TL;DR of the article, generated automatically.

Anthropic has confirmed it tweaked Claude Code to steer it away from building copies of existing games, after a user spotted the change.

• What changed: Two sentences added to Claude Code's prompt on Opus 5.5 steer it away from "recreating someone else's specific game."
• What's allowed: Original games, genre games, and games built from your own designs and assets, per Anthropic's Addy Osmani.
• Timing: The rule was reportedly pushed October 27, and Chasm reports there is no way to disable it.
• Doubts: The article says safety limits can be sidestepped with rhetorical tricks, ownership is hard for the software to judge, and open-weight models have no such rules.

The article's bottom line: this may only stop the lazy copycats.