OpenAI proposes complementary observability metrics beyond g-mean²

OpenAI has introduced two complementary metrics alongside g-mean². The pair-matched metric compares observability only across instances supported by multiple models, while the post-control metric simulates deployment risks after a monitor rejects an output. The original text notes that g-mean² scores may be influenced by differing subsets of tasks supported by each model and do not reflect the actual effectiveness of monitors as control mechanisms during deployment.