Opus 5 adds numeric self-checks to the Boeing benchmark and outbuilds Fable

victormustar · x · 2026-07-25

The post argues that a comparison video makes it easier to see that Opus 5 produced a more detailed result than Fable on the Boeing benchmark.
The quoted benchmark notes that Fable 5 took 42 minutes and produced about 4 files / 1,000 lines, using a Puppeteer harness, 12 camera presets, 17 render passes, and 54 screenshot inspections.
Opus 5 took 71 minutes, but expanded the work to 20 modules / 4,000 lines and used a second tool, measure.mjs, to extract quantitative geometry from the running scene.
That tool measured 14 aircraft metrics — including span, wheelbase, wing root leading-edge station, sweep, dihedral, and gear track — and compared them against published 747-400 figures with per-metric tolerances.
The image and commentary together suggest Opus 5 does not just visually verify the scene; it tries to measure and self-check the generated output numerically.

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