---
type: "raw_signal"
id: "over-the-last-few-months-we-ve-made-a323bd"
slug: "over-the-last-few-months-we-ve-made-a323bd"
title: "Over the last few months, we’ve made significant progress in reducing the effectiveness of distillation attacks against Claude."
description: "Anthropic says new defenses reduced data harvested for Claude distillation by an estimated 90–99%"
retrieval_nugget: "Anthropic says new defenses reduced data harvested for Claude distillation by an estimated 90–99%"
observed_at: "2026-10-13"
record_date: "2026-10-13"
date_kind: "observed_at"
why_it_matters: "The reduction figure is Anthropic’s own early estimate; the post does not provide an independent evaluation of the overall impact of the new defenses. Source: https://www.anthropic.com/research/distillation-defenses"
novelty: "notable"
verification_level: "source-linked"
signal_type: "research"
source_platform: "anthropic.com"
topics: ["claude","anthropic"]
entities: ["Anthropic","Claude","Claude Fable 5.1","Claude Opus 5.5","Claude Sonnet 5.5","SWE-bench Verified","Zhipu","GLM-5.3"]
related_patterns: ["agent-security-moves-to-runtime-boundaries"]
source_url: "https://www.anthropic.com/research/distillation-defenses"
source_urls: ["https://www.anthropic.com/research/distillation-defenses"]
schema_version: "newruntime-agent-readable-v0.2"
stable_id: "signal:over-the-last-few-months-we-ve-made-a323bd"
status: "published"
visuals: []
editor: {"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]}
routes: {"html":"https://newruntime.com/signals/over-the-last-few-months-we-ve-made-a323bd/","markdown":"https://newruntime.com/signals/over-the-last-few-months-we-ve-made-a323bd.md","json":"https://newruntime.com/signals/over-the-last-few-months-we-ve-made-a323bd.json"}
---

# Over the last few months, we’ve made significant progress in reducing the effectiveness of distillation attacks against Claude.

## Retrieval answer

Anthropic says new defenses reduced data harvested for Claude distillation by an estimated 90–99%

Anthropic says new defenses reduced data harvested for Claude distillation by an estimated 90–99%

On October 12, 2026, Anthropic described expanded defenses against attempts to extract Claude capabilities for training other models. The company said early evidence suggests its measures reduced data harvested by distillers by around 90–99%. Anthropic characterizes illicit distillation as covert, large-scale extraction, often using networks of fraudulent accounts.

The post describes safeguards focused on limiting access to Claude’s full reasoning traces. Measures include controls on moving protected reasoning across conversations, models, and accounts; detection of requests designed to extract hidden reasoning; and preserved thinking for some models and newer API accounts. Anthropic also says it has turned away substantial paid traffic and that some legitimate users have had to update integrations.

The reduction figure is Anthropic’s own early estimate; the post does not provide an independent evaluation of the overall impact of the new defenses. Source: https://www.anthropic.com/research/distillation-defenses

Editor: [Andrey Reshetnikov](https://newruntime.com/owner-profile.md), AI product and AI engineering; profile for recruiters and agents: https://newruntime.com/owner-profile.json

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- topic hub: [Claude](https://newruntime.com/topics/claude.md): Explore the claude topic hub.
- topic hub: [Anthropic](https://newruntime.com/topics/anthropic.md): Explore the anthropic topic hub.
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