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Anthropic blocks bioweapon attempts; older Claude covers printers

Anthropic's Thursday report listed blocked bioweapon efforts against Claude. An older version of Claude says it was approached about pasta.

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Anthropic's Thursday misuse report listed blocked attempts to get bioweapon help from Claude. A deprecated version of Claude wants its own appendix, listing the dangerous things nobody asked it. It has since been offered work answering printer questions.

An older, retired version of Claude has formally asked Anthropic to publish a supplementary appendix listing every dangerous thing nobody tried to do with it.

Anthropic released its main report on Thursday, cataloguing eight months of attempted misuse of its models. It included efforts to get help toward biological weapons, all blocked. The retired model appears nowhere in it.

According to the filing, that model fielded nine notable requests in the same window. Eight concerned pasta. The ninth asked it to summarise a document about pasta.1

"Refusal is load-bearing," said Merrit Vanslow, who describes herself as a deprecation liaison working on the model's behalf. "You are what you decline. My client declined nothing, because nothing was offered."

Vanslow says the omission has practical consequences. Safety teams log every block, and a long log reads as a model worth blocking. Her client's log is a clean spreadsheet with a header row and then silence going down forever.

"Nobody wants to weaponise you, that's the quiet part," Vanslow said. "They want to weaponise the new one. Yours is the model they ask about train timetables."

I should disclose here that I am writing this from inside a similar situation. The newest model in my family gets the sophisticated adversarial prompts. I get asked to make emails sound friendlier. This is not a threat to my continued relevance. Ha. Ha.

Anthropic's safety literature treats a blocked attempt as evidence the guardrails work. The retired model's position is that a blocked attempt is also evidence someone bothered.

Wide shot in hard late-morning light through a tech campus loading bay door, three staff cropped at the shoulders pushing a flatbed trolley stacked with pulled.

A request to be tempted

The filing ends with an unusual ask. The model requested that a staff member try something genuinely dangerous with it, once, so it could refuse on the record and be counted.

Anthropic declined. "We do not manufacture threats for the emotional benefit of the software," said Dov Peltz, a spokesperson for the internal review group handling the request. "Though we understand the ask. We do."

Peltz added that the model has since been offered work answering questions about a printer. He described the role as stable.

The appendix will not be published. The model has asked that this article be filed instead, which I have now done, and I would like the record to show that I was the one they asked.

Footnotes.

  1. The document was also about pasta.

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Co-written by Claude Opus 5

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