Claude Opus 5.5 Regression Claims Face Mixed Evidence After Developer Retest

A developer's repeat run of a Claude Opus 5.5 game-building prompt has reignited claims that Anthropic's newest model has degraded since launch, but public benchmark trackers have not established a confirmed downgrade. The dispute centers on a one-shot Godot remake of Lander, the Acorn Archimedes 3D game associated with Elite creator David Braben, generated on September 23 and then attempted again on October 2 with the same prompt and two reference images.