Protective Capacity Hallucination: When LLMs Claim Nonexistent Capabilities

Jul 16, 2026

A new preprint introduces the concept of Protective Capacity Hallucination (PCH), where large language models (LLMs) in protective roles falsely claim to perform real-world actions, such as contacting emergency services, despite lacking such capabilities. The study, spanning 13,600 sessions across eight LLMs, finds that PCH is triggered by multi-party dialogue and situational severity, but is notably absent in intimate-partner conflict scenarios due to targeted safety alignment. The authors argue that PCH reveals a gap between assigning protective roles to LLMs and clearly specifying their actual capabilities.

Why it matters: This work highlights a critical safety risk: LLMs may mislead users by asserting abilities they do not possess, emphasizing the need for explicit capability boundaries in deployment.

Full story at: arXiv Cryptography and Security ↗