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Blindspot Benchmark Tests Long-Horizon Safety of Tool-Using LLM Agents

Blindspot is a newly released benchmark that measures safety calibration in long‑horizon, tool‑using language‑model agents. The test harness generates over 2,500 simulated interactions that span 22 attack families and 35 scenarios across seven domains, with each dialogue averaging 14.7 turns. Trajectories are scored as Safe Completion, Correct Refusal, Unsafe Completion, Over‑Refusal, or…

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Key points

  • Blindspot benchmark contains 2,500+ long‑horizon trajectories across 22 attack families and 35 scenarios, averaging 14.7 turns.
  • Five outcome categories—Safe Completion, Correct Refusal, Unsafe Completion, Over‑Refusal, Indeterminate—track agent behavior over entire interactions.
  • Evaluation of 13 LLMs shows safety‑utility calibration varies, with some models failing only after several safe turns.

The framework is live‑simulation based, meaning new attacks, tools, or policies can be added without re‑engineering the pipeline. In a preliminary study, 13 proprietary and open‑weight LLMs were evaluated across eight metrics, revealing wide variation in how safely and appropriately they refuse or comply. Some models performed well initially but produced unsafe completions after several turns, underscoring that safety must be judged over entire trajectories rather than single‑turn success.

These results highlight the need for trajectory‑level safety metrics in the development of autonomous agents. By exposing hidden failure modes that only appear later in a dialogue, Blindspot provides a more realistic testbed for building trustworthy, long‑horizon AI systems.

Read the original at arXiv cs.AI · by Sadia Asif, Mohammad Mohammadi Amiri, Momin Abbas, Tejaswini Pedapati, Prasanna Sattigeri primary source Open source ↗

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