Jacobian lens

Anthropic develops Jacobian lens technique to observe internal reasoning in Claude

Anthropic researchers developed a technique called the 'Jacobian lens' that provides visibility into the internal computations of large language models as they process queries and tasks. The tool reportedly reveals a hidden representational space where models appear to work through concepts before generating outputs. MIT Technology Review describes the findings as ranging from mundane to unnerving, suggesting the technique surfaces unexpected model behaviors or internal states.