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Anthropic’s Opus 5 Is Better at Resisting Prompt Injection

26 · Bruce Schneier · July 31, 2026, 5:34 p.m.
AI cyberattack llm artificial-intelligence Machine Learning prompt injection AI model evaluation
Summary
The blog post discusses the improved performance of Anthropic’s Opus 5 model in resisting prompt injection attacks, showcasing its superiority over previous versions and competing models like GPT-5.6 variants, providing specific success rates for attempts at breaching security protocols.
Read full post on www.schneier.com →
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