Ian McKenzie was a research engineer at FAR.AI until August 2025. Previously, Ian worked on building evaluations for frontier models with the Policy Research team at OpenAI and has an MSc in Artificial Intelligence from the University of Edinburgh.
We tested the effectiveness of "defense-in-depth" AI safety strategies, where multiple layers of filters are used to prevent AI models from generating harmful content. Our a new attack method, STACK, bypasses defenses layer-by-layer and achieved a 71% success rate on catastrophic risk scenarios where conventional attacks achieved 0% success against these multi-layered defenses.
We introduce a novel jailbreak benchmark focused on unambiguously harmful questions such as constructing chemical, biological, radiological and nuclear (CBRN) threats, available on HuggingFace. We have found it is more challenging for attacks to elicit harmful responses from models on this benchmark than existing jailbreak benchmarks like StrongREJECT, Do-Not-Answer and SORRY-Bench. In particular this dataset is especially useful to understand which attack methods pose the greatest risk of eliciting egregiously harmful responses.
While larger language models exhibit impressive capabilities, they remain vulnerable to adversarial prompts. Empirical findings show that robustness against such attacks significantly improves with adversarial training, but not with model scaling alone.
We tested the effectiveness of "defense-in-depth" AI safety strategies, where multiple layers of filters are used to prevent AI models from generating harmful content. Our a new attack method, STACK, bypasses defenses layer-by-layer and achieved a 71% success rate on catastrophic risk scenarios where conventional attacks achieved 0% success.