Anthropic’s Opus 5 Is Better at Resisting Prompt Injection

· Bruce Schneier · July 31, 2026, 5:34 p.m.
AI reports 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.
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