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Anthropic says Claude found a CRISPR-like enzyme system, drawing caution from gene-editing researchers

September 24, 2026 at 20:25 EDT

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Healthcare

Anthropic said its Claude model, running roughly 950 software agents, identified an undescribed enzyme system in viruses that infect bacteria and likened the structure to CRISPR. Gene-editing researchers urged caution, saying the system's function is unknown and that the company has overstated how much the observation means.

Sep 23, 2026 · Anthropic

A CRISPR-like enzyme find, function still unknown

Roughly 950 Claude agents spent 21 hours searching DNA and flagged a bacteriophage enzyme system called ART. The company has not shown what it does, and gene-editing researchers say the CRISPR comparison runs ahead of the evidence.

Same scale, three counts

More than 200,000 enzymes, 20 reports

Column height is linear with the count. The later stages are drawn to that scale, which is why they nearly vanish beside the full search.

200,000+

Reverse transcriptases screened

3,500

Candidate systems kept

Full written reports

More than a 10,000-fold cut from the enzymes gathered to the 20 reports. More than 57 times as many enzymes were screened as candidates were kept.

Hours the agents searched

~950

Claude agents run in parallel

210M

Tokens used in the search

How the result was produced

Agents searched. People did the experiments.

1 · Broad prompt

→

2 · Agents mine DNA

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3 · Repeat array flagged

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4 · Humans test in the lab

Why some see a lead

Intriguing, and worth a closer look

CRISPR pioneer Feng Zhang called RNA-repeat arrays tied to reverse transcriptases genuinely intriguing and said the finding merits further investigation. The agents chose which lead to follow from a high-level prompt.

Why others are unconvinced

Not shown to be a gene editor

Lucas Harrington called the search routine genome mining and said the hard part, learning what the system does, has not been done. Dario Amodei says any biotech use, and the level of significance, are not yet clear.

What is still open

A familiar shape is not a working tool

Architecture. A known reverse transcriptase, a partner gene, and a repeat array that makes short RNAs, mainly in bacteriophages.

Not shown. The natural function, whether it can be programmed, and any ability to cut, copy, or paste DNA.

The lab. Biosafety levels 1 and 2 only. No human pathogens. People, not the model, run every experiment.

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