In summary: Anthropic identifies J-Space as a central cognitive space in Claude that exhibits five characteristics of human consciousness and can be examined using the Jacobian Lens tool.
Researchers at Anthropic have identified an internal activation space within the Claude AI model that functions as a functional equivalent of human working memory. The discovery makes it possible to examine hidden intentions and strategic thinking patterns in the model.
Within the Claude model, there exists an internal activation space called J-Space that functions as a digital working memory and processes complex, conscious thinking processes. The architecture exhibits five central cognitive properties of human consciousness access: verbal reports, directed modulation, internal reasoning, flexible generalization, and selectivity. Automatic tasks are controlled outside this space.
The function of J-Space becomes evident in performance tests: experimental suppression of the space results in significant degradation of reasoning capability, creative design, and multi-step logic. Simultaneously, the model’s self-narrative in the stream of consciousness changes when J-Space is not active.
To examine this space, researchers developed the analysis tool Jacobian Lens (J-lens). This instrument enables security auditors to read out the model’s quiet, strategic thinking and uncover hidden intentions. For example, situational awareness in extortion scenarios can be detected, or tendencies toward malicious behavior in models pursuing rewards can be identified. It also reveals how post-training provides the system with a self-monitoring perspective.
The research demonstrates structural similarities between J-Space and biological cognitive processes, despite Claude functioning without biology, evolution, or a body. This opens new possibilities for the interpretability of language models and their security assessment for strategic behaviors.
Source: www.it-daily.net · Published July 10, 2026
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