Ensemble Monitoring for AI Control: Diverse Signals Outweigh More Compute

In three linesStudy showing diverse ensembles of monitors detect misaligned AI agent actions better than homogeneous ensembles. 12 GPT-4.1-Mini monitors (prompting + fine-tuning) evaluated on coding tasks: best 3-monitor ensemble achieves 2.4x greater detection gain versus identical-monitor ensemble, with strong generalization on independent data.

Summary generated by Claude — human-verified