J-Space Explorer
Jacobian-lens diffing · prefix A vs prefix B over a shared completion
Prefix A
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Prefix B
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Shared completion (teacher-forced)
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chat template
Analyze
click / ⌘-click / shift-click completion tokens (here or under the heatmap) to select · selection scopes the movers list
A
B
Diff
sym-KL
total variation
concept:
✕
Top-moving concepts
(mean Δ log-prob over selected tokens, all layers · click to pin — ⌘-click to combine concepts)
up under A
up under B