claude-opus-5-5 returned a playable pure-code coastal drone flyby on the first try — 458-line Three.js HTML, finish=stop, no truncation, code untouched.

prompt was our own: a fictional headland called "Cinder Spur" (layered cliffs, spit, turquoise shallows, wind-bent pines). no Hawaii names, no Na Pali, no real landmarks, no external textures. one parallel run on deepseek-v4.1-flash-1017 with the same instruction.

recorded 26s @ 1920x1080 with a virtual-clock / headless Chrome (SwiftShader) capture. Opus flew. DeepSeek also flew, with a more cliff-readable look after a long reasoning delay. thread has both, plus what broke.

ran through Keyo's API (http://keyoapi.xyz) on 2026-10-24. field note, not a remake of anyone's coast.