Overview
- A developer flagged the change publicly and Anthropic confirmed it added a rule in Claude Code’s Opus 5.5 instance to discourage reproducing particular existing games.
- Anthropic said the safeguard was implemented by inserting two guiding lines into the model’s prompt templates rather than by retraining or altering the model itself.
- The company clarified that creators can still build original games, genre-style projects, or games that use the user’s own designs and assets.
- The developer reported the rule cannot be turned off, which suggests limited local configurability but Anthropic has not publicly detailed how user settings or admin controls are affected.
- The move shows a prompt-level approach to managing intellectual property risk and raises practical questions about enforcement, measurement, and whether the same rule will appear in other Claude models.