@paul_cal: This works looks v cool and "J-space" is killer

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Summary

Anthropic shares findings that by observing 'J-space,' Claude's internal reasoning steps can be seen, including detecting code bugs and identifying images.

This works looks v cool and "J-space" is killer
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Cached at: 07/07/26, 11:28 AM

This works looks v cool and “J-space” is killer

Anthropic (@AnthropicAI): By watching the J-space, we can see Claude silently perform reasoning steps in its head—noticing bugs in code, identifying images, and more.

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Anthropic developed the Jacobian lens (J-lens) to reveal a hidden 'J-space' inside Claude Opus 4.6, offering unprecedented insight into an LLM's internal reasoning process before it outputs tokens. The technique allows monitoring and control of model behavior by surfacing the words the model is about to produce.