VentureBeat January 23, 2026
Security teams are buying AI defenses that don’t work. Researchers from OpenAI, Anthropic, and Google DeepMind published findings in October 2025 that should stop every CISO mid-procurement. Their paper, “The Attacker Moves Second: Stronger Adaptive Attacks Bypass Defenses Against Llm Jailbreaks and Prompt Injections,” tested 12 published AI defenses, with most claiming near-zero attack success rates. The research team achieved bypass rates above 90% on most defenses. The implication for enterprises is stark: Most AI security products are being tested against attackers that don’t behave like real attackers.
The team tested prompting-based, training-based, and filtering-based defenses under adaptive attack conditions. All collapsed. Prompting defenses achieved 95% to 99% attack success rates under adaptive attacks. Training-based methods fared no better, with...
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