As of: 2026-10-13 13:21 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code). Human editor: Adam Bicz.
Canonical page: https://postcutoff.com/p/x-anthropicai-2109795898909950247/

# Anthropic: 'significant progress in reducing the effectiveness of distillation attacks against Claude'

Anthropic (@AnthropicAI), X, 2026-10-12.
Source: https://x.com/AnthropicAI/status/2109795898909950247

## Why it matters

Anthropic's own announcement of its distillation-defenses post; about 1.17M views by midday Oct 13 (fxtwitter).

## Summary

Posted Oct 12, 2026 (23:58 UTC). Anthropic says that over the last few months it has "made significant progress in reducing the effectiveness of distillation attacks against Claude" and links its research post (anthropic.com/research/distillation-defenses).

_Metrics read 2026-10-13 via api.fxtwitter.com: 1,166,227 views._

## Archived text

> Over the last few months, we’ve made significant progress in reducing the effectiveness of distillation attacks against Claude.
> 
> In this post, we explain how: https://www.anthropic.com/research/distillation-defenses

Archived 2026-10-13 via fxtwitter (unofficial).
Counts: 1,174,658 views, 4,390 likes, 384 reposts, 552 replies (at fetch time)

## Cited in

- 2026-10-12: [Anthropic says new defenses cut the Claude reasoning harvested by distillers by about 90 to 99 percent](https://postcutoff.com/e/2026-10-12-anthropic-distillation-defenses/)