BABA-Bench paper (arXiv:2610.41076v1) introduces a 47-world benchmark for patient-advocacy LLM agents
BABA-Bench is a benchmark of 47 interactive worlds derived from de-identified real patient advocacy cases that checks both outcomes and procedural correctness (permissions, evidence, prohibitions) at each agent action. The authors evaluated 14 frontier models across 1,974 runs: agents often achieved required outcomes via invalid procedures (of 921 runs that reached all outcomes, 254 — 28% — failed procedural checks); Claude Opus 5 reached all required outcomes in 81.6% of runs but passed all checks in only 52.5% of runs, and providing verified routes dramatically improved pass rates for two models (from 29.8% to 91.5% and from 44.0% to 97.2%).