Anthropic has changed how Claude Opus 5.5 behaves when someone asks it to copy a game. A new line in Claude Code's rules tells the model to build original games, genre games and games from the user's own designs, but not to recreate a specific existing game, even if it's renamed or called original.
The change was spotted by X user Chasm and later confirmed by Addy Osmani, a member of Anthropic's technical staff. Osmani said the company added two sentences to steer Claude away from recreating someone else's game, because using it to infringe IP breaks Anthropic's usage policy.
It lands in the middle of a messy stretch for Steam. Valve has admitted the store has an AI slop problem, and the most recent Steam Next Fest saw showcased demos roughly double, with AI-assisted games making up most of the jump. Some studios have reportedly pulled public demos out of fear their code will be reverse engineered and cloned.
Osmani also said original, genre and self-designed games should keep working, and that Anthropic will keep tuning the balance. If Claude refuses something that's genuinely yours, he asked people to send it his way.
