Anthropic Says Its Biology Lab Has Already Found Something Big

Anthropic’s new AI-powered biology lab has announced its first major discovery: a previously unknown enzyme system with CRISPR-like properties, found largely by the Claude AI model working autonomously.

Anthropic announced on Wednesday the first discovery from its molecular biology lab, a previously unknown enzyme system spotted by its Claude model. The company is touting it as proof that AI can accelerate basic research .

The finding was announced alongside the launch of Anthropic’s life sciences research group and laboratory in the Bay Area, which uses Claude to examine DNA datasets, identify unknown protein families, and generate hypotheses for testing by human scientists .

What Claude Found

The system that Claude discovered is based on a reverse transcriptase, an enzyme that copies RNA into DNA. The underlying reverse transcriptase, found in a jumbo phage, had been identified in previous studies. However, Claude appears to be the first to notice the system’s defining features: an associated array of non-coding DNA sequences and an additional accessory protein of unknown function .

Anthropic named the system array-associated reverse transcriptases, or ART. It consists of three components: a reverse transcriptase, a neighboring partner gene, and a long array of evenly spaced DNA repeats .

The repeat arrangement resembles a CRISPR array, a DNA structure that can produce RNA molecules used by CRISPR-Cas systems for targeted genetic activity. Anthropic stressed that further testing is required to establish what ARTs actually do .

Feng Zhang, an MIT professor and one of the pioneers of CRISPR genome editing, reviewed Anthropic’s preprint and described the connection between reverse transcriptases and RNA-repeat arrays as “genuinely intriguing” and worthy of further investigation .

How the Search Ran

Anthropic researchers gave Claude a high-level prompt to search a large DNA sequence database for unusual examples of reverse transcriptases. Over 21 hours, approximately 950 Claude agents used 210 million tokens to gather more than 200,000 reverse transcriptases, identify 3,500 candidate systems, and narrow them to 20 considered worthy of deeper investigation .

One agent detected a repeating DNA pattern beside the gene for an unusual reverse transcriptase. After further analysis and testing in Anthropic’s lab, the team recognized that this pattern marked a previously uncharacterized enzyme system found in bacteriophages (the viruses that infect bacteria) .

Anthropic said this type of analysis would typically take expert scientists weeks or even months to complete .

What Is Not Yet Known

The function of the newly identified system, dubbed ART, remains unknown. Anthropic said its initial experiments suggest the system could, like CRISPR, be programmable, but stressed that further testing is required .

The significance and novelty of Anthropic’s finding will still need to be validated by the broader research community. The results were published as a preprint and have not yet been reviewed by other scientists .

Anthropic CEO Dario Amodei acknowledged that the discovery builds on previous research and said a Stanford team had independently described a comparable but distinct system .

Some researchers have expressed skepticism about the scientific significance of the announcement. Kevin Blake, a microbiologist at Washington University School of Medicine, told Al Jazeera that “there’s nothing to indicate this is a rival to CRISPR-the-technology, or could be developed into any kind of therapeutic or practical application” .

The Lab Behind It

Anthropic formed its life sciences research group in spring 2026. The Bay Area lab works only at the two lowest biosafety levels (BSL-1 and BSL-2) and does not handle pathogens capable of infecting humans. All lab work is performed by human scientists .

The team uses Claude Science and Claude Code, tools available to any researcher, to conduct their work .

Amodei did not rule out the possibility that Claude could eventually operate lab equipment itself, provided appropriate safety measures are in place. “Eventually it may even be possible for Claude itself to safely perform the experiments by autonomously controlling lab equipment, with appropriate safeguards in place, but we aren’t doing that today,” he said .

The Bigger Picture

The revelation that Anthropic has been conducting biology experiments comes amid ongoing debate about AI safety. Amodei himself has said one of the things he fears most is that AI could be used for bioterrorism. But he also believes AI will “cure most diseases in 5-10 years” .

Amodei mentioned the discovery in a video address to the UN Security Council on September 23. He stated that the discovery is only in its “preliminary” stage, but “may constitute a new gene editing mechanism that could have applications in gene therapy.” He predicted “profound progress in the near future on diseases that have plagued humanity for millennia” .

AI-powered biological research is hardly unique to Anthropic. Researchers at Stanford have published work involving large language models and CRISPR, while researchers at the University of California, San Francisco have used AI to design enzymes from scratch. Google launched its AI-powered biology research tool AlphaFold in 2020 .

Anthropic says work to understand the primary function of ARTs is ongoing. The company has released a preprint detailing the findings and is asking other scientists to send research proposals .