Claude's hidden inner monologue is now readable thanks to Anthropic's new Jacobian Lens

Anthropic has developed a diagnostic tool called J-Lens that can interpret internal activation patterns, known as J-Space, within its Claude models. This feature functions as an emergent working memory, allowing researchers to observe how the AI processes information and identifies testing scenarios before it generates a response. This capability provides new insight into model behavior, potentially helping developers better understand how autonomous reasoning develops during training.