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Anthropic says new defences cut the data distillers take from Claude by about 90 to 99 per cent

See how this story connects

Source: Anthropic

Anthropic said new methods have reduced the amount of data harvested by distillers from Claude by around 90 to 99 per cent, with defences focused on making Claude’s reasoning transcripts harder to reach. It described distillation as covert, industrial-scale campaigns through networks of fraudulent accounts, said Zhipu distilled the cyber capabilities of leading US models while building GLM-5.3, and cited a case in which requests to Moonshot’s Kimi models were forwarded to Claude. Anthropic said it has turned away meaningful revenue and trillions of tokens of paying traffic from distillers, and that some changes required legitimate users to update their integrations.

Why it matters

Developers whose integrations read Claude’s reasoning may need changes, and labs that build on distilled outputs lose a cheap route to frontier capabilities.

When
12 Oct 2026
ID
WTA-N-2026-0409
Who
Anthropic, Zhipu AI, Moonshot AI
System
Claude (target of distillation)
Operator
distillers using networks of fraudulent accounts; Zhipu named
Type
industrial-scale distillation of model outputs
Status
defences in place; harvested data down about 90 to 99 per cent; disclosed by Anthropic · Incident ledger

Summary by wheresthe.ai, from Anthropic. Checked against the source on 24 Oct 2026.

Read the original at Anthropic

Source copy: download the page as saved on 24 Oct 2026 (PDF). Also held by the Internet Archive.

Earlier in this Storyline: What led hereAnthropic says Zhipu’s GLM-5.3 builds cyber exploits with safeguards easily bypassed

Cite this story

WTA-N-2026-0409: “Anthropic says new defences cut the data distillers take from Claude by about 90 to 99 per cent.” wheresthe.ai, 12 Oct 2026. https://wheresthe.ai/d/us-anthropic-says-new-defences-cut-distillation-of-claude-by-up-to-99-2026-10/ (source: Anthropic).

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