Key Info

GMI Cloud used Claude Opus 5 in a 24-hour marathon session to create Sakura Crossing, an explorable Japanese town in blossom season, and has open-sourced it. They later found that Opus 5.5 built the same town in just 2 hours—12x faster—and at a higher quality.

Highlights

  • Sakura Crossing is a fully explorable Japanese town, open-sourced by GMI Cloud.
  • Opus 5 required a continuous 24-hour session to generate the town.
  • Opus 5.5 achieved the same result in 2 hours, a 12x speedup.
  • The output quality with Opus 5.5 is described as "on another level."