,000 reverse transcriptases and flagged roughly 3,500 candidate systems worth a closer look. From that pool, they distilled the findings down to 20 specific systems deemed worthy of detailed analysis and reporting.

The reverse transcriptase component of ART wasn’t entirely new to science. Previous studies had identified it within so-called jumbo phages, a class of unusually large bacteriophages. But the full multi-component system, with its accessory protein and CRISPR-like repeat arrays, had never been characterized as a cohesive unit before.

Critically, this wasn’t just an AI making bold claims into the void. Human scientists at Anthropic’s newly established wet lab in the Bay Area ran experiments to validate Claude’s computational findings. The lab operates at BSL-1 and BSL-2 biosafety levels and focuses exclusively on fundamental biology research rather than clinical applications.

What ART actually is, and what it isn’t

No practical applications for ART have been determined yet. Nobody knows what the accessory protein does. The biological function of the system as a whole remains a mystery.

Feng Zhang, one of the pioneers behind CRISPR gene-editing technology, called the findings “genuinely intriguing” and suggested they deserve further investigation.

The ART system features between 3 and 21 DNA repeats arranged in arrays. Anthropic CEO Dario Amodei noted that the discovery builds on prior work connected to research at Stanford University. The announcement represents the first published results from Anthropic’s life sciences research group, which was established in spring 2026 with the explicit goal of using AI for fundamental biology research, hypothesis generation, and experimental validation.

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