Animated ink fish short compares per-turn billing of Opus 5.5 and Sonnet 5.5
The author made an animated short in which an ink fish rewrites Opus 5.5's "2x" price tag, comparing the per-turn cost of Opus and Sonnet 5.5.
we animated ink silverfish rewriting opus 5.5's "2x" price tag, for anyone running agents all day opus 5.5 vs sonnet 5.5, billed per turn. 2 pages, 4 price rows, 3 context sizes list price: opus is double on input, output, cache write long session: the bill grows in re-reading, same price on both re-read history -> write what's new -> output -> bill -> repeat on the spread: > cache read - $0.20 per 1M on both, the only equal row > re-reading - about 1/8 of a sonnet turn at 20K, about 3/4 at 400K > the gap - about 3 cents a turn at any size, about $2.88 per 100 turns 1.26x opus over sonnet per turn at 400K context. at 20K: 1.88x caveat: assumed turn (5,500 tokens written, 1,500 output), not real logs at 400K opus breaks even with 21% fewer turns ↓
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