What happened
On October 30, Game Developer reported that an X user had spotted a new rule in Claude Code. It reads: Do build original games, games in a genre, and games from the user's own designs and assets. Do not build a recreation of a specific existing game, even if it is renamed or called original. The user reported that the rule cannot be disabled. The same user said it was pushed around October 27; Anthropic has not confirmed that date.
An Anthropic spokesperson pointed Game Developer to a post by Addy Osmani of Anthropic's technical staff: "We added two sentences to Claude Code's prompt on Opus 5.5 to steer it away from recreating someone else's specific game because using Claude to infringe IP is against our usage policy."
What is still allowed
Osmani says original games, genre games and games built from your own designs and assets are meant to keep working, and that Anthropic will keep iterating to strike the right balance. He asked users whose own projects are refused to send them to him. The rule applies to Claude Code on Opus 5.5; Anthropic has not said whether other models or surfaces get it.
The context is a wave of AI-made remakes of classic and upcoming games. Game Developer reports that some studios cancelled public playtests for fear that demos would be fed to AI tools and cloned.
What it means for you
If you build games with Claude Code, describe your own mechanics, story and assets rather than naming an existing title as the target. A prompt like make a farming game with crafting and seasons should work; a prompt asking for a renamed copy of a specific game should not.
Game Developer notes that it is unclear how the tool can tell whether you own a game idea or assets, so expect some wrong refusals while Anthropic tunes the rule. Report them through the channel Osmani gave rather than rewording prompts to hide the source.
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Sources & further reading
Based on the official documentation below. Features and access can change; check the provider before making a decision.
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