"Time flies like an arrow. Fruit flies like a"

gp-treemap — LLM continuation density

Cell area is the joint probability that the LLM assigns to the prefix from the root token to that cell — i.e. P(prompt followed by these tokens). Sibling cells at any subtree sum to that subtree's joint probability; the entire treemap sums to 1.0.

At every internal node, a synthetic (other) leaf carries the residual mass that wasn't expanded — long-tail tokens dropped by --top-k / --top-p / --prune-probability all fold into it. The aggregates therefore reconcile exactly at every level.

Prompt

Time flies like an arrow. Fruit flies like a

Color modes

• probability: conditional p (given the parent) — Viridis.
• depth: depth from the root token — Viridis.
• token-rank: sibling rank (1 = most-likely sibling) — Viridis.
• surprisal: −log₂(conditional) — Viridis (higher = redder).
• leaf-reason: categorical — why the branch stopped expanding (max-depth / pruned / eos / other-bucket).

Mouse

• Hover: see decoded token + conditional p + joint p.
• Click a cell: select it; breadcrumb lights up.
• Scroll wheel on a selected cell: walk focus up/down the ancestor chain.
• Double-click: zoom into the cell.