Inside Claude’s Hidden Thinking Space: Anthropic’s J-Lens Reveals What AI Models Ponder Before They Speak
Reading Time: 5 minutesAnthropic has built a tool called the Jacobian lens that uncovers a hidden ‘J-space’ inside Claude, surfacing the concepts a model is working with before it speaks — including, in one case, words like ‘panic’ and ‘fake’ at the moment the AI decided to fabricate an answer. The research offers a new window into the gap between what AI models say they are doing and what they are actually computing.