Model Releases
Anthropic says new measures like preserved thinking in Fable 5.1 and Opus 5.5 have reduced data harvesting through distillation attacks by about 90% to 99% (Anthropic)
Anthropic: Anthropic says new measures like preserved thinking in Fable 5.1 and Opus 5.5 have reduced data harvesting through distillation attacks by about 90% to 99% — In recent months, we've made su
Anthropic: Anthropic says new measures like preserved thinking in Fable 5.1 and Opus 5.5 have reduced data harvesting through distillation attacks by about 90% to 99% — In recent months, we've made substantial progress on reducing the effectiveness of distillation attacks on Claude using new methods, as we outline in this blog.
Related
- Anthropic details distillation efforts by Chinese companies, like Moonshot and DeepSeek, sending user queries to Claude via 'transfer stations' outside China (Wall Street Journal)
- Sources: Microsoft is restricting employees from using Claude Fable 5 because of Anthropic's new 30-day data retention requirements (Tom Warren/The Verge)
- Anthropic says red team tests of Fable 5 found no universal jailbreaks, and it will keep first- and third-party user traffic on Mythos-class models for 30 days (Derek B. Johnson/CyberScoop)
Source: Techmeme | 2026-10-12