Anthropic announced on September 23, 2026, that Claude agents helped identify an array-associated reverse transcriptase system, or ART, in bacteriophages—viruses that infect bacteria. The system’s DNA-repeat arrangement resembles CRISPR, but ART’s biological function remains unknown, and gene-editing activity has not been demonstrated.
What Claude searched for—and what scientists did next
Anthropic says about 950 Claude agents searched DNA-sequence data for 21 hours, using 210 million tokens. The agents examined more than 200,000 reverse-transcriptase sequences, selected 3,500 candidate systems and produced detailed reports on 20 candidates.
Scientists supplied the initial research prompt, reviewed the candidate and performed the laboratory work. Claude’s reported role was in the computational search; the experiments were done by human scientists.
What ART has in common with CRISPR
Anthropic describes ART as a reverse transcriptase, a neighboring partner gene and an array of evenly spaced, non-coding DNA repeats. A reverse transcriptase is an enzyme that makes DNA from an RNA template. The reported system occurs in bacteriophages.
The CRISPR comparison is about the arrangement of repeated DNA sequences. Anthropic reports that the ART array was expressed as distinct short RNAs in its first experiments. That observation does not establish what the system does biologically.
The reverse transcriptase had already been identified
Earlier research had identified the reverse transcriptase itself. The potentially new finding described by Anthropic is its association with the repeat array and neighboring partner gene—not the enzyme’s first identification.
ART’s biological function remains unknown
Anthropic says it is still investigating ART’s primary function. The research was released as a preprint on September 23 and had not been peer-reviewed by September 29. The reported work has not demonstrated that ART can edit genes or serve as a biotechnology tool.
