Anthropic Blocks Users After Claude Is Linked to Potential Bioweapons Research

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The AI giant Anthropic recently issued a disturbing threat report, a bracing reminder that artificial intelligence’s “dual-use” promises are not confined to better search results, clever chatbots, fun videos, and online research efficiency.

The company says it shut down accounts belonging to scientists who used its Claude model in ways that could have supported biological-weapons research, including work related to making avian influenza more capable of infecting mammals.

The revelation was shared in a lengthy report that also divulged other harmful activity involving surveillance, scams, conventional weapons development and propaganda. The cases in the report are examples of “the most notable and novel threat activity” identified by Anthropic so far, the company said. Threat actors included criminals, suspected state-sponsored groups, spyware vendors and state propaganda institutions, the report said.

Anthropic shared five cases involving activity that had the potential to support the development of biological weapons. It called biological misuse “one of the most serious risks of frontier AI models.”

The company said the cases identified “provide evidence of capability” of the AI models, but “cannot concretely demonstrate that such capability would ever be used to develop biological weapons in the real world.”

The people involved in these cases are working scientists, whom Anthropic chose not to identify. The company said it can’t “assert that they intended harm.”

I will simply note that back in the spring of 2025, I reported that the H5N1 clade 2.3.4.4b genotype B3.13 outbreak fancy name for the nasty bird flu virus we have been contending with over the past few years) may have originated in gain-of-function-style serial-passage research at the USDA Southeast Poultry Research Laboratory in Georgia and Erasmus Medical Center in the Netherlands, then escaped and spread through migratory waterfowl. This finding is from a 2024 paper by Nicolas Hulscher and co-authors that interprets genetic similarities, laboratory biosafety concerns, and mutations in recent cases as circumstantial evidence.

Therefore, the findings from this paper are likely stashed in the AI files and are available for other manipulations and enhancements.

The lengthy report that Anthropic published also described other misuses on various models of its Claude A.I. chatbot over the past eight months.

Some examples were similar to past disclosures from Anthropic and other A.I. labs, including suspected Chinese and Iranian government-linked actors targeting dissident and diaspora communities for surveillance.

The report also highlighted cases of Russian state media using Claude to generate online propaganda masquerading as independent reporting, including fabricated claims about an election in Moldova.

Anthropic documented another genre of abuse it said was new: attempts to use Claude to develop software for conventional weapons design and development, including firearms, missiles, armed drones and bombs. It detailed three cases in China, two in Russia and one in Yemen.

…But among all the categories of threats shared in the report, none may be as worrisome as the biological research cases. Anthropic did not disclose the names of researchers or institutions that it blocked, their countries of affiliation or the specific biological agents at issue, in part because of its uncertainty about their aims.

The Anthropic report also detailed several Iran-linked cases in which actors allegedly used Claude to support influence campaigns, surveillance efforts, and research on American naval activity.

“We identified and disrupted an Iran-nexus threat actor that used Claude to collect and analyze publicly accessible data to develop targeting recommendations against US naval forces in the region,” the company said.

“We banned the actor’s account, developed detections to reduce the risk of future misuse, and shared threat intelligence with government authorities to disrupt the threat.”

I would like to note that this report comes shortly after a former Anthropic researcher, Jacob Coxon, made alarming claims that self-improving AI could doom humanity, conveniently arriving alongside a push for sweeping federal control. The “Killer AI” coverage came with synchronized warnings, a dramatic media rollout, advocacy funding, and a regulatory remedy that appears to be part of a coordinated effort by interested parties to frighten Congress into giving them influence over the industry’s rules.

However, at this point AI remains a tool. It is not a moral agent capable of hatred, mercy, or remorse.

When abused by people, however, it can accelerate the creation of instruments of death, from biological weapons to missiles and armed drones. Theoretically, it could be used to generate novel weapon systems yet undreamed of today.

In the end, responsibility rests with humanity to use this technology properly, and not with mindless electrons and equations that operate only on the instructions given to them.

And, if I have learned anything over the past 15 years of citizen activism, it’s that any regulations imposed will likely result in many unintended consequences…and most of those to the detriment of our country.

However, given the release of the novel coronavirus from the Wuhan Institute of Virology and the disaster of the COVID pandemic response, the researchers and institutions that used Anthropic for biological weapons research deserve extra scrutiny and, perhaps, should enjoy some of the other technologies the U.S. has on hand.

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