Anthropic Confirms Claude Code Rule Against Recreating Existing Games

Anthropic staff member Addy Osmani said Friday, Oct. 30, that Claude Code’s Opus 5.5 instructions include a two-sentence safeguard to steer the model away from reproducing a particular existing title.

“Original games, genre games, and games built from your own designs and assets are meant to keep working,” Osmani wrote.

Anthropic confirmed the change in its coding product. The confirmation follows TokenPost’s earlier coverage of a Claude Code configuration that instructed the model not to recreate specific existing games. Osmani’s confirmation did not specify how the instruction applies to ports, mashups or authorized game projects.

Luke Street, maintainer of decomp.dev, separately said AI use had damaged the game-decompilation community as he announced the site was winding down. “The community aspect of decompilation has been broken,” Street said.

No figures quantify how widespread AI-assisted game copying is or whether Anthropic’s prompt change has reduced it.