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Slope chart showing interpretability visibility before and after the J-space discovery. Five behavior categories improve: task progress from 20 to 70, recognition from 10 to 60, commentary from 5 to 80, bias detection from 15 to 55, and cheating signals from 0 to 70. Illustrative values.

Anthropic J-space reveals LLM thoughts, but not fully

Anthropic's J-space exposes hidden words shaping LLM reasoning. Mechanistic interpretability advances, but misuse detection stays unproven.

Lars Cornelissen · Jul 14, 2026