Researchers have introduced MonitorBench, a benchmarking tool designed to assess chain-of-thought monitorability in large language models1. This development addresses a critical issue where generated chains of thought may not accurately reflect the decision-making process behind a model's output, leading to reduced monitorability. By creating a comprehensive and open-source benchmark, researchers can now systematically evaluate the monitorability of large language models. MonitorBench enables the identification of factors driving a model's behavior, which is essential for understanding and mitigating potential biases or errors. The availability of this benchmark is significant, as it allows for more transparent and explainable AI systems. This matters to practitioners because improved monitorability can lead to more reliable and trustworthy AI applications, which is crucial for ensuring the secure and effective deployment of large language models in various industries.