Opus
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Paper Plane Atlas
One brief, two builds
A single page that teaches you to fold a paper dart, taught by a sheet of A4 that folds itself as you scroll — scroll position and animation time are the same number, so scrolling back up unfolds it. Two models were given the same brief and worked separately. Neither is a revision of the other and neither is the canonical one, so the interesting part is where they agree and where they diverge. Desktop only, by design in both.
Opus
Opus 5
Cool greys, non-photo blue. Valley and mountain told apart by line
style only.
Fable
Fable 5
Warm greys, valley red against mountain blue. Folds colour-coded as
well as dashed.
Token usage
Each build was written in one long agent session, and both transcripts were
exported with ccusage. Nearly every token in them is the same context being read
back again rather than anything new arriving, which is the headline figure in each column and the
reason counts this large carry costs this small. The four components below sum exactly to the
total; the figures are read from each build’s own export when this page loads.
Fable
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Cost is an estimated API-equivalent figure: ccusage prices cache reads at list rates, whereas the actual spend was subscription plan allowance — roughly 44–45% of the weekly limit for each.